Composites Part A: Applied Science and Manufacturing最新文献

Quantitatively non-destructive detection for the laser-induced damage in ceramic matrix composite by using polarized laser scattering method 利用偏振激光散射法定量无损检测陶瓷基复合材料激光损伤

IF 8.2 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-10-14 DOI: 10.1016/j.compositesa.2026.110365

Jingfei Yin, Shengwei Song, Guanghua Yao, Jiuhua Xu

Ceramic matrix composites (CMCs) have emerged as ideal materials for next-generation aero-engine hot-section components due to their excellent high-temperature resistance and low density. However, the lack of effective non-destructive testing (NDT) methods for quantitatively evaluating laser–induced thermal damage in ceramic matrix composites (CMCs) poses a significant challenge for their reliable application in aero–engine hot components. To address this gap, this study develops a polarized laser scattering (PLS) detection system that exploits the sensitivity of polarized light to subsurface damage distributions. The developed method decouples surface scattering from subsurface scattering, enabling simultaneous detection of surface and subsurface laser-induced damage, including surface oxides, subsurface microcracks, interfacial gaps, and bubbles encapsulated within oxide layers, across scales from sub–micrometer to millimeter. The PLS approach is systematically validated against conventional characterization techniques and corroborated by in situ focused ion beam (FIB) cross–sectional imaging on a laser–machined CMC part. Quantitative comparison with destructive benchmarks yields an average relative error of 9 % for damage size determination, confirming the accuracy and practicality of the PLS method. This work establishes, for the first time, a quantitative NDT paradigm for laser–induced damage in CMC, providing a quantifiable tool for low–damage laser machining of film–cooling holes of CMCs.

陶瓷基复合材料因其优异的耐高温性能和低密度特性，已成为下一代航空发动机热截面部件的理想材料。然而，缺乏有效的无损检测（NDT）方法来定量评估陶瓷基复合材料（cmc）的激光热损伤，这对其在航空发动机热部件中的可靠应用构成了重大挑战。为了解决这一差距，本研究开发了一种偏振激光散射（PLS）检测系统，该系统利用偏振光对亚表面损伤分布的灵敏度。该方法将表面散射与亚表面散射分离开来，能够同时检测表面和亚表面激光引起的损伤，包括表面氧化物、亚表面微裂纹、界面间隙和氧化层内的气泡，范围从亚微米到毫米。PLS方法与传统表征技术进行了系统验证，并通过原位聚焦离子束（FIB）在激光加工CMC部件上的横截面成像得到了证实。与破坏性基准的定量比较产生的平均相对误差为9 %的损伤大小确定，确认PLS方法的准确性和实用性。本文首次建立了CMC激光诱导损伤的定量无损检测范式，为CMC薄膜冷却孔的低损伤激光加工提供了可量化的工具。

{"title":"Quantitatively non-destructive detection for the laser-induced damage in ceramic matrix composite by using polarized laser scattering method","authors":"Jingfei Yin, Shengwei Song, Guanghua Yao, Jiuhua Xu","doi":"10.1016/j.compositesa.2026.110365","DOIUrl":"10.1016/j.compositesa.2026.110365","url":null,"abstract":"<div><div>Ceramic matrix composites (CMCs) have emerged as ideal materials for next-generation aero-engine hot-section components due to their excellent high-temperature resistance and low density. However, the lack of effective non-destructive testing (NDT) methods for quantitatively evaluating laser–induced thermal damage in ceramic matrix composites (CMCs) poses a significant challenge for their reliable application in aero–engine hot components. To address this gap, this study develops a polarized laser scattering (PLS) detection system that exploits the sensitivity of polarized light to subsurface damage distributions. The developed method decouples surface scattering from subsurface scattering, enabling simultaneous detection of surface and subsurface laser-induced damage, including surface oxides, subsurface microcracks, interfacial gaps, and bubbles encapsulated within oxide layers, across scales from sub–micrometer to millimeter. The PLS approach is systematically validated against conventional characterization techniques and corroborated by in situ focused ion beam (FIB) cross–sectional imaging on a laser–machined CMC part. Quantitative comparison with destructive benchmarks yields an average relative error of 9 % for damage size determination, confirming the accuracy and practicality of the PLS method. This work establishes, for the first time, a quantitative NDT paradigm for laser–induced damage in CMC, providing a quantifiable tool for low–damage laser machining of film–cooling holes of CMCs.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"213 ","pages":"Article 110365"},"PeriodicalIF":8.2,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-stage deep learning for the modeling and prediction of fiber volume fraction in soft-hard hybrid braided preform during compaction process 基于两阶段深度学习的软硬混合编织预制体压实过程中纤维体积分数的建模与预测

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-05-25 DOI: 10.1016/j.compositesa.2026.109964

Baolong Mei, Jiuzhi Dong, Lipeng Xing, Rui Li, Xiuming Jiang

To improve the Fiber Volume Fraction (FVF) of carbon/carbon (C/C) composite soft-hard hybrid braided preforms and reduce the interlayer deviation of fiber content, the traditional single compaction process is optimized. To address this challenge, this paper proposes a two-stage deep learning architecture to enhance the prediction accuracy for preform FVF. In the first stage, a neural network is used to construct a multiple regression model (NNMR) that incorporates multiple process parameters. Based on an investigation into the compaction mechanism of preforms, the influence of multiple process parameters on the FVF is analyzed. Specifically, the NNMR is employed to learn the nonlinear relationships between these parameters and the preform FVF. For the second stage, a Nonlinear Model Predictive Control (NMPC) framework is employed, where the fitted process parameters serve as model inputs and the preform FVF as the model output. By constraining the target range, dynamic and refined adjustments are performed to obtain the optimal combination of process parameters. Notably, this method can overcome the limitations of traditional compaction methods and achieve efficient, accurate, and reliable prediction of preform FVF, thereby providing theoretical support for preform compaction processes.

为了提高碳/碳（C/C）复合软硬混合编织预制体的纤维体积分数（FVF），减小纤维含量的层间偏差，对传统的单一压实工艺进行了优化。为了解决这一挑战，本文提出了一种两阶段深度学习架构来提高预成形FVF的预测精度。在第一阶段，使用神经网络构建包含多个工艺参数的多元回归模型（NNMR）。在研究预成形件压实机理的基础上，分析了多个工艺参数对预成形件压实特性的影响。具体来说，利用核磁共振来学习这些参数与预成形FVF之间的非线性关系。对于第二阶段，采用非线性模型预测控制（NMPC）框架，其中拟合的过程参数作为模型输入，预成形FVF作为模型输出。通过约束目标范围，进行动态精细化调整，获得工艺参数的最优组合。值得注意的是，该方法克服了传统压实方法的局限性，实现了高效、准确、可靠的预成形FVF预测，为预成形压实工艺提供了理论支持。

{"title":"Two-stage deep learning for the modeling and prediction of fiber volume fraction in soft-hard hybrid braided preform during compaction process","authors":"Baolong Mei, Jiuzhi Dong, Lipeng Xing, Rui Li, Xiuming Jiang","doi":"10.1016/j.compositesa.2026.109964","DOIUrl":"10.1016/j.compositesa.2026.109964","url":null,"abstract":"<div><div>To improve the Fiber Volume Fraction (FVF) of carbon/carbon (C/C) composite soft-hard hybrid braided preforms and reduce the interlayer deviation of fiber content, the traditional single compaction process is optimized. To address this challenge, this paper proposes a two-stage deep learning architecture to enhance the prediction accuracy for preform FVF. In the first stage, a neural network is used to construct a multiple regression model (NNMR) that incorporates multiple process parameters. Based on an investigation into the compaction mechanism of preforms, the influence of multiple process parameters on the FVF is analyzed. Specifically, the NNMR is employed to learn the nonlinear relationships between these parameters and the preform FVF. For the second stage, a Nonlinear Model Predictive Control (NMPC) framework is employed, where the fitted process parameters serve as model inputs and the preform FVF as the model output. By constraining the target range, dynamic and refined adjustments are performed to obtain the optimal combination of process parameters. Notably, this method can overcome the limitations of traditional compaction methods and achieve efficient, accurate, and reliable prediction of preform FVF, thereby providing theoretical support for preform compaction processes.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"209 ","pages":"Article 109964"},"PeriodicalIF":8.1,"publicationDate":"2026-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148180437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of 3D printing path and continuous Flax yarn reinforcement on the performance of additively manufactured T-joints for large-scale components 3D打印路径和连续亚麻纱增强对大型零件增材制造t型接头性能的影响

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.compositesa.2026.109609

Natália V. dos Santos , K.Sales de Oliveira , T. Doca , Alberto Giubilini , Vitor F. de S. de Botton , Paolo Minetola , Mariana D. Banea , Daniel Carlos T. Cardoso

The design of optimized 3D printing paths is a key factor in improving the structural performance of continuous fiber-reinforced composites, especially for complex geometries are difficult to achieve using conventional manufacturing techniques. This study investigates the combined influence of continuous flax yarns as a bio-based reinforcement for Polylactic Acid and layer-wise printing path strategies on the mechanical response of printed components. Special emphasis is placed on T-joint configurations, which represent critical structural regions subjected to complex multi-axial stress states and govern load transfer and failure mechanism. Printing paths were specifically engineered to follow load-transfer directions, and intermediate reinforcement layers were introduced to enhance joint behavior. Experimental results demonstrate that both path optimization and continuous natural fiber reinforcement significantly improve the rotational response of the joints, leading to increased stiffness and moment capacity, as well as reduced brittleness and improved ductility when compared to unreinforced specimens. The results further indicate a synergistic interaction between adaptive path design and bio-based continuous yarn reinforcement, offering a viable route toward high-performance and sustainable continuous fiber-reinforced thermoplastic composites capable of sustaining complex loading conditions. In addition, a simplified bilinear model is proposed to describe the moment–rotation behavior of T-joint profiles, supporting structural interpretation and facilitating future numerical and design-oriented applications.

优化3D打印路径的设计是提高连续纤维增强复合材料结构性能的关键因素，特别是对于使用传统制造技术难以实现的复杂几何形状。本研究探讨了连续亚麻纱作为聚乳酸的生物基增强剂和分层印刷路径策略对印刷部件机械响应的综合影响。特别强调的是t形接头配置，它代表了受复杂多轴应力状态影响的关键结构区域，并控制着载荷传递和破坏机制。打印路径是专门设计的，以遵循载荷传递方向，并引入中间增强层，以提高接头的行为。实验结果表明，与未加筋试件相比，路径优化和连续天然纤维增强均显著改善了节点的转动响应，从而提高了节点的刚度和弯矩承载力，降低了脆性，提高了延性。研究结果进一步表明，自适应路径设计和生物基连续纱线增强之间存在协同作用，为实现能够承受复杂载荷条件的高性能和可持续的连续纤维增强热塑性复合材料提供了可行的途径。此外，提出了一种简化的双线性模型来描述t型接头的弯矩旋转行为，为结构解释提供支持，并为未来的数值和面向设计的应用提供便利。

{"title":"Influence of 3D printing path and continuous Flax yarn reinforcement on the performance of additively manufactured T-joints for large-scale components","authors":"Natália V. dos Santos , K.Sales de Oliveira , T. Doca , Alberto Giubilini , Vitor F. de S. de Botton , Paolo Minetola , Mariana D. Banea , Daniel Carlos T. Cardoso","doi":"10.1016/j.compositesa.2026.109609","DOIUrl":"10.1016/j.compositesa.2026.109609","url":null,"abstract":"<div><div>The design of optimized 3D printing paths is a key factor in improving the structural performance of continuous fiber-reinforced composites, especially for complex geometries are difficult to achieve using conventional manufacturing techniques. This study investigates the combined influence of continuous flax yarns as a bio-based reinforcement for Polylactic Acid and layer-wise printing path strategies on the mechanical response of printed components. Special emphasis is placed on T-joint configurations, which represent critical structural regions subjected to complex multi-axial stress states and govern load transfer and failure mechanism. Printing paths were specifically engineered to follow load-transfer directions, and intermediate reinforcement layers were introduced to enhance joint behavior. Experimental results demonstrate that both path optimization and continuous natural fiber reinforcement significantly improve the rotational response of the joints, leading to increased stiffness and moment capacity, as well as reduced brittleness and improved ductility when compared to unreinforced specimens. The results further indicate a synergistic interaction between adaptive path design and bio-based continuous yarn reinforcement, offering a viable route toward high-performance and sustainable continuous fiber-reinforced thermoplastic composites capable of sustaining complex loading conditions. In addition, a simplified bilinear model is proposed to describe the moment–rotation behavior of T-joint profiles, supporting structural interpretation and facilitating future numerical and design-oriented applications.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"204 ","pages":"Article 109609"},"PeriodicalIF":8.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrahigh-strength polybenzoxazine@polyimide nanofiber aerogels enabled by coaxial 1D building blocks via semi-crystalline structuring 超高强度polybenzoxazine@polyimide纳米纤维气凝胶是通过半晶体结构的同轴一维构建块实现的

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-05-01 Epub Date: 2026-01-27 DOI: 10.1016/j.compositesa.2026.109607

Xin Long , Longfei Li , Lichun Zhou , Yu Wang , Jubo Tang , Jianan Qin , Xiongbang Wei , Ying Lin , Peng Huang , Jiaxuan Liao

The performance drawback caused by low strength limits the independent application of aerogels in complex mechanical environments. To date, no effective method has been developed to optimize this property of aerogels without compromising other performance characteristics. Inspired by aerogel structural engineering design, we report a composite aerogel, named PBZ@PI-CA, which features a 1D building block with polyimide (PI) nanofiber as the endothecium, semi-crystalline polybenzoxazine (PBZ) as the periphery, and hydrophobic SiO₂ nanopowder (hydrophobic-260) discretely distributed on the outermost surface. A stable peptide bond connection is formed at the interface between the PBZ periphery and the PI nanofiber endothecium. This material exhibits numerous outstanding properties, including ultra-high strength, excellent deformability and elastic compressibility, excellent structural stability, remarkable lightweight high-strength characteristic, good thermal stability, high-efficiency thermal insulation, superhydrophobicity, and strong hydrophobic stability. The combination of these superior properties provides an attractive material system for thermal insulation and superhydrophobicity under complex mechanical environments.

低强度导致的性能缺陷限制了气凝胶在复杂机械环境中的独立应用。到目前为止，还没有一种有效的方法可以在不影响其他性能特性的情况下优化气凝胶的这种特性。受气凝胶结构工程设计的启发，我们报道了一种名为PBZ@PI-CA的复合气凝胶，其特征是聚酰亚胺（PI）纳米纤维为内膜，半晶聚苯并恶嗪（PBZ）为外围，疏水SiO2纳米粉末（疏水-260）离散分布在最外层。在PBZ外周和PI纳米纤维内膜之间的界面处形成了稳定的肽键连接。该材料具有超高强度、优异的变形性和弹性压缩性、优异的结构稳定性、显著的轻质高强特性、良好的热稳定性、高效隔热、超疏水性和强疏水稳定性。这些优越性能的结合为复杂机械环境下的隔热和超疏水性提供了一个有吸引力的材料体系。

{"title":"Ultrahigh-strength polybenzoxazine@polyimide nanofiber aerogels enabled by coaxial 1D building blocks via semi-crystalline structuring","authors":"Xin Long , Longfei Li , Lichun Zhou , Yu Wang , Jubo Tang , Jianan Qin , Xiongbang Wei , Ying Lin , Peng Huang , Jiaxuan Liao","doi":"10.1016/j.compositesa.2026.109607","DOIUrl":"10.1016/j.compositesa.2026.109607","url":null,"abstract":"<div><div>The performance drawback caused by low strength limits the independent application of aerogels in complex mechanical environments. To date, no effective method has been developed to optimize this property of aerogels without compromising other performance characteristics. Inspired by aerogel structural engineering design, we report a composite aerogel, named PBZ@PI-CA, which features a 1D building block with polyimide (PI) nanofiber as the endothecium, semi-crystalline polybenzoxazine (PBZ) as the periphery, and hydrophobic SiO<sub>2</sub> nanopowder (hydrophobic-260) discretely distributed on the outermost surface. A stable peptide bond connection is formed at the interface between the PBZ periphery and the PI nanofiber endothecium. This material exhibits numerous outstanding properties, including ultra-high strength, excellent deformability and elastic compressibility, excellent structural stability, remarkable lightweight high-strength characteristic, good thermal stability, high-efficiency thermal insulation, superhydrophobicity, and strong hydrophobic stability. The combination of these superior properties provides an attractive material system for thermal insulation and superhydrophobicity under complex mechanical environments.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"204 ","pages":"Article 109607"},"PeriodicalIF":8.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-impact marine antifouling HDPE composites based on synergistic covalent and ionic bonding with poly (hexamethylene guanidine) 基于聚六亚甲基胍协同共价键和离子键的高冲击船用防污HDPE复合材料

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.compositesa.2026.109576

Xiurong Hou , Jiaqi Wang , Ruihuan Wang , Sitong Zhang , Wenwen Yu , Jiangao Shi

The high-density polyethylene (HDPE)/ethylene–acrylic acid block copolymer (EAA)/poly (hexamethylene guanidine) (PHMG) composites with outstanding comprehensive properties were successfully fabricated through the synergistic design of covalent and ionic bonds with PHMG. Structural characterization confirmed the formation of amide bonds, while rheological and thermal analyses jointly demonstrated that the covalent bonded PHMG significantly enhanced molecular chain entanglement. This entanglement effect led to synergistic optimization of both tensile strength and toughness in this composite. Compared to pure HDPE, the HDPE/EAA/PHMG composites showed a slight decrease in tensile strength but a substantial 302 % surge in impact strength. Ionic bond modification of the composite material via PHMG solution immerse effectively enhanced its antibacterial properties, demonstrating good inhibitory effects against both E. coli and S. aureus. Furthermore, the modified material exhibits outstanding antifouling performance, reducing Chlorella attachment by 91.6 %. A three-month in marine test further validated its effective inhibition of algal growth. This research offers innovative material design concepts and technical pathways for developing high-performance marine antifouling materials that integrate significantly boosted toughness with outstanding antifouling performance.

通过共价键和离子键的协同设计，成功制备了具有优异综合性能的高密度聚乙烯(HDPE)/乙烯-丙烯酸嵌段共聚物(EAA)/聚六亚甲基胍（PHMG）复合材料。结构表征证实了酰胺键的形成，而流变学和热分析共同表明共价键PHMG显著增强了分子链纠缠。这种缠结效应导致复合材料的抗拉强度和韧性协同优化。与纯HDPE相比，HDPE/EAA/PHMG复合材料的抗拉强度略有下降，但冲击强度却大幅提高了302%。通过PHMG溶液浸泡对复合材料进行离子键改性，有效增强了复合材料的抗菌性能，对大肠杆菌和金黄色葡萄球菌均有良好的抑制效果。此外，改性材料具有良好的防污性能，使小球藻附着减少91.6%。为期三个月的海洋试验进一步验证了其对藻类生长的有效抑制作用。该研究为开发高性能海洋防污材料提供了创新的材料设计理念和技术途径，这些材料将显著提高韧性并具有出色的防污性能。

{"title":"High-impact marine antifouling HDPE composites based on synergistic covalent and ionic bonding with poly (hexamethylene guanidine)","authors":"Xiurong Hou , Jiaqi Wang , Ruihuan Wang , Sitong Zhang , Wenwen Yu , Jiangao Shi","doi":"10.1016/j.compositesa.2026.109576","DOIUrl":"10.1016/j.compositesa.2026.109576","url":null,"abstract":"<div><div>The high-density polyethylene (HDPE)/ethylene–acrylic acid block copolymer (EAA)/poly (hexamethylene guanidine) (PHMG) composites with outstanding comprehensive properties were successfully fabricated through the synergistic design of covalent and ionic bonds with PHMG. Structural characterization confirmed the formation of amide bonds, while rheological and thermal analyses jointly demonstrated that the covalent bonded PHMG significantly enhanced molecular chain entanglement. This entanglement effect led to synergistic optimization of both tensile strength and toughness in this composite. Compared to pure HDPE, the HDPE/EAA/PHMG composites showed a slight decrease in tensile strength but a substantial 302 % surge in impact strength. Ionic bond modification of the composite material via PHMG solution immerse effectively enhanced its antibacterial properties, demonstrating good inhibitory effects against both <em>E. coli</em> and <em>S. aureus</em>. Furthermore, the modified material exhibits outstanding antifouling performance, reducing <em>Chlorella</em> attachment by 91.6 %. A three-month in marine test further validated its effective inhibition of algal growth. This research offers innovative material design concepts and technical pathways for developing high-performance marine antifouling materials that integrate significantly boosted toughness with outstanding antifouling performance.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109576"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sodium alginate/polyacrylic acid/halloysite nanotube fibers fabricated by wet spinning for salinity gradient power generation 盐度梯度发电用海藻酸钠/聚丙烯酸/高岭土纳米管纤维的湿纺制备

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2026-01-10 DOI: 10.1016/j.compositesa.2026.109574

Yuqian Xu , Xiangyu Chen , Xinyuan Zhou , Ming Huang , Mingxian Liu

Ion transport through nanosized pores or channels can be used for salinity gradient power generation. In this study, sodium alginate/polyacrylic acid/halloysite nanotubes (SA/PAA/HNTs) composite fiber materials were fabricated using wet spinning technology via a shear-induced assembly strategy. The electrostatic repulsion among SA, PAA, and HNTs effectively prevented the close packing of molecular chains. Meanwhile, the applied shear force promoted the preferred alignment of HNTs along the fiber axis. This ordered arrangement imparts the fibers with pronounced birefringent optical properties. The hierarchical pore structure formed within the material offers efficient pathways for ion transport and significantly reduces ion migration resistance. By systematically adjusting the SA-to-PAA mass ratio (within 3:1 to 1:2), HNTs content (0–15 wt%), and spinning parameters (extrusion pressure from 5 to 120 psi), we achieved precise control over the fiber’s microstructure and overall performance. Notably, the unique hollow tubular structure of HNTs offers nanoscale channels for ion conduction, while the hydrophilic matrix formed by SA and PAA provides a favorable environment for ion dissolution and mobility. This multifunctional fiber, integrating optical responsiveness with enhanced ion transport, presents an innovative approach for developing smart textiles and next-generation salinity gradient energy harvesting systems.

离子通过纳米孔或通道传输可用于盐度梯度发电。本研究采用剪切诱导装配策略，采用湿纺丝技术制备了海藻酸钠/聚丙烯酸/高岭土纳米管（SA/PAA/HNTs）复合纤维材料。SA、PAA和HNTs之间的静电斥力有效地阻止了分子链的紧密排列。同时，施加的剪切力促进了hnt沿纤维轴的优先排列。这种有序的排列使光纤具有明显的双折射光学特性。材料内部形成的分层孔结构为离子输送提供了有效的途径，并显著降低了离子迁移阻力。通过系统地调整sa与paa的质量比（在3:1到1:2之间）、HNTs含量（0-15 wt%）和纺丝参数（挤出压力从5到120 psi），我们实现了对纤维微观结构和整体性能的精确控制。值得注意的是，HNTs独特的空心管状结构为离子传导提供了纳米级通道，而SA和PAA形成的亲水性基质为离子溶解和迁移提供了有利的环境。这种多功能光纤集成了光响应性和增强的离子传输，为开发智能纺织品和下一代盐度梯度能量收集系统提供了一种创新方法。

{"title":"Sodium alginate/polyacrylic acid/halloysite nanotube fibers fabricated by wet spinning for salinity gradient power generation","authors":"Yuqian Xu , Xiangyu Chen , Xinyuan Zhou , Ming Huang , Mingxian Liu","doi":"10.1016/j.compositesa.2026.109574","DOIUrl":"10.1016/j.compositesa.2026.109574","url":null,"abstract":"<div><div>Ion transport through nanosized pores or channels can be used for salinity gradient power generation. In this study, sodium alginate/polyacrylic acid/halloysite nanotubes (SA/PAA/HNTs) composite fiber materials were fabricated using wet spinning technology via a shear-induced assembly strategy. The electrostatic repulsion among SA, PAA, and HNTs effectively prevented the close packing of molecular chains. Meanwhile, the applied shear force promoted the preferred alignment of HNTs along the fiber axis. This ordered arrangement imparts the fibers with pronounced birefringent optical properties. The hierarchical pore structure formed within the material offers efficient pathways for ion transport and significantly reduces ion migration resistance. By systematically adjusting the SA-to-PAA mass ratio (within 3:1 to 1:2), HNTs content (0–15 wt%), and spinning parameters (extrusion pressure from 5 to 120 psi), we achieved precise control over the fiber’s microstructure and overall performance. Notably, the unique hollow tubular structure of HNTs offers nanoscale channels for ion conduction, while the hydrophilic matrix formed by SA and PAA provides a favorable environment for ion dissolution and mobility. This multifunctional fiber, integrating optical responsiveness with enhanced ion transport, presents an innovative approach for developing smart textiles and next-generation salinity gradient energy harvesting systems.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109574"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversible interfacial chemistry enables closed-loop recycling and highly thermal conductivity of EPDM/waste rubber composites 可逆界面化学使EPDM/废橡胶复合材料的闭环回收和高导热性成为可能

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.compositesa.2026.109562

Hongmin Sun , Xu Han , Dewang Hou , Kai Zheng , Yuze Xu , Chunlin Li , Ruiguang Li , Chengjie Li

Elastic thermal interface materials (TIMs) are essential for electronics thermal management, yet conventional elastomers struggle to achieve high thermal conductivity at low filler loadings while retaining recyclability. Concurrently, high-value upcycling of waste rubber powder (WRP) remains challenging. Herein, a sustainable, highly thermal conductive ethylene-propylene-diene monomer (EPDM)-IA/PA@Al₂O₃/WRP/CNTs TIM with closed-loop physical/chemical recyclability was engineered through dynamic interfacial chemistry and multiscale thermal conductive pathways. Esterification formed dynamic β-carboxy ester bonds between phytic acid-modified alumina (PA@Al₂O₃) and itaconic anhydride-functionalized EPDM (EPDM-IA), while Zn²⁺ coordination interacted with ring-opened anhydride groups to form supramolecular linkages. Incorporation of CNTs to bridge PA@Al₂O₃ established nanoscale heat transfer network, and utilization of WRP to promote macroscopic thermal pathways via volume exclusion. The optimized composite achieved an exceptional thermal conductivity of 2.2 W/m·K, meanwhile exhibiting excellent thermal aging resistance, mechanical/thermal conduction property retention, rapid temperature response and efficient photothermal conversion, significantly reducing CPU operating temperature. This work establishes a paradigm for designing sustainable TIMs through synergistic dynamic bonding and multi-scale thermal pathway engineering, simultaneously advancing electronics heat dissipation and high-value WRP upcycling.

弹性热界面材料（TIMs）对于电子产品的热管理至关重要，但传统弹性体难以在低填充量下实现高导热性，同时保持可回收性。与此同时，废胶粉（WRP）的高价值升级回收仍然具有挑战性。本文通过动态界面化学和多尺度导热途径，设计了一种具有闭环物理/化学可循环性的可持续高导热乙丙二烯单体(EPDM)-IA/PA@Al2O3/WRP/CNTs TIM。植酸修饰氧化铝（PA@Al2O3）与衣壳酸酐功能化EPDM （EPDM- ia）之间的酯化反应形成了动态的β-羧基酯键，而Zn2+配位与开环酸酐基团相互作用形成超分子键。CNTs作为桥接PA@Al2O3建立了纳米尺度的传热网络，并利用WRP通过体积排斥促进宏观热途径。优化后的复合材料导热系数为2.2 W/m·K，同时具有优异的热老化性能、机械/热传导性能、快速的温度响应和高效的光热转换，显著降低了CPU的工作温度。该研究为通过协同动态键合和多尺度热路径工程设计可持续TIMs建立了一个范例，同时推进了电子散热和高价值WRP升级回收。

{"title":"Reversible interfacial chemistry enables closed-loop recycling and highly thermal conductivity of EPDM/waste rubber composites","authors":"Hongmin Sun , Xu Han , Dewang Hou , Kai Zheng , Yuze Xu , Chunlin Li , Ruiguang Li , Chengjie Li","doi":"10.1016/j.compositesa.2026.109562","DOIUrl":"10.1016/j.compositesa.2026.109562","url":null,"abstract":"<div><div>Elastic thermal interface materials (TIMs) are essential for electronics thermal management, yet conventional elastomers struggle to achieve high thermal conductivity at low filler loadings while retaining recyclability. Concurrently, high-value upcycling of waste rubber powder (WRP) remains challenging. Herein, a sustainable, highly thermal conductive ethylene-propylene-diene monomer (EPDM)-IA/PA@Al<sub>2</sub>O<sub>3</sub>/WRP/CNTs TIM with closed-loop physical/chemical recyclability was engineered through dynamic interfacial chemistry and multiscale thermal conductive pathways. Esterification formed dynamic β-carboxy ester bonds between phytic acid-modified alumina (PA@Al<sub>2</sub>O<sub>3</sub>) and itaconic anhydride-functionalized EPDM (EPDM-IA), while Zn<sup>2+</sup> coordination interacted with ring-opened anhydride groups to form supramolecular linkages. Incorporation of CNTs to bridge PA@Al<sub>2</sub>O<sub>3</sub> established nanoscale heat transfer network, and utilization of WRP to promote macroscopic thermal pathways via volume exclusion. The optimized composite achieved an exceptional thermal conductivity of 2.2 W/m·K, meanwhile exhibiting excellent thermal aging resistance, mechanical/thermal conduction property retention, rapid temperature response and efficient photothermal conversion, significantly reducing CPU operating temperature. This work establishes a paradigm for designing sustainable TIMs through synergistic dynamic bonding and multi-scale thermal pathway engineering, simultaneously advancing electronics heat dissipation and high-value WRP upcycling.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109562"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multifunctional carbon nanotube@expanded graphite/polydimethylsiloxane composites with exceptional electromagnetic interference shielding and thermal management capability 多功能碳nanotube@expanded石墨/聚二甲基硅氧烷复合材料具有卓越的电磁干扰屏蔽和热管理能力

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.compositesa.2026.109563

Zifu Zhu , Dan Liu , Tianzeng Hong , Jie Xue , Chuanbing Li , Yuxuan Sun , Xiaobo Gao , Qingbin Zheng

Multifunctional electromagnetic interference (EMI) shielding composites with integrated thermal management capability are in high demand for modern electronic devices. However, porous-structured EMI shielding materials inherently exhibit poor thermal conductivities. Herein, a carbon nanotube (CNT)@expanded graphite (EG)/polydimethylsiloxane (PDMS) composite with both excellent EMI shielding and thermal management performance is designed and fabricated by integrating CNT networks into the EG framework via chemical vapor deposition (CVD), followed by PDMS infiltration. Based on the hierarchical porous architecture and three-dimensional (3D) electrically conductive network, the CNT@EG/PDMS composite exhibits ultrahigh EMI shielding effectiveness (SE) in the X-band (8.2–12.4 GHz) along both vertical (79.1 dB) and horizontal (61.7 dB) directions. Concurrently, due to the formation of a 3D thermally conductive network, the CNT@EG/PDMS achieves impressive in-plane (11.64 W·m⁻¹·K⁻¹) and out-of-plane (1.31 W·m⁻¹·K⁻¹) thermal conductivities (TC) at a CNT@EG loading of 18.7 wt%. Additionally, when subjected to a 1.5 V voltage, the CNT@EG/PDMS composite exhibits rapid and efficient Joule heating, achieving a high temperature of 98.6 °C within 30 s. The newly designed CNT@EG/PDMS composites with superior EMI SE, TC and Joule heating provide new insights into the design of highly integrated electronic materials for next-generation EMI shielding and thermal management.

具有综合热管理能力的多功能电磁干扰屏蔽复合材料在现代电子器件中有着很高的需求。然而，多孔结构的电磁干扰屏蔽材料固有地表现出较差的导热性。本文通过化学气相沉积（CVD）将碳纳米管（CNT）网络集成到膨胀石墨(EG)/聚二甲基硅氧烷（PDMS）框架中，然后通过PDMS渗透，设计和制造了具有优异EMI屏蔽和热管理性能的碳纳米管（CNT）@膨胀石墨(EG)/聚二甲基硅氧烷（PDMS）复合材料。基于分层多孔结构和三维（3D）导电网络，CNT@EG/PDMS复合材料在垂直（79.1 dB）和水平（61.7 dB）方向的x波段（8.2-12.4 GHz）具有超高的电磁干扰屏蔽效能（SE）。同时，由于三维导热网络的形成，CNT@EG/PDMS在CNT@EG负载为18.7 wt%时获得了令人印象深刻的面内（11.64 W·m−1·K−1）和面外（1.31 W·m−1·K−1）导热系数（TC）。此外，当受到1.5 V电压时，CNT@EG/PDMS复合材料表现出快速有效的焦耳加热，在30秒内达到98.6°C的高温。新设计的CNT@EG/PDMS复合材料具有卓越的EMI SE， TC和焦耳加热，为下一代EMI屏蔽和热管理的高度集成电子材料的设计提供了新的见解。

{"title":"Multifunctional carbon nanotube@expanded graphite/polydimethylsiloxane composites with exceptional electromagnetic interference shielding and thermal management capability","authors":"Zifu Zhu , Dan Liu , Tianzeng Hong , Jie Xue , Chuanbing Li , Yuxuan Sun , Xiaobo Gao , Qingbin Zheng","doi":"10.1016/j.compositesa.2026.109563","DOIUrl":"10.1016/j.compositesa.2026.109563","url":null,"abstract":"<div><div>Multifunctional electromagnetic interference (EMI) shielding composites with integrated thermal management capability are in high demand for modern electronic devices. However, porous-structured EMI shielding materials inherently exhibit poor thermal conductivities. Herein, a carbon nanotube (CNT)@expanded graphite (EG)/polydimethylsiloxane (PDMS) composite with both excellent EMI shielding and thermal management performance is designed and fabricated by integrating CNT networks into the EG framework <em>via</em> chemical vapor deposition (CVD), followed by PDMS infiltration. Based on the hierarchical porous architecture and three-dimensional (3D) electrically conductive network, the CNT@EG/PDMS composite exhibits ultrahigh EMI shielding effectiveness (<em>SE</em>) in the X-band (8.2–12.4 GHz) along both vertical (79.1 dB) and horizontal (61.7 dB) directions. Concurrently, due to the formation of a 3D thermally conductive network, the CNT@EG/PDMS achieves impressive in-plane (11.64 W·m<sup>−1</sup>·K<sup>−1</sup>) and out-of-plane (1.31 W·m<sup>−1</sup>·K<sup>−1</sup>) thermal conductivities (TC) at a CNT@EG loading of 18.7 wt%. Additionally, when subjected to a 1.5 V voltage, the CNT@EG/PDMS composite exhibits rapid and efficient Joule heating, achieving a high temperature of 98.6 °C within 30 s. The newly designed CNT@EG/PDMS composites with superior EMI <em>SE</em>, TC and Joule heating provide new insights into the design of highly integrated electronic materials for next-generation EMI shielding and thermal management.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109563"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the informed isotropic (IISO) viscosity model for compression molding of discontinuous fiber reinforced polymers 不连续纤维增强聚合物压缩成型的通知各向同性（IISO）粘度模型的评价

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.compositesa.2025.109552

Louis Schreyer, Constantin Krauß, Florian Wittemann, Luise Kärger

The informed isotropic (IISO) viscosity model has gained popularity as a surrogate for fourth-order tensor viscosity models in simulating injection and compression molding of discontinuous fiber reinforced composites in industrial applications, primarily to overcome numerical challenges that are especially pronounced in long fiber reinforced materials. In addition, the IISO model can be easily integrated into (commercial) isotropic frameworks. The central idea is to equate the energy dissipation rates resulting from a fully anisotropic and an isotropic viscous material model, which allows deriving a scalar surrogate viscosity that depends on the local fiber orientation. However, the model’s fundamental capability to predict anisotropic flow behavior in compression molding remains limited. This work comprehensively assesses the IISO viscosity model’s capabilities through analytical and numerical investigations of fundamental flow scenarios. We demonstrate that the IISO viscosity model cannot generate elliptical deformation in lubricated squeeze flow of initially cylindrical samples with spatially homogeneous and anisotropic initial fiber orientation states, confirming the model’s inherent limitation due to stress–strain-rate coaxiality. When we extend the analysis to non-lubricated squeeze flow, the results emphasize that the IISO viscosity model also fails to produce anisotropic flow regardless of the spatially homogeneous and (aligned) orthotropic initial fiber orientation state. Furthermore, we demonstrate that the compression-molding-style center-gated disk benchmark is inconclusive, as the flow trajectory depends on the magnitude of the imposed perturbation rather than the fiber orientation. The perturbation also introduces a physically implausible circumferential vortex. Finally, we discuss potential sources of apparent anisotropic behavior in numerical flow simulations in the literature and highlight the challenges of parameterizing the IISO viscosity model experimentally.

信息各向同性（IISO）粘度模型作为四阶张量粘度模型的替代品，在工业应用中模拟不连续纤维增强复合材料的注射和压缩成型，主要是为了克服在长纤维增强材料中特别明显的数值挑战。此外，IISO模型可以很容易地集成到（商业的）各向同性框架中。中心思想是将完全各向异性和各向同性粘性材料模型产生的能量耗散率等同起来，从而可以推导出依赖于局部纤维取向的标量替代粘度。然而，该模型预测压缩成型中各向异性流动行为的基本能力仍然有限。这项工作通过对基本流动情景的分析和数值研究，全面评估了IISO粘度模型的能力。我们证明了IISO粘度模型在具有空间均匀和各向异性初始纤维取向状态的初始圆柱形样品的润滑挤压流动中不能产生椭圆变形，证实了该模型由于应力-应变率同轴性而固有的局限性。当我们将分析扩展到非润滑挤压流动时，结果强调IISO粘度模型也不能产生各向异性流动，无论空间均匀和（排列）正交异性初始纤维取向状态如何。此外，我们证明了压缩成型式中心门控盘基准是不确定的，因为流动轨迹取决于施加扰动的大小而不是纤维方向。扰动还引入了物理上难以置信的周向涡。最后，我们讨论了文献中数值流动模拟中表观各向异性行为的潜在来源，并强调了实验参数化IISO粘度模型的挑战。

{"title":"Evaluation of the informed isotropic (IISO) viscosity model for compression molding of discontinuous fiber reinforced polymers","authors":"Louis Schreyer, Constantin Krauß, Florian Wittemann, Luise Kärger","doi":"10.1016/j.compositesa.2025.109552","DOIUrl":"10.1016/j.compositesa.2025.109552","url":null,"abstract":"<div><div>The informed isotropic (IISO) viscosity model has gained popularity as a surrogate for fourth-order tensor viscosity models in simulating injection and compression molding of discontinuous fiber reinforced composites in industrial applications, primarily to overcome numerical challenges that are especially pronounced in long fiber reinforced materials. In addition, the IISO model can be easily integrated into (commercial) isotropic frameworks. The central idea is to equate the energy dissipation rates resulting from a fully anisotropic and an isotropic viscous material model, which allows deriving a scalar surrogate viscosity that depends on the local fiber orientation. However, the model’s fundamental capability to predict anisotropic flow behavior in compression molding remains limited. This work comprehensively assesses the IISO viscosity model’s capabilities through analytical and numerical investigations of fundamental flow scenarios. We demonstrate that the IISO viscosity model cannot generate elliptical deformation in lubricated squeeze flow of initially cylindrical samples with spatially homogeneous and anisotropic initial fiber orientation states, confirming the model’s inherent limitation due to stress–strain-rate coaxiality. When we extend the analysis to non-lubricated squeeze flow, the results emphasize that the IISO viscosity model also fails to produce anisotropic flow regardless of the spatially homogeneous and (aligned) orthotropic initial fiber orientation state. Furthermore, we demonstrate that the compression-molding-style center-gated disk benchmark is inconclusive, as the flow trajectory depends on the magnitude of the imposed perturbation rather than the fiber orientation. The perturbation also introduces a physically implausible circumferential vortex. Finally, we discuss potential sources of apparent anisotropic behavior in numerical flow simulations in the literature and highlight the challenges of parameterizing the IISO viscosity model experimentally.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109552"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A dual-stage analytical model for FRPs drilling considering step structure 考虑阶梯结构的frp钻井双阶段分析模型

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing

Pub Date : 2026-04-01 Epub Date: 2025-12-29 DOI: 10.1016/j.compositesa.2025.109544

Jie Xu , Pingfa Feng , Huanhong Lin , Chun Liu , Haibo Bi , Feng Feng

This study investigates the influence of the step drill geometric characteristics on critical thrust force (CTF) using an analytical modeling. The study is motivated by the fact that step drill has proven to minimise delamination phenomena in comparison to twist drills. However, the existing CTF analytical models predominantly focus on the discussion of single-stage load mode based on twist drills. In contrast, the inherent two-stage geometry of step drills exhibits different material removal mechanisms and load distributions. Single-stage analysis is evidently inapplicable. To fill this gap, a dual-stage analytical model is developed that explicitly accounts for the local cutting mechanism and load contributions in each stage. The model incorporates critical geometric characteristic of step drills (e.g., the front-section point angle, transition angle, front-section radius, and shank radius). By comparison with existing models, the dual-stage analytical model demonstrates superior accuracy in CTF evolution throughout step drilling. Across the two stages, deviations from experimental measurements are 13.6% and 15.4%, respectively, representing a substantial improvement over exiting model, which exhibits deviations exceeding 150% under varying geometric parameters. In addition, as key factor, increasing the front-section point angle from 90° to 120° reduces the CTF by approximately 10%. These findings enhance the theoretical understanding of the geometric characteristics of step drills and highlight the necessity of a consideration of two stages.

采用解析模型研究了阶梯钻的几何特性对临界推力的影响。这项研究的动机是，与麻花钻相比，阶梯钻已被证明可以最大限度地减少分层现象。然而，现有CTF分析模型主要侧重于基于麻花钻的单级载荷模式的讨论。相反，阶梯钻头固有的两阶段几何结构表现出不同的材料去除机制和载荷分布。单级分析显然是不适用的。为了填补这一空白，开发了一种双阶段分析模型，明确地说明了每个阶段的局部切削机制和载荷贡献。该模型结合了阶跃钻头的关键几何特性（如前段点角、过渡角、前段半径和刀柄半径）。通过与现有模型的比较，双级分析模型在整个阶梯钻进过程中CTF演化的准确性更高。在两个阶段中，与实验测量值的偏差分别为13.6%和15.4%，比现有模型有了很大的改进，在不同几何参数下，现有模型的偏差超过150%。此外，作为关键因素，将前截面点角从90°增加到120°可使CTF降低约10%。这些发现增强了对阶梯钻的几何特征的理论认识，并强调了考虑两个阶段的必要性。

{"title":"A dual-stage analytical model for FRPs drilling considering step structure","authors":"Jie Xu , Pingfa Feng , Huanhong Lin , Chun Liu , Haibo Bi , Feng Feng","doi":"10.1016/j.compositesa.2025.109544","DOIUrl":"10.1016/j.compositesa.2025.109544","url":null,"abstract":"<div><div>This study investigates the influence of the step drill geometric characteristics on critical thrust force (CTF) using an analytical modeling. The study is motivated by the fact that step drill has proven to minimise delamination phenomena in comparison to twist drills. However, the existing CTF analytical models predominantly focus on the discussion of single-stage load mode based on twist drills. In contrast, the inherent two-stage geometry of step drills exhibits different material removal mechanisms and load distributions. Single-stage analysis is evidently inapplicable. To fill this gap, a dual-stage analytical model is developed that explicitly accounts for the local cutting mechanism and load contributions in each stage. The model incorporates critical geometric characteristic of step drills (e.g., the front-section point angle, transition angle, front-section radius, and shank radius). By comparison with existing models, the dual-stage analytical model demonstrates superior accuracy in CTF evolution throughout step drilling. Across the two stages, deviations from experimental measurements are 13.6% and 15.4%, respectively, representing a substantial improvement over exiting model, which exhibits deviations exceeding 150% under varying geometric parameters. In addition, as key factor, increasing the front-section point angle from 90° to 120° reduces the CTF by approximately 10%. These findings enhance the theoretical understanding of the geometric characteristics of step drills and highlight the necessity of a consideration of two stages.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"203 ","pages":"Article 109544"},"PeriodicalIF":8.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0