Composite Structures最新文献_第8页

Performance assessment of 3D printed multi-material energy absorber for automotive bumper: pedestrian lower extremity protection 汽车保险杠用3D打印多材料吸能器性能评价：行人下肢保护

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-09 DOI: 10.1016/j.compstruct.2026.120056

Komal Chawla , Ahmed Arabi Hassen , Nikhil Garg , Deepak Kumar Pokkalla , Tyler Smith , Brittany Rodriguez , Desheng Yao , Rayne Zheng , Ellen Lee , Iskander Farooq , Matthew Rebandt , Asim Khan , Seokpum Kim

Designing an energy absorber for automotive bumpers involves balancing low-speed and high-speed impacts to ensure safety, reduce repair costs, and meet regulatory standards. This study explores a novel design using multi-material 3D printing and structural optimization to fabricate a lightweight and cost-efficient energy absorber. The design effectively dissipates energy in low-speed collisions and minimizes force transmission in high-speed pedestrain impacts, helping to meet both safety and performance requirements. The energy absorber design combines 20% carbon fiber-reinforced acrylonitrile butadiene styrene (CF-ABS) and thermoplastic polyurethane (TPU) for optimal stiffness and flexibility. It uses 3D-printed lattice structures optimized through finite element simulations to help meet both low-speed and high-speed impact requirements. Full-scale energy absorbers were 3D-printed using optimized CF-ABS/TPU blends and tested under high-speed impact using the Flexible Pedestrian Legform Impactor (Flex-PLI). For fair comparison, a baseline bumper with a traditional triangular lattice structure, also 3D-printed from the same CF-ABS/TPU materials, was similarly tested. Interestingly, both the optimized and baseline 3D-printed energy absorbers showed nearly identical performance, successfully meeting injury limits. Their performances were also benchmarked against an injection-molded energy absorber. While both 3D-printed and injection-molded designs met injury limits, the 3D-printed absorber exhibited a higher tibia bending moment, indicating an opportunity for further optimization. A Techno-Economic Analysis compared the costs of producing energy absorbers using traditional manufacturing and 3D printing. The analysis highlighted that 3D printing offers cost benefits for low to medium production volumes, with the total cost per energy absorber at ∼ $74, compared to traditional methods that become economical beyond 2000 units.

设计汽车保险杠的能量吸收器需要平衡低速和高速碰撞，以确保安全，降低维修成本，并符合监管标准。本研究探索了一种使用多材料3D打印和结构优化的新设计，以制造轻质且经济高效的能量吸收器。这种设计在低速碰撞中有效地耗散能量，在高速行人碰撞中最大限度地减少力传递，有助于满足安全和性能要求。能量吸收器的设计结合了20%的碳纤维增强丙烯腈-丁二烯苯乙烯（CF-ABS）和热塑性聚氨酯（TPU），以获得最佳的刚度和灵活性。它使用通过有限元模拟优化的3d打印晶格结构，以帮助满足低速和高速冲击要求。采用优化的CF-ABS/TPU共混物对全尺寸吸能器进行了3d打印，并使用Flexible Pedestrian Legform impact （Flex-PLI）在高速冲击下进行了测试。为了公平比较，采用相同CF-ABS/TPU材料3d打印的传统三角形晶格结构的基准保险杠也进行了类似的测试。有趣的是，优化后的能量吸收器和基线3d打印的能量吸收器表现出几乎相同的性能，成功地满足了伤害限制。它们的性能也与注射成型能量吸收器进行了基准测试。虽然3d打印和注塑设计都符合损伤限制，但3d打印的减振器表现出更高的胫骨弯矩，这表明有进一步优化的机会。一项技术经济分析比较了使用传统制造和3D打印生产能量吸收器的成本。分析强调，与传统方法相比，3D打印为中低产量提供了成本效益，每个能量吸收器的总成本为74美元，超过2000个单位就变得经济。

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引用次数: 0

A study on the mechanical property requirements of the resin for composite overwrapped pressure vessels under cryogenic high-pressure conditions 低温高压条件下复合包覆压力容器用树脂力学性能要求研究

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-10 DOI: 10.1016/j.compstruct.2026.120057

Zhuangzhuang Cao , Zhoutian Ge , Liangliang Qi , Sohail Yasin , Jianfeng Shi

Developing and modifying resins with excellent cryogenic mechanical properties is an effective solution to prevent matrix cracking in the composite overwrapped pressure vessels (COPVs) under cryogenic high-pressure conditions. However, the applicability of resins in COPVs at cryogenic temperatures still relies on experimental results, lacking appropriate mechanical property evaluation index for the resin. Therefore, this study established an analytical framework for “resin properties − composite material properties − vessel safety” and proposed mechanical property requirements for resins. In the framework, the stress and failure behavior of COPVs under cryogenic high-pressure conditions were analyzed based on three-dimensional elasticity theory and the Hashin failure criterion. The effects of resin tensile strength, elastic modulus, and coefficient of thermal expansion on the failure of COPVs were also examined. The results indicate the composite layer of COPVs undergoes matrix failure at lower internal pressures at cryogenic temperatures. Enhancing resin tensile strength, decreasing resin elastic modulus, and reducing the coefficient of thermal expansion are beneficial for improving the critical failure pressure at matrix failure. Furthermore, two-stage mechanical property requirements and specific indices for resins were established, providing guidance for the modification and development of resins for COPVs under cryogenic high-pressure conditions.

开发和改性具有优异低温力学性能的树脂是防止复合材料包覆压力容器（copv）在低温高压条件下基体开裂的有效途径。然而，树脂在低温下在copv中的适用性仍然依赖于实验结果，缺乏合适的树脂力学性能评价指标。因此，本研究建立了“树脂性能-复合材料性能-容器安全”的分析框架，并提出了树脂的力学性能要求。在此框架下，基于三维弹性理论和Hashin破坏准则，分析了低温高压条件下copv的应力和破坏行为。研究了树脂抗拉强度、弹性模量和热膨胀系数对copv破坏的影响。结果表明，低温下较低的内压下，copv复合层发生基体破坏。提高树脂抗拉强度，降低树脂弹性模量，降低热膨胀系数，有利于提高基体破坏时的临界破坏压力。建立了树脂的两阶段力学性能要求和具体指标，为低温高压条件下copv用树脂的改性和开发提供了指导。

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引用次数: 0

Explosion damage evaluation of hybrid BFRP-steel bars and short BFRP fibers reinforced concrete shield tunnel segments BFRP-钢混合筋与短BFRP纤维增强混凝土盾构隧道管片爆炸损伤评价

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.compstruct.2026.120036

Min Hou , Ruiyi Jiang , Jiang Feng , Zhenyu Qiu , Hualin Fan

Combining mechanisms of plasticity and ductility of steel bars, long elastic deformation, high tensile strength and wave impedance consistency with concrete of basalt fiber reinforced polymer (BFRP) rebars, and high tensile strength and spalling resistance of short BFRP fibers (SBFs) reinforced concrete, SBFs-reinforced concrete (SRC) shield tunnel segment (STS) specimens reinforced by hybrid BFRP-steel rebars were prepared to get improved explosion resistance. Full-scale explosion experiments were carried out to capture the dynamic damage styles from cracking, spalling to perforation. Residual load bearing capacity was applied to quantitively evaluate the structural damage of the exploded STS specimens through quasi-static flexural experiments. The research reveals that spalling and perforation greatly reduce the bearing capacity of the STS. Under explosion of the same scaled distance (SD), the hybrid rebars reinforced tunnel segment (HRRTS) has much smaller structural damage, as concrete spalling is obviously attenuated by the BFRP bars and SBFs. The experiments strongly support potential applications of HRRTS in underground protective structures.

结合玄武岩纤维增强聚合物（BFRP）钢筋的塑性延性、长弹性变形、高抗拉强度和与混凝土波阻抗一致性的机理，以及短BFRP纤维（SBFs）增强混凝土的高抗拉强度和抗剥皮性能，制备了BFRP-钢筋混合增强的sfs -钢筋混凝土（SRC）盾构隧道管段（STS）试件，以提高其防爆性能。进行了全尺寸爆炸试验，捕捉了从开裂、剥落到射孔的动态损伤类型。通过拟静力弯曲试验，应用残余承载能力定量评价爆炸后STS试件的结构损伤。研究表明，剥落和穿孔大大降低了STS的承载能力。在相同比例距离（SD）的爆炸作用下，复合钢筋加固隧道管段（HRRTS）的结构损伤要小得多，因为复合frp筋和单轴筋对混凝土剥落有明显的抑制作用。实验结果有力地支持了HRRTS在地下防护结构中的潜在应用。

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引用次数: 0

Uncertainty quantification of the stiffness and strength of particle-reinforced composites accelerated by a machine-learning-based homogenisation method 基于机器学习的均匀化方法加速颗粒增强复合材料刚度和强度的不确定性量化

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.compstruct.2026.120052

Chuang Ma , Yichao Zhu

This article proposes an efficient scheme for stiffness and strength uncertainty quantification of three-dimensional linearly elastic particle-reinforced composites (PRCs). The stochastic particle distribution within a representative volume element (RVE) is described with a randomly perturbed mesoscale mapping function. Such a way of uncertainty quantification, with the used of a machine learning based reiterated asymptotic homogenisation and localisation method, enables fast evaluation of the RVE mechanical behaviour. It is shown that it takes a laptop computer 26 min to output the maximum von Mises values of 8000 stochastic RVE. Equipped with such a high-efficiency method, one may (a) quickly analyse the ranges of RVE stiffness and strength against the RVE stochastic measure; (b) quickly determine the probability of failure initiation in an RVE bearing a certain volume fraction under any macroscopic applied strain. Moreover, a well-trained neural networks for a given set of material selection can be quickly prepared for other constituting materials with the use of the transfer learning technique.

本文提出了一种有效的三维线弹性颗粒增强复合材料刚度和强度不确定性量化方案。用随机摄动中尺度映射函数描述了代表性体积元（RVE）内的随机粒子分布。这种不确定性量化方法使用基于机器学习的重复渐近均匀化和定位方法，可以快速评估RVE力学行为。结果表明，一台笔记本电脑需要26min才能输出8000随机RVE的最大von Mises值。采用这种高效率的方法，可以(a)根据RVE随机测量快速分析RVE刚度和强度的范围；(b)在任意宏观外加应变下，快速确定承载一定体积分数的RVE发生破坏的概率。此外，对于给定的一组材料选择，训练良好的神经网络可以使用迁移学习技术快速准备其他构成材料。

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引用次数: 0

Integrated multiscale modelling strategy for shape-memory polymer nanocomposites: Linking surface chemistry-driven filler distribution to macroscopic properties 形状记忆聚合物纳米复合材料的集成多尺度建模策略：将表面化学驱动的填料分布与宏观性能联系起来

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.compstruct.2026.120045

Sungwoo Park , Jeong-ha Lee , Maenghyo Cho , Yun Seog Lee , Seunghwa Yang

Obtaining uniform nanoparticle dispersion in polymer matrices is essential for multifunctional properties of shape-memory polymer (SMP) nanocomposites. However, existing computational approaches do not completely account for the effects of nanoparticle surface treatment on nanoparticle dispersion and the impact of this dispersion on nanocomposite properties. This work presents an integrated multiscale modelling framework combining all-atom molecular dynamics (MD), dissipative particle dynamics (DPD), and finite element (FE) homogenization to connect nanoparticle surface chemistry, filler distribution, interphase structure, and macroscopic properties of shape-memory polyurethane (SMPU) nanocomposites. Solubility parameters and mixing energies of SMPU segments and silica nanoparticles were obtained from MD simulations to evaluate surface treatment effects on dispersion. These results informed Flory–Huggins parameters for DPD, enabling quantification of nanoparticle clustering as a function of hard-segment content (HSC) and nanoparticle loading. Based on this methodology, a framework was developed to predict optimal surface treatments for enhanced nanoparticle dispersion. DPD-driven nanocomposite morphologies were then integrated with FE homogenization to estimate mechanical properties. The methodology was further applied to nanocomposites with non-spherical fillers, demonstrating prediction of mechanical performance of cylindrical nanoparticle-reinforced systems as a function of HSC and surface treatment. This approach provides a versatile computational tool for guiding nanocomposite design and optimization.

形状记忆聚合物（SMP）纳米复合材料的多功能性能需要在聚合物基体中获得均匀的纳米颗粒分散。然而，现有的计算方法并没有完全考虑纳米颗粒表面处理对纳米颗粒分散的影响以及这种分散对纳米复合材料性能的影响。本研究提出了一个集成的多尺度建模框架，结合了全原子分子动力学（MD）、耗散粒子动力学（DPD）和有限元（FE）均质化，以连接纳米颗粒表面化学、填料分布、相间结构和形状记忆聚氨酯（SMPU）纳米复合材料的宏观性能。通过MD模拟得到SMPU片段和二氧化硅纳米颗粒的溶解度参数和混合能，以评价表面处理对分散的影响。这些结果为DPD的Flory-Huggins参数提供了信息，从而可以定量纳米颗粒聚类作为硬段含量（HSC）和纳米颗粒负载的函数。基于这种方法，开发了一个框架来预测增强纳米颗粒分散的最佳表面处理。然后将dpd驱动的纳米复合材料形貌与FE均匀化相结合，以估计其力学性能。该方法进一步应用于非球形填充的纳米复合材料，证明了圆柱形纳米颗粒增强体系的力学性能预测是HSC和表面处理的函数。这种方法为指导纳米复合材料的设计和优化提供了一种通用的计算工具。

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引用次数: 0

Improvement of figure-of-merit in nanostructured vanadium-zinc-oxide composites thin film for high-sensitivity underwater piezoelectric micromachined transducers 用于高灵敏度水下压电微机械换能器的纳米结构钒锌氧化物复合薄膜的性能改进

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-05 DOI: 10.1016/j.compstruct.2025.120008

Wei Gao , Jianing Zhang , Chuqiao Wang , Yongyao Chen

Piezoelectric micromachined ultrasonic transducers (PMUTs), leveraging micro-electro-mechanical-systems technology and piezoelectric effects, have emerged as a promising solution for underwater acoustic applications. Piezoelectric material performance has been a decisive element for unlocking PMUTs potential. Key properties including piezoelectric coefficient (e_{31, f}, d_{33, f}), dielectric permittivity (ε_{33, f}) and loss, directly govern PMUTs functionality. In this work, a nanostructured vanadium-zinc-oxide (VZO) piezoelectric composite film is prepared, characterized and implemented to achieve high-performance PMUTs for underwater detection. The VZO-PMUT is designed and fabricated using micromachined process. The influences of key fabrication parameters including sputtering power, pressure, argon-oxygen ratio, and annealing temperatures on the films are detailed studied. Through observing the surface morphologies, measuring the crystal structure, and identifying chemical element states etc., the mechanisms of the enhanced piezoelectric and dielectric behavior are analyzed. A record figure of merit (FOM, e²_{31, f} /ε₀ε_{33, f}) of 1090 GPa is achieved with significant advances of e_{31, f} (−12.5 C/m²) and ε_{33, f} (16.2). Demonstrations in a water tank for VZO-PMUTs reveal with a transmitting response of 154.5 dB re. 1 V/µPa @ 127 kHz and receive sensitivity of −158 dB re. 1 µPa/V @ 123 kHz. Moreover, VZO-PMUTs achieve precisely range-finding of underwater obstacles, indicating great potentials in underwater acoustic application.

利用微机电系统技术和压电效应的压电微机械超声换能器（PMUTs）已成为水声应用的一种有前途的解决方案。压电材料的性能一直是释放PMUTs潜力的决定性因素。关键性能包括压电系数（e31, f, d33, f），介电常数（ε33, f）和损耗，直接影响PMUTs的功能。本文制备了一种纳米结构的钒锌氧化物（VZO）压电复合薄膜，并对其进行了表征和实现，以实现用于水下探测的高性能PMUTs。VZO-PMUT采用微机械工艺设计和制造。详细研究了溅射功率、压力、氩氧比和退火温度等关键工艺参数对薄膜性能的影响。通过观察表面形貌、测量晶体结构、识别化学元素状态等，分析了压电介质性能增强的机理。在e31， f （- 12.5 C/m2）和ε33， f（16.2）的显著进步下，获得了1090 GPa的优异值（FOM, e231, f /ε0, ε33, f）。VZO-PMUTs在水箱中的演示显示，发射响应为154.5 dB re. 1 V/µPa @ 127 kHz，接收灵敏度为- 158 dB re. 1µPa/V @ 123 kHz。此外，vzo - pmut可以实现水下障碍物的精确测距，在水声应用中具有很大的潜力。

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引用次数: 0

A generalized equivalent volume theory and model including Poisson interactions for layered composite structures 含泊松相互作用的层状复合材料结构的广义等效体积理论和模型

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-04 DOI: 10.1016/j.compstruct.2025.120025

Mehmet Zor

This study proposes a new equivalent volume model that incorporates Poisson effects to represent the planar elastic behavior of n-layered composite structures. Although each layer may exhibit orthotropic or monoclinic behavior in its own local coordinate system, the equivalent volume shows a monoclinic mechanical response in the global x-y plane. The theory assumes perfect bonding between layers, leading to equal directional strains across the structure under tensile or compressive loading in the layer plane. It is formulated to generalize the model for all n-layered structures by considering each layer with different thickness and locally orthotropic properties.

The unique aspect distinguishing the theory from other methods is the incorporation of Poisson interactions between layers into the calculations and the ability to express equivalent volume properties through closed-form equations. Specially defined Poisson interaction coefficients are introduced, allowing the mechanical interaction potential of each layer with others to be integrated into the model. As a result, directional elastic properties such as

E_{x}

,

E_{y}

,

v_{xy}

and

v_{yx}

are derived analytically, while the shear modulus

G_{xy}

is calculated by volumetric averaging under the assumption of common shear deformation in all layers.

The model is applicable to both symmetric and non-symmetric n-layered structures and has been evaluated against classical methods such as Voigt, Reuss, CLT and other methods for laminates composed of orthotropic layers. Comparisons show that changes in fiber orientation or layer properties lead to distinct differences between the model and classical methods.

本文提出了一种新的等效体积模型，结合泊松效应来表征n层复合材料结构的平面弹性行为。虽然每一层在自己的局部坐标系中可能表现出正交异性或单斜行为，但等效体积在全局x-y平面上表现出单斜力学响应。该理论假设层与层之间的完美结合，导致在层平面的拉伸或压缩载荷下，整个结构的方向应变相等。通过考虑各层的不同厚度和局部正交各向异性，将模型推广到所有n层结构。该理论区别于其他方法的独特之处在于将层间泊松相互作用纳入计算，并能够通过封闭形式的方程表达等效体积性质。引入了特殊定义的泊松相互作用系数，允许将每层与其他层的力学相互作用势集成到模型中。由此，解析导出了Ex、Ey、vxy、vyx等方向弹性特性，在各层共同剪切变形假设下，采用体积平均法计算剪切模量Gxy。该模型适用于对称和非对称n层结构，并与Voigt， Reuss， CLT等经典方法对正交各向异性层合板进行了评估。对比表明，由于纤维取向或层性质的变化，模型与经典方法存在明显差异。

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引用次数: 0

Data-driven-AI and Layerwise-Variable-Kinematic models for the vibration analysis of sandwich panels with auxetic lattice core and functionally graded graphene nanoplatelet-reinforced coatings 基于数据驱动的人工智能和分层可变运动学模型的石墨烯纳米片增强夹层板的振动分析

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2025-12-31 DOI: 10.1016/j.compstruct.2025.120021

R.W. Laureano , J.L. Mantari

This study investigates the vibration response of sandwich panels with auxetic lattice cores and functionally graded graphene platelet reinforced composite (FG-GPLRC) face sheets using Equivalent Single Layer (ESL), Layerwise (LW), and variable-kinematic models formulated within the robust unified formulation. The enhanced Tornabene homogenization model and Halpin-Tsai micromechanics model are employed to compute the effective properties of the auxetic core and FG-GPLRC face sheets, respectively. The dynamic governing equations, derived using the Principle of Virtual Displacements (PVD), are solved in strong form via the Boundary-Continuous Method (BCM). Several cases with increasing complexity are considered. A unique case, previously unexplored in the shell literature, is introduced, offering a new benchmark for future comparisons. The results reveal that the hybrid ESL/LW capabilities of the proposed variable-kinematic model provide highly accurate and efficient analytical solutions for these complex sandwich structures, offering 87% reduction in the computational cost against their LW counterpart. The effects of GPL reinforcements in the face sheets and the auxetic response are investigated through parametric studies using an efficient surrogate model based on Artificial Neural Networks (ANNs). This model was trained on a synthetic dataset, generated by the most accurate analytical model, where geometric dimensions, auxetic properties, and GPL parameters were used as input features.

本研究使用等效单层（ESL）、分层（LW）和可变运动模型，在鲁棒统一公式中研究了具有缺陷晶格芯和功能梯度石墨烯血小板增强复合材料（FG-GPLRC）面板的夹层板的振动响应。采用增强的Tornabene均质模型和Halpin-Tsai细观力学模型分别计算了增厚芯和FG-GPLRC面片的有效性能。利用虚位移原理（PVD）推导出的动力学控制方程，通过边界连续法（BCM）以强形式进行求解。考虑了几种日益复杂的情况。介绍了shell文献中以前未探索的一个独特案例，为将来的比较提供了新的基准。结果表明，所提出的可变运动学模型的混合ESL/LW能力为这些复杂的夹层结构提供了高精度和高效的分析解决方案，与LW模型相比，计算成本降低了87%。采用基于人工神经网络（ann）的高效代理模型，通过参数化研究研究了GPL增强对面片的影响和辅助反应。该模型是在一个合成数据集上进行训练的，该数据集是由最精确的分析模型生成的，其中几何尺寸、auxetic属性和GPL参数用作输入特征。

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引用次数: 0

Pressure-dependent strain gradient plasticity for micro-mechanical analyses of fibre-reinforced polymers 纤维增强聚合物微力学分析的压力依赖应变梯度塑性

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2025-12-19 DOI: 10.1016/j.compstruct.2025.119965

Igor A. Rodrigues Lopes , A. Francisca Carvalho Alves , Nathan Klavzer , Thomas Pardoen , Pedro P. Camanho

A new constitutive model for epoxy resins is proposed to accurately capture the micro-scale strain fields in fibre-reinforced composites. The model extends conventional plasticity by introducing strain-gradient effects through an implicit gradient formulation that accounts for pressure sensitivity and asymmetric tension/compression behaviour-critical features to represent the mechanical response of epoxies at small scales. The formulation is implemented in a commercial finite element platform through user-defined subroutines and solved via an analogy with coupled thermo-mechanical problems that include Helmholtz-type equations. The ability of the model to predict the size-dependent response and to prevent unrealistic overpredictions of strain magnitude is illustrated through the simulation of nanoindentation on neat epoxy and of the local strain field behaviour in a composite. The results are compared with experimental data, which are also used to calibrate the additional constitutive parameters through a composite Bayesian optimization strategy. The proposed framework significantly improves the predictive capabilities of micromechanical models for composite materials by incorporating scale-dependent plasticity mechanisms.

为了准确捕捉纤维增强复合材料的微尺度应变场，提出了一种新的环氧树脂本构模型。该模型通过隐式梯度公式引入应变梯度效应，扩展了传统的塑性，该公式考虑了压力敏感性和不对称拉伸/压缩行为的关键特征，以表示环氧树脂在小尺度上的机械响应。该公式通过用户定义的子程序在商业有限元平台上实现，并通过类比包括亥姆霍兹型方程的耦合热-力学问题来求解。通过模拟环氧树脂上的纳米压痕和复合材料中的局部应变场行为，说明了该模型预测尺寸相关响应和防止应变幅度不切实际的过度预测的能力。结果与实验数据进行了比较，并通过复合贝叶斯优化策略对附加本构参数进行了标定。该框架通过纳入尺度相关的塑性机制，显著提高了复合材料微观力学模型的预测能力。

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引用次数: 0

Computational continua method for multiscale progressive damage analysis of 3D braided composite I-beam under bending load 弯曲荷载作用下三维编织复合材料工字梁多尺度渐进损伤分析的计算连续方法

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-03 DOI: 10.1016/j.compstruct.2025.120017

Aoshuang Wan , Zhen Zhi , Dinghe Li

This paper presents a numerical and experimental research of the multiscale mechanical response and damage evolution mechanisms of three-dimensional five-directional (3D5D) braided composite I-beam under three-point bending load. A new multiscale progressive damage analysis method is proposed by integrating the computational continua (C²) method, non-local damage theory and failure criteria, which is suitable for the the 3D5D braided composites having large and complex microscopic unit cell (UC) as it can describe the non-negligible macroscopic stress/strain variation on the microscopic UC domain. The simulation results of macroscopic load–displacement response and strain field distribution as well as microscopic damage evolution process are in good agreement with the experimental results and observations, demonstrating validity of the proposed method. The results show that the load–displacement curves can be divided into five stages in general. The microscopic damage mainly initiates at the upper flange region near the indenter in a sequence of matrix cracking, yarn/matrix interfacial debonding and yarn breakage, which then grows downward in a semicircle. Until the final fracture of I-beam, it maintains a good load bearing capacity even after extensive damage growth in the upper flange owing to the slow damage growth in the web, demonstrating its excellent damage tolerance performance.

本文对三维五向编织复合材料工字梁在三点弯曲荷载作用下的多尺度力学响应及损伤演化机制进行了数值与实验研究。将计算连续线（C2）方法、非局部损伤理论和破坏准则相结合，提出了一种新的多尺度递进损伤分析方法，该方法可以描述微观单元胞（UC）上不可忽略的宏观应力应变变化，适用于具有大而复杂微观单元胞的3D5D编织复合材料。宏观荷载-位移响应和应变场分布以及细观损伤演化过程的模拟结果与实验结果和观测结果吻合较好，验证了所提方法的有效性。结果表明，荷载-位移曲线大致可分为5个阶段。细观损伤主要从靠近压头的上翼缘区域开始，由基体开裂→纱/基界面脱粘→纱断裂依次进行，然后沿半圆形向下扩展。在工字梁最终断裂之前，由于腹板损伤增长缓慢，即使上翼缘出现大面积损伤，其仍能保持良好的承载能力，显示出优异的损伤容限性能。

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引用次数: 0