Composite Structures最新文献

Thermal expansion behaviour of short-fibre-reinforced 3D-printed composites: A numerical and experimental study 短纤维增强3d打印复合材料的热膨胀行为：数值和实验研究

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.compstruct.2026.120130

Yuheng Zhou, Farimah Tikhani, Pascal Hubert

The thermal expansion behaviour of short-fibre-reinforced 3D-printed (SFR 3DP) composites has been studied primarily through analytical models focusing on the longitudinal direction, whereas the transverse behaviour has received limited attention. In addition, full-field finite element (FE) modelling of thermal expansion in SFR 3DP composites remains relatively uncommon. In this study, the coefficient of thermal expansion (CTE) of SFR 3DP composites, specifically polycarbonate with various levels of glass fibre reinforcement, is predicted using five analytical models (Turner, Kerner, Schapery, No-Interaction (NI), and Mori–Tanaka (MT)) alongside full-field FE models, and the results are compared with thermo-mechanical analysis (TMA) data in both longitudinal and transverse directions. In the longitudinal direction, the Schapery model is most accurate at low fibre contents, the MT model at higher contents, while the FE model remains highly accurate across the entire range. In the transverse direction, the MT model provides virtually identical accuracy to the FE model at every fibre content. Overall, the analytical approaches can match the predictive power of full-field FE modelling for CTE of SFR 3DP composites. Longitudinally, the FE method remains the more general tool, whereas the accuracy of analytical models is more sensitive to fibre content. Transversely, both approaches perform equally well.

短纤维增强3d打印（SFR 3DP）复合材料的热膨胀行为主要是通过聚焦于纵向的分析模型来研究的，而横向行为受到的关注有限。此外，SFR - 3DP复合材料热膨胀的全场有限元（FE）模拟仍然相对少见。在这项研究中，使用五种分析模型（Turner, Kerner, Schapery, No-Interaction （NI）和Mori-Tanaka (MT)）和全场有限元模型预测了SFR 3DP复合材料（特别是具有不同水平玻璃纤维增强的聚碳酸酯）的热膨胀系数（CTE），并将结果与纵向和横向的热力学分析（TMA）数据进行了比较。在纵向上，Schapery模型在纤维含量低时最准确，MT模型在纤维含量高时最准确，而FE模型在整个范围内都保持高度准确。在横向上，MT模型在每一种纤维含量上都提供了与FE模型几乎相同的精度。总体而言，分析方法可以匹配SFR 3DP复合材料CTE的全场有限元模型的预测能力。纵向上，有限元方法仍然是更通用的工具，而分析模型的准确性对纤维含量更敏感。横向来看，这两种方法的效果都一样好。

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引用次数: 0

The role of steel fibers in the bond behavior of CFRP-UHPFRC joints: A mesoscale finite element study 钢纤维在CFRP-UHPFRC接头粘结行为中的作用：中尺度有限元研究

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-08 DOI: 10.1016/j.compstruct.2026.120143

Yaqi Li , Zhenjun Yang , Xin Zhang , Songbo Wang , Yu Su

This study investigates the influence of steel fibers on the bond performance between ultra high performance fiber reinforced concrete (UHPFRC) and adhesively bonded carbon fiber reinforced polymer (CFRP) laminates through mesoscale finite element (FE) modelling. The models incorporate randomly distributed elastoplastic beam elements to simulate the fibers, the nonlinear cohesive elements to simulate the fiber-mortar interfaces, and the concrete damage plasticity model to simulate the mortar, so that all the main failure mechanisms including fiber bending, sliding, pull-out, rupture, mortar cracking and fiber-mortar interfacial debonding can be modelled. The simulated results were first validated against 10 single shear pull-off tests of CFRP-UHPFRC bonded joints. The results indicated that adding steel fibers altered the failure mode from substrate splitting to CFRP debonding and enhanced the bond strength by 4–28%, although adding fibers beyond 2% led to marginal increases. Extensive mesoscale parametric simulations were then conducted, identifying the mortar tensile strength and the fiber orientation as the most effective factors in enhancing both the bond strength and the ductility. Based on the simulation results, a semi-analytical model was proposed to predict the bond strength of CFRP-UHPFRC joints, which extended the Chen and Teng’s model by incorporating a fiber influence coefficient.

本研究通过中尺度有限元（FE）模拟研究了钢纤维对超高性能纤维增强混凝土（UHPFRC）与碳纤维增强聚合物（CFRP）胶结层合板粘结性能的影响。该模型采用随机分布弹塑性梁单元模拟纤维，非线性黏聚单元模拟纤维-砂浆界面，混凝土损伤塑性模型模拟砂浆，从而可以模拟纤维弯曲、滑动、拉出、断裂、砂浆开裂和纤维-砂浆界面脱粘等主要破坏机制。模拟结果首先通过10次CFRP-UHPFRC粘结节点的单次剪切拉断试验进行验证。结果表明：钢纤维的加入改变了碳纤维复合材料的破坏模式，使其从基材劈裂转变为碳纤维复合材料脱粘，粘结强度提高了4-28%，但添加量超过2%时粘结强度略有提高；然后进行了广泛的中尺度参数模拟，确定砂浆的抗拉强度和纤维取向是提高粘结强度和延性的最有效因素。在模拟结果的基础上，提出了CFRP-UHPFRC接头结合强度的半解析模型，该模型通过加入纤维影响系数对Chen和Teng模型进行了扩展。

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引用次数: 0

Accurate burst pressure prediction of filament-wound composite casings via a multiscale inhomogeneous stiffness-driven model 基于多尺度非均匀刚度驱动模型的细丝缠绕复合材料套管爆裂压力精确预测

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-24 DOI: 10.1016/j.compstruct.2026.120060

Xing Mou, Qian Zhang, Guiming Zhang, Qiaoguo Wu, Jianhui Fu, Lichuan Zhou, Helin Pan, Lei Zu

The burst pressure prediction error for composite casing domes exceeded 20% when using the traditional homogeneous stiffness model (THSM), particularly in structures with large openings. This is primarily because the THSM neglects the pronounced heterogeneity in fiber volume fraction (FVF) and cannot adequately capture the complex failure modes in the composite casing dome region (CCDR). To overcome this limitation, an inhomogeneous stiffness-driven model (ISDM) was developed in this study, incorporating a multiscale modeling approach based on spatially variable FVF determined using 3D scanning reconstruction technology and the no-fiber-flux-change principle (NFFCP). The ISDM enables detailed analysis of stress distribution, damage initiation, and failure evolution by considering local stiffness variations within the CCDR. Compared to the THSM, the ISDM demonstrates significantly improved agreement with experimental stress–strain data and accurately captures the progressive failure modes observed in burst tests. The simulation results reveal that the FVF distribution strongly impacts localized stiffness, stress concentrations, and damage propagation paths, and the ISDM achieves a burst pressure prediction error of less than 3.0%, substantially outperforming the THSM. This research highlights the critical role of microstructural inhomogeneity in determining composite casing performance and introduces a precise and robust method for burst pressure prediction and failure analysis in filament-wound composite structures.

传统的均匀刚度模型（THSM）对复合套管圆顶的爆破压力预测误差超过20%，特别是在大开口结构中。这主要是因为THSM忽略了纤维体积分数（FVF）的明显非均质性，无法充分捕捉复合套管圆顶区域（CCDR）的复杂破坏模式。为了克服这一局限性，本研究开发了一种非均匀刚度驱动模型（ISDM），该模型结合了基于三维扫描重建技术和无纤维通量变化原理（NFFCP）确定的空间可变FVF的多尺度建模方法。ISDM通过考虑CCDR内部的局部刚度变化，可以详细分析应力分布、损伤起始和破坏演变。与THSM相比，ISDM与实验应力应变数据的一致性显著提高，并准确捕获了爆炸试验中观察到的渐进破坏模式。仿真结果表明，FVF分布对局部刚度、应力集中和损伤传播路径有较大影响，ISDM的破裂压力预测误差小于3.0%，大大优于THSM。本研究强调了微观组织不均匀性在决定复合材料套管性能中的关键作用，并介绍了一种精确、可靠的方法来预测细丝缠绕复合材料结构的破裂压力和失效分析。

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引用次数: 0

Research on dynamic mechanical behaviors and energy absorption characteristics of ceramsite-based foamed concrete composite 陶粒基泡沫混凝土复合材料动态力学行为及吸能特性研究

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-30 DOI: 10.1016/j.compstruct.2026.120087

Xiaohan Shi , Linlin Gu , Zhen Wang , Zirui Cheng , Junke Yang , Guokai Zhang , Fei Gao

As a new type of porous material, ceramsite-based foamed concrete composite (CFC) has been widely used in protection and other industries in recent years. To investigate the dynamic mechanical behavior, damage characteristics and energy absorption characteristics of CFC under impact loading, impact tests with strain rate of 115 s⁻¹∼200 s⁻¹ were carried out on CFC with different density and ceramsite content using separated Hopkinson pressure rod device (SHPB), and compared with a density grade of foam concrete (FC). A comprehensive comparative analysis was performed on the dynamic failure processes, damage characteristics, stress–strain responses, peak stresses, energy evolution, and fracture morphologies of the two materials. In addition, synchronized high speed imaging, scanning electron microscopy (SEM), and CT scanning were employed to further characterize the dynamic impact failure process and the microstructural features of CFC. The experimental results indicate that the incorporation of ceramsite lightweight aggregates into foamed concrete can increase the peak stress by 151% and the energy absorption density by 211%. Among all specimens, CFC800-50 exhibits the highest energy absorption density, reaching up to 1.60 MJ/m³. In practical engineering applications, CFC can achieve a balance between compressive load bearing capacity and energy absorption performance, making it well suited for protective structures dominated by explosion and impact loads.

陶瓷基泡沫混凝土复合材料（CFC）作为一种新型多孔材料，近年来在防护等行业得到了广泛的应用。为了研究冲击载荷作用下CFC的动态力学行为、损伤特性和能量吸收特性，采用分离式霍普金森压力棒装置（SHPB）对不同密度和陶粒含量的CFC进行了应变速率为115 ~ 200 s−1的冲击试验，并与密度等级的泡沫混凝土（FC）进行了对比。对两种材料的动态破坏过程、损伤特征、应力应变响应、峰值应力、能量演化和断裂形貌进行了全面的对比分析。此外，采用同步高速成像、扫描电镜（SEM）和CT扫描进一步表征了CFC的动态冲击破坏过程和微观组织特征。试验结果表明，在泡沫混凝土中掺入陶粒轻集料可使泡沫混凝土的峰值应力提高151%，能量吸收密度提高211%。CFC800-50的能量吸收密度最高，达到1.60 MJ/m3。在实际工程应用中，CFC可以实现抗压承载能力和吸能性能的平衡，非常适合于以爆炸和冲击荷载为主的防护结构。

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引用次数: 0

From static properties to fatigue life: comprehensive evaluation of unidirectional and woven flax fiber composites for structural applications 从静态性能到疲劳寿命：结构用单向和编织亚麻纤维复合材料的综合评价

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-07 DOI: 10.1016/j.compstruct.2026.120121

Paladugu Rakesh , Ujendra Kumar Komal , Nelson Muthu

The present study examines the structural integrity of flax/epoxy composites. Two laminate configurations, a unidirectional (UD) laminate and a woven bidirectional (BD) laminate, were fabricated using the VARTM process. The composites were characterized to evaluate their thermal, mechanical, and fatigue behaviour for structural applications. The crystallinity index obtained from XRD confirmed structural stability. Thermal analyses using TGA and DMA demonstrated that the composites can safely retain stiffness up to 50 °C, and the DMA frequency sweep showed negligible frequency dependence up to 20 Hz. Static tensile, flexural, and fatigue tests were conducted, and the results were normalized with respect to the fibre volume fraction along the loading direction. Tensile tests on the woven laminate were performed in both warp and weft directions, showing minimal directional dependence. Both laminates exhibited good fatigue resistance at 50 % of their ultimate stress levels. S-N curves were established, and a semi-logarithmic model provided the best fit to fatigue life. Stiffness degradation was quantified; in the UD laminate, a staircase-like stiffness reduction was observed during stage II degradation. Examination of fractured surfaces from tensile and fatigue specimens revealed fibre pull-out and matrix cracking in the off-axis direction as the dominant failure modes, along with striations in the fatigue-tested specimens.

本研究考察了亚麻/环氧复合材料的结构完整性。采用VARTM工艺制备了单向（UD）层压板和编织双向（BD）层压板两种层压板结构。对复合材料进行了表征，以评估其在结构应用中的热、力学和疲劳性能。XRD的结晶度指数证实了结构的稳定性。使用TGA和DMA进行的热分析表明，复合材料可以安全地保持高达50°C的刚度，并且DMA频率扫描显示高达20 Hz的频率依赖性可以忽略不计。进行了静态拉伸、弯曲和疲劳试验，并对沿加载方向的纤维体积分数进行了归一化。织物层压板的拉伸试验在经纱和纬纱两个方向上进行，显示出最小的方向依赖性。两种层压板在其极限应力水平的50%时均表现出良好的抗疲劳性能。建立了S-N曲线，采用半对数模型拟合疲劳寿命。对刚度退化进行量化；在UD层压板中，在II阶段降解期间观察到阶梯状刚度降低。对拉伸和疲劳试样断裂表面的检查显示，纤维拉出和离轴方向的基体开裂是主要的破坏模式，同时在疲劳测试试样中出现条纹。

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引用次数: 0

Analysis of magneto-mechanical coupling model and dynamic deformation characteristics of flexible magnetostrictive ribbon films considering fiber structure 考虑纤维结构的柔性磁致伸缩带膜磁-力耦合模型及动态变形特性分析

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-29 DOI: 10.1016/j.compstruct.2026.120110

Luyao Zhao , Huifang Liu , Jiaqi Wang , Yifei Gao , Chunye Hou , Cheng Li

To address the growing demand for magnetostrictive micro-nano structural materials that exhibit both high performance and flexibility, it is essential to analyze and design the dynamic driving characteristics of magnetostrictive fiber ribbon film, which is crucial for further enhancing its working capability. This paper innovatively presents a state-space model to characterize the dynamic magnetostrictive deformation of fiber ribbon films with various structural parameters under applied magnetic fields. For the first time, fiber structure is explicitly incorporated into the description of its electro-magnetic-mechanical dynamic behavior. Phase trajectory analysis reveals the stability boundary during the driving process, and time-domain characteristics under different magnetic fields are simulated. The results indicate that magnetostrictive performance improves with increasing driving current, leading to bifurcation behavior at the critical current of 0.9A. At this time, the film exhibits bistable characteristics, repeatedly transitioning between two stable equilibrium positions. This motion enables the accumulation and release of energy through potential well crossing, thus achieving large magnetostrictive deformation output. Finally, the output characteristics under varying frequencies and amplitudes of driving current are evaluated, with a maximum deformation of 208 μm under combined 3.1A bias and alternating current excitation. These findings provide a theoretical basis for designing high-output flexible magnetoelectric transducers.

为了满足人们对兼具高性能和柔韧性的磁致伸缩微纳结构材料日益增长的需求，分析和设计磁致伸缩纤维带膜的动态驱动特性是进一步提高其工作性能的关键。本文创新性地提出了一种状态空间模型来表征具有不同结构参数的纤维带膜在外加磁场作用下的动态磁致伸缩变形。首次将纤维结构明确地纳入其电磁力学动态特性的描述中。相位轨迹分析揭示了驱动过程中的稳定性边界，并模拟了不同磁场下的时域特性。结果表明，随着驱动电流的增大，磁致伸缩性能有所提高，在临界电流为0.9A时出现了分岔行为。此时，薄膜表现出双稳态特性，在两个稳定的平衡位置之间反复过渡。这种运动可以通过势井交叉积累和释放能量，从而实现大的磁致伸缩变形输出。最后，分析了驱动电流在不同频率和幅值下的输出特性，在3.1A偏置和交流励磁联合作用下，输出最大变形为208 μm。这些研究结果为设计高输出柔性磁电换能器提供了理论依据。

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引用次数: 0

Experimental investigation of concrete columns strengthened with perforated internal carbon fiber reinforced polymer tubes 内孔碳纤维增强聚合物管加固混凝土柱的试验研究

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.compstruct.2026.120114

Krzysztof Adam Ostrowski , Marcin Piechaczek , Oliwia Sikora

Fiber-reinforced polymer (FRP) composites have attracted significant attention in the strengthening of concrete structures because of their high mechanical efficiency and long-term durability relative to conventional materials. This study investigates a novel hybrid method of reinforcing self-compacting concrete (SCC) columns using internally placed perforated CFRP tubes and external CFRP confinement, also serves as lost formwork.

Axial compression tests were conducted to evaluate mechanical behavior, focusing on compressive strength, deformability, and stiffness. Four configurations were tested: unconfined specimens, internal-only reinforcement (I-series), external-only confinement (O-series), and combined internal-external reinforcement (hybrid O-1/I-1 and O-3/I-1). Holes (2.8 % surface area) were made in the CFRP tubes to improve the bond between core concrete and the external jacket.

The hybrid system (O-3/I-1) achieved the highest performance, increasing compressive strength by 104 % and deformability by 50 % compared to unconfined specimens. External confinement alone resulted in an 82 % strength increase and improved stiffness, while internal strengthening contributed to a 12–15 % increase in strength and provided sustained load-bearing capacity even after outer concrete cover had failed.

Analytical comparisons confirmed compatibility of test results with theoretical models. The findings highlight effectiveness of this composite technique for structural applications such as bridge piers and high-rise columns. Further research is recommended on factors like perforation geometry and column slenderness.

与传统材料相比，纤维增强聚合物（FRP）复合材料具有较高的力学效率和长期耐久性，在混凝土结构加固方面受到广泛关注。本研究探讨了一种新的混合方法，加强自密实混凝土（SCC）柱使用内部放置穿孔CFRP管和外部CFRP约束，也可作为丢失的模板。轴向压缩试验是为了评估力学行为，重点是抗压强度、变形能力和刚度。测试了四种配置：无约束试样、内部单独加固（i系列）、外部单独约束（o系列）和内外复合加固（O-1/I-1和O-3/I-1混合）。孔（2.8%的表面积）在CFRP管，以改善核心混凝土和外部护套之间的结合。混合系统（O-3/I-1）取得了最高的性能，与无侧限试样相比，抗压强度提高了104%，变形能力提高了50%。仅外部约束就能提高82%的强度和刚度，而内部加强则能提高12 - 15%的强度，即使在外部混凝土覆盖层失效后，也能提供持续的承载能力。分析比较证实了试验结果与理论模型的一致性。研究结果强调了这种复合技术在桥梁桥墩和高层柱等结构应用中的有效性。建议对射孔几何形状和柱长细等因素进行进一步研究。

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引用次数: 0

Enriched embedded-fiber crack-bridging element for XFEM fracture and pullout analysis of composites 复合材料XFEM断裂与拉拔分析的富集嵌入纤维裂缝桥接单元

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-31 DOI: 10.1016/j.compstruct.2026.120118

Hamid Bayesteh , Ahmad Jafari , Soheil Mohammadi

Embedded fiber elements are commonly employed in the finite element formulation to facilitate modeling of fibers in a matrix, without conforming fibers to matrix elements. This study aims to integrate the concept of embedded fiber element into the extended finite element (XFEM) framework to account for fiber bridging across crack surfaces. To this end, the XFEM concept has been expanded to enrich embedded fiber elements using the Heaviside function, alongside cracked matrix elements. Additionally, slipping between fiber and matrix is considered by supplementary degrees of freedom. The formulation also incorporates the pullout effects through the implementation of softening behavior between fiber and matrix. Validation of the proposed method is conducted against the available reference solutions. Its performance is further examined through a variety of single and multi-scale problems. The results demonstrate the mesh-independency of the proposed formulation across arbitrary mesh sizes and configurations, obviating the need for conformity between fiber and matrix elements which is a significant advancement for modeling fiber bridging in crack problems. Moreover, the developed formulation is capable of considering bi-direction or randomly distributed fibers with arbitrary orientations relative to the crack line. Furthermore, the proposed method is successfully employed in multsicale modeling of fiber composites.

在有限元公式中通常采用嵌入式纤维单元，以方便在矩阵中对纤维进行建模，而不需要将纤维与矩阵单元统一。本研究旨在将嵌入式纤维单元的概念整合到扩展有限元（XFEM）框架中，以解释纤维在裂纹表面上的桥接。为此，XFEM概念已经扩展到使用Heaviside函数来丰富嵌入纤维元素，以及裂纹矩阵元素。另外，纤维与基体之间的滑移用补充自由度来考虑。该配方还通过纤维和基体之间的软化行为实现了拉拔效应。根据现有的参考溶液对所提出的方法进行了验证。通过各种单尺度和多尺度问题进一步检验了其性能。结果表明，所提出的公式在任意网格尺寸和配置下具有网格无关性，从而避免了纤维和矩阵元素之间的一致性，这是裂缝问题中纤维桥接建模的重大进步。此外，所开发的公式能够考虑相对于裂纹线具有任意方向的双向或随机分布的纤维。此外，该方法还成功地应用于纤维复合材料的多尺度建模。

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引用次数: 0

Extended multiscale multi-patch isogeometric analysis for two-dimensional periodic piezoelectric structures based on penalty function method 基于罚函数法的二维周期压电结构扩展多尺度多片等几何分析

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-06 DOI: 10.1016/j.compstruct.2026.120142

Haozhi Li , Zhaowei Liu , Tiantang Yu , Leilei Chen

High-fidelity analysis of periodic piezoelectric structures is computationally prohibitive due to the complex electromechanical coupling and periodic microstructural heterogeneity. Isogeometric analysis (IGA) using single-patch modeling cannot efficiently handle complex topologies such as honeycombs or lattice structures. To overcome these challenges, this paper proposes an extended multiscale multi-patch isogeometric analysis (EMs-MPIGA) based on the penalty method for two-dimensional periodic piezoelectric structures. The non-uniform rational B-spline (NURBS) basis functions are employed for geometrical description and mechanical simulation of unit cells to obtain the numerical heterogeneity basis functions of piezoelectric problems. The equivalent matrices, including the stiffness, piezoelectric coupling, and dielectric system matrices of unit cells, are constructed using the computed heterogeneity basis functions. Additionally, downscaling computation is applied to obtain the displacement, electric potential, and von Mises stress of the unit cells. The accuracy, reliability, and robustness of the proposed method are validated via several multiscale simulations.

由于复杂的机电耦合和周期性微结构的非均质性，周期压电结构的高保真分析在计算上是难以实现的。使用单补丁建模的等几何分析（IGA）不能有效地处理复杂的拓扑结构，如蜂窝或晶格结构。为了克服这些挑战，本文提出了一种基于惩罚法的二维周期性压电结构扩展多尺度多片等几何分析（EMs-MPIGA）方法。采用非均匀有理b样条（NURBS）基函数对单元胞进行几何描述和力学模拟，得到压电问题的数值非均匀性基函数。利用计算得到的非均质基函数，构造了单元胞的等效矩阵，包括刚度矩阵、压电耦合矩阵和介电系统矩阵。此外，还采用降尺度计算获得了单元胞的位移、电势和冯米塞斯应力。通过多个多尺度仿真验证了该方法的准确性、可靠性和鲁棒性。

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引用次数: 0

Failure behavior of honeycomb sandwich structural batteries under three-point bending 蜂窝夹层结构电池三点弯曲失效行为研究

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

Composite Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-31 DOI: 10.1016/j.compstruct.2026.120117

Hanmo Zhou , Ruiyuan Zhang , Yilin Peng , Qingqing Wang , Xu Liu , Haowei Wu , Anchalee Duongthipthewa , Limin Zhou

Structural batteries that integrate energy storage and load-bearing functions are critical for lightweight design, yet existing designs using foam cores suffer from high density (≥100 kg/m³). This study introduces ultralight honeycomb sandwich structural batteries (HSSBs) using Nomex cores (48 kg/m³) embedded with lithium-ion polymer cells and systematically investigates their failure behavior under three-point bending. Three distinct failure modes were identified: global bending (Mode I) for thin cores (3 mm), core shear fracturing (Mode II) for thick rectangular configurations, and face wrinkling (Mode III) for thick annular configurations. Compared to baseline panels, HSSBs exhibit 20% average strength reduction but maintain remarkable electrochemical robustness with > 93% capacity retention after structural failure and negligible degradation during 10,000 bending cycles. A core thickness of 6 mm achieves optimal multifunctional efficiency (

η_{multi}

= 1.43), balancing 11.87 GPa bending modulus with 121.82 Wh/kg energy density. Thicker configurations exhibit progressive failure, sustaining approximately 80% of peak load post-failure—a valuable safety characteristic. Validated finite element models and a UAV cargo box demonstration establish a design framework for application-specific optimization of these high-performance structural batteries.

集成能量存储和承载功能的结构电池对于轻量化设计至关重要，但现有的泡沫芯设计存在高密度（≥100 kg/m3）的问题。本研究介绍了采用Nomex芯（48 kg/m3）嵌入锂离子聚合物电池的超轻型蜂窝夹层结构电池（hssb），并系统地研究了其在三点弯曲下的失效行为。确定了三种不同的破坏模式：薄岩心（3mm）的整体弯曲（模式I），厚矩形配置的岩心剪切破裂（模式II），厚环形配置的岩心表面起皱（模式III）。与基准板相比，HSSBs的平均强度降低了20%，但在结构破坏后仍保持了93%的电化学稳健性，在10,000次弯曲循环中可以忽略不计的退化。芯厚为6 mm的材料实现了最佳的多功能效率（η倍数= 1.43），平衡了11.87 GPa的弯曲模量和121.82 Wh/kg的能量密度。较厚的配置表现出渐进的故障，在故障后保持大约80%的峰值负载，这是一个有价值的安全特性。经过验证的有限元模型和无人机货箱演示为这些高性能结构电池的特定应用优化建立了设计框架。

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引用次数: 0