Composite Structures最新文献

Configurational stability analysis of multilayered plates under residual stress 残余应力作用下多层板的构型稳定性分析

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-08 DOI: 10.1016/j.compstruct.2026.120969

Zaoxu Zhang, Bohan Li, Jiaming Guo, Changguo Wang

This study presents a higher-order nonlinear computational framework, implemented as a user element (UEL) subroutine in ABAQUS, for analyzing residual stress-induced configurational instability in multilayered plates. By integrating three-dimensional displacement field, higher-order plate theories, and process-induced eigenstrain model within the Carrera Unified Formulation, this framework eliminates the ad hoc approximations of a linear through-thickness displacement distribution inherent to classical approaches. Comparison with experimental results and solid element solutions for the stable configurations of cross-ply laminates validates the predictive accuracy of different plate theories, while their computational costs are also discussed. We thoroughly investigate the equilibrium paths of cross-ply laminates and film/substrate systems to compare classical plate theory with the proposed framework. Numerical results demonstrate that higher-order theories outperform linear theories in predicting bifurcation thresholds and post-bifurcation configurations. By enriching the degrees of freedom through the thickness direction, higher-order Equivalent Single Layer and Layer-Wise theories provide a more accurate characterization of through-thickness displacement distributions—particularly for thin film/substrate systems. Besides, higher-order plate theories reveal that in-plane geometric asymmetry leads to unequal strain energy in post-bifurcation configurations, a phenomenon that linear theory fails to capture. The transverse residual stress predicted by higher-order theories also aligns more closely with the

C_{z}^{0}

requirement. This work delivers a robust computational framework that significantly enhances the analysis capability for residual stress-driven instabilities, offering valuable insights for the design and analysis of multi-stable plates.

本研究提出了一个高阶非线性计算框架，在ABAQUS中作为用户单元（UEL）子程序实现，用于分析多层板中残余应力引起的构型不稳定性。通过在Carrera统一公式中整合三维位移场、高阶板块理论和过程诱发的特征应变模型，该框架消除了经典方法固有的线性全厚度位移分布的临时近似。通过与实验结果和实元解的比较，验证了不同板理论的预测精度，并对其计算成本进行了讨论。我们深入研究了交叉层合板和薄膜/衬底系统的平衡路径，并将经典板理论与所提出的框架进行了比较。数值结果表明，高阶理论在预测分岔阈值和分岔后构型方面优于线性理论。通过丰富厚度方向上的自由度，高阶等效单层和分层理论提供了更准确的厚度位移分布特征-特别是对于薄膜/衬底系统。此外，高阶板理论揭示了平面内几何不对称导致分岔后构型的应变能不等，这是线性理论无法捕捉的现象。高阶理论预测的横向残余应力也更接近于Cz0要求。这项工作提供了一个强大的计算框架，显着提高了残余应力驱动不稳定性的分析能力，为多稳定板的设计和分析提供了有价值的见解。

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引用次数: 0

Micro-meso stress shielding mechanism in thermal-compensated polymer-bonded explosives 热补偿聚合物粘结炸药微细观应力屏蔽机理研究

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-28 DOI: 10.1016/j.compstruct.2026.120936

Chao Li, Weidong Wu, Jian-Li Shao, Ye Yuan, Pengwan Chen

TATB-based polymer-bonded explosives (PBXs) suffer from macroscopic dimensional instability and interfacial damage under extreme cooling, primarily driven by severe thermo-mechanical mismatch among constituents. Negative thermal expansion fillers can mitigate thermal deformation, but concurrent matrix stiffening alters the internal thermal stress state. To elucidate the underlying cross-scale micromechanical mechanisms, this study establishes a micro-meso hierarchical computational framework. A microscopic representative volume element model first screens the ZrW₂O₈-modified binder formulation using a Hasselman-based qualitative thermal-stress indicator. The homogenized parameters are then mapped onto a mesoscopic Voronoi-PBX model with 95.5 vol% solid loading to investigate thermo-mechanical response under extreme cooling. Results show that increasing ZrW₂O₈ content reduces the relative thermal-stress tendency via volumetric compensation. The 20 vol% modification achieves a CTE reduction of up to ∼ 50% with a ∼ 40% increase in modulus. More importantly, contrary to the common belief that stiffening inevitably increases thermal stress, mesoscale simulations reveal that the stiffened low-CTE binder forms a reinforced stress-transfer network, producing a stress-shielding mechanism that attenuates crystal stress concentrations. This mechanism may provide useful insight for designing thermally adaptive energetic composites.

基于tatb的聚合物粘结炸药（PBXs）在极端冷却条件下存在宏观尺寸不稳定性和界面损伤，这主要是由组分之间严重的热-机械失配驱动的。负热膨胀填料可以缓解热变形，但同时增强基体会改变内部热应力状态。为了阐明潜在的跨尺度微力学机制，本研究建立了一个微-中观层次计算框架。微观代表性体积元模型首先使用基于hasselman的定性热应力指标筛选zrw2o8改性粘结剂配方。然后将均匀化的参数映射到具有95.5 vol%固体负载的介观Voronoi-PBX模型上，以研究极端冷却下的热机械响应。结果表明，ZrW2O8含量的增加通过体积补偿降低了相对热应力趋势。20 vol%的改性使CTE降低了50%，模量增加了40%。更重要的是，与硬化不可避免地增加热应力的普遍观点相反，中尺度模拟显示，硬化的低cte粘结剂形成了增强的应力传递网络，产生了应力屏蔽机制，从而减弱了晶体应力集中。这一机制可能为热适应高能复合材料的设计提供有用的见解。

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引用次数: 0

Optimization of continuous 3D fiber paths for variable stiffness composite laminated shells with local geometric constraints 局部几何约束下变刚度复合材料层合壳连续三维纤维路径优化

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-28 DOI: 10.1016/j.compstruct.2026.120908

Wenjie Ding, Weiduan Li, Haitao Liao, Ran Tao, Yingtao Zhao

Variable stiffness composite laminated shells with continuous 3D fiber paths offer greater design freedom than laminates with straight fibers. However, their practical application in automated fiber placement requires reliable control of path geometry on curved surfaces. This study develops an optimization method in which each fiber path is idealized as a centerline with zero-width. A smooth scalar field is constructed in a planar parametric domain using an Expansion Optimal Linear Estimation (EOLE) basis derived from a Gaussian covariance model. Its contours are extracted at fixed intervals and mapped onto the shell surface. The EOLE coefficients form the deterministic design variables. Fiber orientation, normalized centerline density deviation, and spatial curvature are evaluated directly on the surface. Independent scalar fields are assigned to different plies in multilayer laminates. For a circular cylinder, a periodic chord distance improves contour correspondence and fiber direction consistency across the developed seam. Three examples, including a roof shell, a doubly curved shell, and a perforated cylinder, demonstrate improved stiffness and linear buckling load factors under the prescribed local geometric constraints. The proposed framework provides an effective approach to optimizing continuous fiber paths on complex curved shells.

具有连续3D纤维路径的变刚度复合材料层压壳比具有直纤维的层压壳具有更大的设计自由度。然而，它们在自动光纤放置中的实际应用需要可靠地控制曲面上的路径几何形状。本研究提出一种优化方法，将每条光纤路径理想化为零宽度中心线。利用基于高斯协方差模型的展开最优线性估计（EOLE）基，在平面参数域上构造光滑标量场。以固定的间隔提取其轮廓，并将其映射到壳体表面。EOLE系数构成确定性设计变量。纤维取向、标准化中心线密度偏差和空间曲率直接在表面上进行评估。将独立的标量场分配到多层层压板的不同层上。对于圆柱体，周期弦距提高了轮廓对应性和纤维方向的一致性。在规定的局部几何约束条件下，包括顶壳、双弯曲壳和穿孔圆柱在内的三个算例证明了改进的刚度和线性屈曲载荷系数。该框架为复杂曲面壳上连续光纤路径的优化提供了有效的方法。

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引用次数: 0

Effects of ply-angle-induced coupling stiffness on the aeroelastic response of 15MW floating wind turbine 夹角耦合刚度对15MW浮式风力机气动弹性响应的影响

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-18 DOI: 10.1016/j.compstruct.2026.120899

Xiaohang Qian, Yunpeng Xu, Jiawei Tan, Baoxuan Wang, Xun Wei, Ye Li

As floating wind turbines exceed 15 MW, the link between composite laminate decisions and system-level dynamics remains poorly understood. This study integrates 2D cross-sectional analysis with full aero-hydro-servo-elastic simulation to quantify how blade ply-angle variations alter the 6

\times

6 sectional stiffness matrix and subsequently affect rotor and platform responses of a 15 MW semi-submersible floating wind turbine. Results show that ply angle has limited influence on principal diagonal stiffness but significantly modifies all ply-angle-induced coupling components. Increasing the ply angle from 0° to 45° redistributes loads from flapwise bending to torsion—reducing flapwise displacement by 11% while increasing twist by 42%—which passively alleviates aerodynamic loads and reduces platform yaw by 56%, at the cost of a 5%–6% power loss. Multiple coupling mechanisms jointly govern these responses rather than bend–twist coupling alone, with bending–torsional coupling dominating under steady wind. Under turbulent inflow, stochastic excitation partially masks these effects, indicating that steady-state analysis alone would overestimate achievable load reduction. The present study establishes a quantitative relationship between laminate parameters, sectional coupling stiffness evolution, and integrated floating wind turbine dynamics, providing preliminary mechanism study foundation for the aeroelastic tailoring and multiscale structural design of large-scale composite wind turbine blades.

当浮动风力涡轮机超过15兆瓦时，复合材料层压决策与系统级动力学之间的联系仍然知之甚少。该研究将二维截面分析与全气动-液压-伺服-弹性模拟相结合，量化叶片夹角变化如何改变6x6截面刚度矩阵，并随后影响15mw半潜式浮式风力发电机的转子和平台响应。结果表明，铺层角对主对角刚度的影响有限，但对所有由铺层角引起的耦合分量都有显著影响。将铺层角度从0°增加到45°，将载荷从襟翼弯曲重新分配到扭转，从而减少11%的襟翼位移，增加42%的扭转，从而被动地减轻了气动载荷，减少了56%的平台偏航，但代价是5%-6%的功率损失。在稳定风下，多种耦合机制共同控制这些响应，而不是弯曲-扭转耦合，弯曲-扭转耦合占主导地位。在湍流流入下，随机激励部分掩盖了这些影响，这表明仅进行稳态分析可能会高估可实现的负荷减少。本研究建立了层压板参数、截面耦合刚度演化与整体浮式风力机动力学之间的定量关系，为大型复合材料风力机叶片气动弹性裁剪和多尺度结构设计提供了初步的机理研究基础。

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引用次数: 0

Multivariate assessment of freeze–thaw cycling on low-velocity impact response of CFRP composites 冻融循环对CFRP复合材料低速冲击响应的多元评价

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-28 DOI: 10.1016/j.compstruct.2026.120950

Mingze Gao, Xiaoping Gao, Xiaori Yang, Xin Jiang, Wei Wu, Lianhe Li

Freeze-thaw exposure and moisture ingress in cold environments can substantially affect the low-velocity impact performance of carbon fiber-reinforced polymer (CFRP) composites used in load-bearing structures. This study investigated the impact response of CFRP composites under four conditioning states, control (Con), saturated-only condition (SW), dry freeze–thaw cycling (DC), and water-saturated freeze–thaw cycling (WC), with 50, 100, and 200 cycles applied under a fixed thermal profile from −20 °C to 20 °C. Low-velocity impact tests were conducted, and the response was characterized by force–displacement response, energy dissipation, and impact damage metrics. The results showed that pre-saturation alone reduced impact stiffness and load-bearing capacity, while increasing FT exposure was accompanied by progressive degradation, with WC exhibiting the most severe deterioration. At 200 cycles, the peak force of WC decreased to 3.95 kN, while the absorbed-energy fraction increased to 89.84 %, accompanied by markedly larger residual dent depth and impacted-side damage area. Additionally, correlation, contribution, and response-surface analyses based on damage metrics further quantified the effects of moisture state and cycle count on the composites. These findings provide a quantitative basis for durability-informed assessment of CFRP composites subjected to impact loading in cold-service environments.

低温环境下的冻融暴露和受潮会严重影响碳纤维增强聚合物（CFRP）复合材料在承重结构中的低速冲击性能。本研究研究了CFRP复合材料在控制（Con）、纯饱和（SW）、干冻融循环（DC）和水饱和冻融循环（WC）四种状态下的冲击响应，分别在- 20°C至20°C的固定热环境下进行50、100和200次循环。进行了低速冲击试验，并对其响应进行了力位移响应、能量耗散和冲击损伤指标表征。结果表明，单独预饱和会降低冲击刚度和承载能力，而增加FT暴露会伴随着进行性退化，其中WC的退化最为严重。在200次循环时，WC的峰值力下降到3.95 kN，而吸收能量分数增加到89.84%，同时残余凹痕深度和冲击侧损伤面积明显增大。此外，基于损伤指标的相关性、贡献和响应面分析进一步量化了水分状态和循环次数对复合材料的影响。这些发现为CFRP复合材料在冷服务环境中承受冲击载荷的耐久性评估提供了定量基础。

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引用次数: 0

Mechanical and mass-transport design of hybrid TPMS-based metamaterial scaffold for orthopedic implants 基于复合tpms的骨科植入物超材料支架的力学与传质设计

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-28 DOI: 10.1016/j.compstruct.2026.120937

Heran Jia, Shengyu Duan, Yilin Guo, Mingcan Liu, Yunbo Bi, Jun Zheng, Ching-Chiuan Yen, Wen Feng Lu, Hongshuai Lei

Orthopedic implants have been widely used to treat massive bone defects in clinical applications. To realize physiological functions after implanting, the mechanical and mass-transport properties of the designed implants should match the properties of the human skeleton. Additive-manufactured titanium lattice scaffolds have aroused great attention due to their superior performances, which can be precisely tuned via cellular structure design. Titanium alloys also show good biocompatibility, which is essential for implants. However, it is still challenging to concurrently design the mechanical and mass-transport properties of metamaterial-infilled implants, which are both of great importance in clinical usage. In this work, a novel series of hybrid triply periodic minimal surface (TPMS)-based lattice unit cells were proposed based on Boolean operations, in which the modulus and permeability can be precisely tuned by adjusting the cellular geometric parameters. The mechanical and mass-transport properties were evaluated numerically, and mechanical experiments were conducted to verify the finite element results. Response surface models of the cellular properties were established based on finite element analysis results to describe influence of geometric parameters, and feasible domains of the geometric parameters for implant design were also calculated. Cell culturing tests were also performed to validate the biocompatibility of the additive-manufactured lattice scaffolds. The proposed hybrid TPMS structure decoupled cellular stiffness from permeability and broadened the accessible design space of TPMS-based microstructure. This work paves the way for the design and clinical application of additive-manufactured metamaterial-infilled orthopedic implants. The results indicated that the proposed hybrid TPMS cells possess great potential for the design of orthopedic implants.

骨科植入物在临床上广泛应用于治疗大面积骨缺损。为了实现植入后的生理功能，所设计的植入物的力学和传质特性必须与人体骨骼的特性相匹配。增材制造的钛晶格支架由于其优异的性能，可以通过细胞结构设计进行精确的调谐而引起了人们的广泛关注。钛合金还表现出良好的生物相容性，这是植入物必不可少的。然而，如何同时设计超材料填充植入体的力学性能和传质性能仍然是一个挑战，这在临床应用中具有重要意义。本文提出了一种基于布尔运算的基于混合三周期极小表面（TPMS）的新型晶格单元格，通过调整单元格的几何参数可以精确地调整其模量和渗透率。数值计算了其力学和传质特性，并进行了力学实验验证有限元结果。基于有限元分析结果，建立了细胞特性的响应面模型，描述了几何参数对种植体设计的影响，并计算了几何参数的可行域。还进行了细胞培养试验，以验证添加剂制造的晶格支架的生物相容性。提出的混合TPMS结构将细胞刚度与渗透性解耦，拓宽了基于TPMS的微观结构的可达设计空间。这项工作为增材制造的超材料填充骨科植入物的设计和临床应用铺平了道路。结果表明，所提出的混合TPMS细胞在骨科植入物的设计中具有很大的潜力。

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引用次数: 0

Developing explicit design equations for hygrothermal durability of pultruded FRP composites using physics-guided symbolic regression 利用物理导向的符号回归，开发拉挤玻璃钢复合材料湿热耐久性的显式设计方程

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-24 DOI: 10.1016/j.compstruct.2026.120931

TianQiao Liu, Xinmiao Guo, Kent A. Harries, Chao Wu, Su Chen, Weichen Xue, Xiuli Du

Pultruded fiber reinforced polymer (PFRP) composites are increasingly used in civil engineering. However, their long-term performance under hygrothermal aging remains challenging to predict quantitatively. Existing empirical methods lack physical interpretability, while physics-based models are often too complex for practical design. Although machine learning offers high accuracy, its “black-box” nature limits adoption in codified standards. To bridge this gap, this work employs physics-guided symbolic regression (SR) to develop explicit, interpretable design equations for predicting the hygrothermal durability of PFRP composites. Using a comprehensive database and embedding physical constraints, SR derives closed-form formulas for residual mechanical properties as functions of initial properties, aging duration, aging temperature, and material thickness. A unified mathematical framework is established, where the property-specific exponent α quantifies degradation sensitivity. Two model forms are derived: a best-fit model for accuracy (α₁) and a unified design model (α₂ = 1.33 for strengths and 1.22 for moduli) that simplifies practical application. Validation against natural weathering data confirms the reliability of the proposed equations, providing readily codifiable design tools for durable PFRP structures.

拉挤纤维增强聚合物（PFRP）复合材料在土木工程中的应用越来越广泛。然而，它们在湿热老化下的长期性能仍然难以定量预测。现有的经验方法缺乏物理可解释性，而基于物理的模型往往过于复杂，无法进行实际设计。虽然机器学习提供了很高的准确性，但它的“黑箱”性质限制了在编纂标准中的采用。为了弥补这一差距，这项工作采用物理指导的符号回归（SR）来开发明确的、可解释的设计方程，用于预测PFRP复合材料的湿热耐久性。利用综合数据库和嵌入的物理约束，SR导出了残余力学性能作为初始性能、时效时间、时效温度和材料厚度函数的封闭公式。建立了统一的数学框架，其中属性特定指数α量化了降解敏感性。推导出两种模型形式：精度的最佳拟合模型（α1）和简化实际应用的统一设计模型（α2 = 1.33，强度为1.22）。对自然风化数据的验证证实了所提出方程的可靠性，为耐用的PFRP结构提供了易于编纂的设计工具。

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引用次数: 0

Machine intelligence-driven anti-curvature metamaterials for optimally enhanced specific strength, stiffness and energy absorption 机器智能驱动的抗曲率超材料，以最佳方式增强比强度，刚度和能量吸收

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-08 DOI: 10.1016/j.compstruct.2026.120875

B.R. Isanaka, R.K. Varma, V. Kushvaha, T. Mukhopadhyay

Innovation in the coupled design of unit-cell geometry and cell wall-level architecture can be crucial for multifunctional metamaterials, enabling simultaneous programming of stiffness, strength, and energy absorption beyond conventional straight-beam lattices. Here, we propose an anti-curvature strategy that retains the typical advantages of bending-dominated architectures, such as high energy absorption, while also improving effective stiffness and strength that are normally associated with stretching-dominated lattices. Building on this premise, we integrate physics-informed curvature-guided geometric design of ligament profiles with machine-intelligence for efficient predictive modelling. Nonlinear finite element simulations are performed to quantify the influence of curvature direction under different modes of loading, including compression, tension, and shear. The numerical results reveal significant curvature-dependent enhancements without any notable increase in weight: up to 51.56% in stiffness, 60.42% in onset-of-failure stress, and 57.80% in energy absorption under mode-dependent normal loading. Additionally, anti-curvature designs under shear can improve effective stiffness, onset-of-failure stress and energy absorption by up to 66.72%, 81.26% and 91.67%, respectively. The coupled design space of physics-informed cell-wall curvature and unit cell geometry, augmented by a machine learning-assisted efficient predictive modelling, provides a scalable route to engineer lightweight lattices with superior specific strength, tunable stiffness, and enhanced energy absorption for multifunctional applications.

单元几何结构和细胞壁水平结构耦合设计的创新对于多功能超材料至关重要，可以同时编程刚度、强度和能量吸收，超越传统的直梁晶格。在这里，我们提出了一种抗曲率策略，它保留了弯曲主导结构的典型优势，如高能量吸收，同时也提高了通常与拉伸主导晶格相关的有效刚度和强度。在此前提下，我们将韧带轮廓的物理曲率导向几何设计与机器智能相结合，以实现高效的预测建模。进行了非线性有限元模拟，以量化曲率方向在不同加载模式下的影响，包括压缩、拉伸和剪切。数值结果显示，在模态相关的正常载荷下，曲率相关的增强效果显著，而重量没有显著增加：刚度增加51.56%，失效开始应力增加60.42%，能量吸收增加57.80%。抗剪抗弯设计可使有效刚度、起裂应力和能量吸收分别提高66.72%、81.26%和91.67%。基于物理信息的细胞壁曲率和单元胞几何的耦合设计空间，再加上机器学习辅助的高效预测建模，为设计具有优越比强度、可调刚度和增强的能量吸收的轻型晶格提供了可扩展的途径，可用于多功能应用。

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引用次数: 0

Strong hydrogen-bonding network-induced crystal growth and microstructural consolidation of bamboo fiber/MOC thermal insulation composites 竹纤维/MOC保温复合材料的强氢键网络诱导晶体生长和微观结构固结

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-27 DOI: 10.1016/j.compstruct.2026.120942

Nairong Chen, Yuhui Huang, Yanxiang Xiao, Haiyan Yao, Fan Yang, Yingfeng Zuo, Feng Li, Yiqiang Wu, Long Zheng

Driven by the low-carbon economy, the development of high-performance bamboo fiber-based magnesium oxychloride (MOC) composites offers significant potential for reducing energy consumption in modern manufacturing, yet the effective regulation of crystal structure of strengthening phase within the composites system remains challenge. Here, we developed high-performance bamboo fiber/MOC lightweight composites using a polyhydroxy-compound-induced crystallization strategy. Beyond improving the macroscopic properties of the composites, this study provided molecular-level insight into a possible mechanism underlying the induced crystallization of MOC hydrates. The combined experimental and simulation results suggest that hydrogen bonding and Mg²⁺ coordination between the polyhydroxy modifier and hydration species create a favorable local environment for hydrate association and 5-Phase crystallization. On this basis, we propose that the modifier acts as a molecular template that organizes hydration species in the vicinity of growing 5-Phase (5 Mg(OH)₂·MgCl₂·8H₂O) crystals. The resulting hydrogen-bonding interactions may stabilize local crystal assembly and suppress defect formation, thereby favoring the development of a denser and more stable crystalline architecture. Compared with conventional bamboo-fiber/MOC composites, our composites contained substantially fewer loose and defective crystal structures, leading to a 62% increase in compressive strength, a 35% increase in specific strength and an approximately 50% decrease in water absorption. They nevertheless remained ultralight inorganic foams, with a bulk density of 0.42 g cm⁻³, and maintained excellent thermal insulation, with a thermal conductivity of 0.079 W m⁻¹ K⁻¹. These findings offer a strategy for precise control over the crystal structure of composites and provide a foundation for the development of advanced functional biomass-based inorganic composites.

在低碳经济的推动下，高性能竹纤维基氯氧镁复合材料的发展为现代制造业的节能降耗提供了巨大的潜力，但如何有效调控复合材料体系中强化相的晶体结构仍然是一个挑战。在这里，我们利用多羟基化合物诱导结晶策略开发了高性能竹纤维/MOC轻质复合材料。除了提高复合材料的宏观性能外，该研究还为MOC水合物诱导结晶的可能机制提供了分子水平的见解。实验和模拟结果表明，多羟基改性剂和水化物质之间的氢键和Mg2⁺的配位为水合物缔合和五相结晶创造了良好的局部环境。在此基础上，我们提出该修饰剂作为一种分子模板，在生长的5相（5mg (OH)2·MgCl2·8H2O）晶体附近组织水化物质。由此产生的氢键相互作用可以稳定局部晶体组装并抑制缺陷的形成，从而有利于形成更致密和更稳定的晶体结构。与传统的竹纤维/MOC复合材料相比，我们的复合材料含有更少的松散和有缺陷的晶体结构，导致抗压强度提高62%，比强度提高35%，吸水率降低约50%。然而，它们仍然是超轻无机泡沫，体积密度为0.42 g cm−3，并保持了优异的隔热性能，导热系数为0.079 W m−1 K−1。这些发现为精确控制复合材料的晶体结构提供了一种策略，并为开发先进的功能生物质基无机复合材料提供了基础。

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引用次数: 0

Thermo-mechanical performance mapping from parameters and multi-objective optimization of bioinspired irregular porous structures 仿生不规则多孔结构的参数热力学性能映射及多目标优化

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-10-01 Epub Date: 2026-09-28 DOI: 10.1016/j.compstruct.2026.120951

Jiandong Yang, Xiaohong Ding, Min Xiong, Heng Zhang

Integrated thermal protection structures (ITPS) for hypersonic vehicles require porous core layers to simultaneously achieve lightweight, load-bearing, and thermal protection performance. Porous structures offer significant advantages in meeting such multifunctional requirements. This study constructs a parametric model incorporating boundary perturbations, with porosity, equivalent diameter, aspect ratio, and rotation angle as geometric configuration parameters, and utilizes the trained neural network surrogate model to establish the quantitative mapping between these parameters and thermo-mechanical performance, providing the basis for multi-objective optimization design. Results indicate that effective stiffness and thermal conductivity degrade with increasing porosity following power-law relations with exponents of 2.01 and 1.48, consistent with the Gibson-Ashby model and the Maxwell-Eucken theory, with the load-bearing penalty substantially exceeding the thermal protection benefit under lightweighting. Under the same porosity, equivalent diameter has a limited effect on stiffness, whereas a smaller pore size effectively improves thermal protection. Aspect ratio is the primary driver of performance anisotropy, and adjusting it together with rotation angle can maximize load-bearing in the principal loading direction without significantly sacrificing thermal protection. The overall performance of irregular structures is comparable to that of regular ones, yet irregular structures withstand loading direction variations more effectively. A multi-objective optimization was performed for the ITPS core layer, and the feasible design domain was delineated under a certain practical constraint of ITPS. Under this particular case, for circular pore configurations, the feasible porosity range is 0.31–0.40. By adjusting the aspect ratio, aligning the major axis of elliptical pores with the principal loading direction, the anisotropic strengthening effect extends the feasible porosity upper limit from 0.40 to 0.48, thereby broadening the lightweight design window. The proposed method provides a parametric design basis for the porous structures with comprehensive consideration of thermo-mechanical performance.

高超声速飞行器的集成热防护结构（ITPS）需要多孔核心层，以同时实现轻量化、承载和热防护性能。多孔结构在满足这种多功能要求方面具有显著的优势。本研究以孔隙度、等效直径、纵横比和旋转角度为几何构型参数，构建了包含边界摄动的参数化模型，并利用训练好的神经网络代理模型建立了这些参数与热力学性能之间的定量映射关系，为多目标优化设计提供依据。结果表明，有效刚度和导热系数随孔隙率的增加而降低，其指数分别为2.01和1.48，符合Gibson-Ashby模型和Maxwell-Eucken理论，且轻量化下的承载损失大大超过热防护收益。在相同孔隙率下，等效直径对刚度的影响有限，而较小孔径则能有效提高热防护性能。长宽比是性能各向异性的主要驱动因素，调整长宽比和旋转角度可以在不显著牺牲热防护的情况下最大化主加载方向的承载能力。不规则结构的整体性能与规则结构相当，但不规则结构更能承受载荷方向的变化。对ITPS核心层进行多目标优化，在一定的ITPS实际约束条件下，划分出可行设计域。在这种特殊情况下，对于圆形孔隙结构，可行孔隙度范围为0.31-0.40。通过调整宽高比，使椭圆孔隙的长轴与主加载方向对齐，各向异性强化效应将可行孔隙度上限从0.40扩展到0.48，从而拓宽了轻量化设计窗口。该方法为综合考虑热力学性能的多孔结构参数化设计提供了依据。

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