Thin-Walled Structures最新文献_第8页

Bolt-spliced connections with laminated unequal-section beams: Experimental, numerical, and analytical study for multi-story modular steel buildings 非等截面层压梁的螺栓连接：多层模块化钢结构的实验、数值和分析研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-20 DOI: 10.1016/j.tws.2025.114432

Si-Yuan Zhai , Ke Cao , Yan-Bo Wang , Yi-Fan Lyu , Guo-Qiang Li , Wei-Yong Wang , Chen Chen

In modular steel buildings (MSBs), prefabricated modules are rapidly assembled to achieve high construction efficiency. Considering that ceiling beams and floor beams within a module are usually designed with unequal sections due to their different load demands, this study analyzes such laminated unequal-section beams to better reflect the practical structural characteristics of MSBs. Full-scale tests were conducted on the inter-module connections to evaluate their serviceability; the force mechanism of these connections was further analyzed using refined finite element modeling. Ultimately, the design recommendation for multi-story modular structures using this connection configuration was presented. The results indicate that inter-module connections with laminated unequal-section beams exhibit satisfactory load-carrying properties and stable energy dissipation capacity. Beam flange fracture is identified as the dominant damage mode that controls the load behavior. Cyclic loading significantly reduces the ductility of the splice connections. Variations in axial compression ratio within experimental design parameters have no significant effect on the load-bearing capacity of the splice connections. Based on test and numerical analysis results, the design model was proposed to describe the bending characteristics of the splice connection. The provided design recommendation for modular structures can be conveniently applied to overall modular structures using this splice connection configuration. The results of this research offer a valuable point of reference for the engineering planning and development of MSBs.

在模块化钢结构建筑（MSBs）中，预制模块快速组装以实现高施工效率。考虑到模组内吊顶梁和楼板梁由于荷载需求不同，通常采用不等截面设计，因此本研究对这种不等截面叠合梁进行了分析，以更好地反映悬架结构的实际结构特点。对模块间连接进行了全面测试，以评估其适用性；采用精细有限元模型进一步分析了这些连接的受力机理。最后，对采用这种连接方式的多层模块化结构提出了设计建议。结果表明，采用不等截面叠合梁的模间连接具有良好的承载性能和稳定的耗能能力。梁翼缘断裂是控制荷载行为的主要损伤模式。循环荷载显著降低了接头连接的延展性。轴压比在试验设计参数范围内的变化对接头承载能力无显著影响。根据试验结果和数值分析结果，提出了描述接头弯曲特性的设计模型。所提供的模块化结构设计建议可以方便地应用于采用这种拼接连接方式的整体模块化结构。研究结果为中小企业的工程规划和发展提供了有价值的参考。

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引用次数: 0

Auxetic meta-concrete: advances, challenges, and future directions 增塑型元混凝土：进展、挑战和未来方向

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-20 DOI: 10.1016/j.tws.2025.114425

Thanh Son VO, Dong Joo KIM

In this work, we comprehensively review recent research on auxetic meta-concrete (AMC), with a focus on the mechanisms behind auxetic behavior, critical mechanical properties, and fabrication techniques, as well as engineering applications. AMC is characterized by a negative Poisson's ratio (NPR) and thus exhibits the counterintuitive behavior of lateral contraction under vertical compression and lateral expansion under vertical tension. This unique property enables an enhanced energy absorption capacity, recoverable elastic deformation, and improved impact resistance, which makes AMC an effective option for protective infrastructure. The auxetic behavior of AMC is attributed to its geometric features and constituent materials. Among the geometries investigated thus far, peanut-shaped structures that effectively reduce stress concentrations have demonstrated the most significant auxetic effect, with an NPR of −1.25, and the highest specific energy absorption at 0.3879 J/g. Adopting rotating rigid-body geometries has successfully improved stiffness and load-transfer capacity to achieve the highest second-peak stress values of 15.4 MPa. Buckling-induced structures provide an optimal balance of auxeticity and stiffness, with an NPR of −1 and the highest specific stiffness of 487.1 J/g. Moreover, AMC using ultra-high-performance fiber-reinforced concrete exhibits superior mechanical properties, reaching a first-peak stress of 5.22 MPa. Despite these promising characteristics, challenges remain in mold fabrication and balancing stiffness with auxetic behavior, which limits scalability. This review consolidates existing research, identifies critical knowledge gaps, and proposes some directions for future research to support the development of AMC as a multifunctional and high-performance material for next-generation construction.

在这项工作中，我们全面回顾了近年来关于失活混凝土（AMC）的研究，重点关注失活行为背后的机制、关键力学性能、制造技术以及工程应用。AMC具有负泊松比（NPR）的特征，在垂直压缩下表现为侧向收缩，在垂直拉伸下表现为侧向膨胀的反直觉行为。这种独特的性能增强了AMC的能量吸收能力、可恢复的弹性变形和抗冲击性，使其成为保护基础设施的有效选择。材料的几何特性和组成材料决定了材料的消长性能。在目前所研究的几何结构中，花生形结构有效降低应力集中，表现出最显著的生长性效果，其NPR为- 1.25，比能吸收最高，为0.3879 J/g。采用旋转刚体几何结构，成功地提高了刚度和载荷传递能力，实现了最高次峰应力值15.4 MPa。屈曲诱导结构提供了最佳的弹性和刚度平衡，其NPR为−1，最高比刚度为487.1 J/g。超高性能纤维增强混凝土AMC表现出优异的力学性能，首峰应力达到5.22 MPa。尽管这些有前途的特性，挑战仍然存在于模具制造和平衡刚度与auxetic行为，这限制了可扩展性。这篇综述整合了现有的研究，确定了关键的知识差距，并提出了未来研究的一些方向，以支持AMC作为下一代建筑的多功能高性能材料的发展。

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引用次数: 0

Deformation reconstruction of orthotropic plates based on modified couple stress theory 基于修正偶应力理论的正交各向异性板变形重建

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-20 DOI: 10.1016/j.tws.2025.114435

Xingjian Cao , Qiuyue Feng , Yanhao Guo , Jingli Du , Hong Bao

Conventional inverse Finite Element Methods (iFEM) face bottlenecks of insufficient accuracy and compatibility defects in reconstructing in-plane deformations of orthotropic plates. This paper presents, for the first time, a novel inverse Finite Element Method termed (inverse Unsymmetric Quadrilateral 4-node element) iUSQ4, which integrates the Modified Couple Stress Theory (MCST). By introducing real analytical trial functions, we construct stress-couple stress fields that satisfy the governing equations of orthotropic plane strain problems, fundamentally resolving the deformation compatibility issue. Combined with the penalty function method, a four-node quadrilateral element with 12 degrees of freedom is designed. Through a stress-driven collaborative interpolation mechanism and a weighted least-squares variational model, high-precision displacement field reconstruction is achieved under sparse/irregular Fiber Bragg Gratings (FBG) sensor layouts. Both numerical simulations and experimental results demonstrate that the reconstructed displacement accuracy can be improved by up to 35 % compared to traditional iFEM, validating the stability and precision of the proposed method. Consequently, the proposed approach provides a reliable and efficient tool for shape sensing and structural health monitoring of thin-walled structures in aerospace, marine engineering, and civil engineering.

传统的逆有限元方法在重建正交各向异性板的面内变形时存在精度不足和相容性缺陷等瓶颈。本文首次提出了一种结合修正偶联应力理论（MCST）的反有限元方法，称为逆非对称四边形四节点单元（inverse Unsymmetric Quadrilateral 4-node Element） iUSQ4。通过引入实解析试函数，构造了满足正交各向异性平面应变问题控制方程的应力偶应力场，从根本上解决了变形协调问题。结合罚函数法，设计了一个12自由度的四节点四边形单元。通过应力驱动协同插值机制和加权最小二乘变分模型，实现了稀疏/不规则光纤光栅（FBG）传感器布局下的高精度位移场重构。数值模拟和实验结果表明，与传统有限元法相比，重构位移精度可提高35%，验证了所提方法的稳定性和精度。因此，所提出的方法为航空航天、海洋工程和土木工程中薄壁结构的形状传感和结构健康监测提供了可靠和有效的工具。

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引用次数: 0

A comparative study of gradient designs in bioinspired tree-like fractal energy absorbers under axial and oblique loads 轴向和斜向载荷下生物启发树形分形吸能器梯度设计的比较研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-19 DOI: 10.1016/j.tws.2025.114428

Lun Wang, Yong Zhang, Wenzhen Huang, Muhong Jiang, Xuanzhong Zheng, Sipei Cai

The energy absorption performance of traditional fractal structures is limited under oblique loads. Although gradient design provides a solution to this problem, the optimal strategy remains unclear due to the lack of comparison among different gradient designs. This paper introduces three types gradient bionic fractal structures, namely the tree-like fractal radial gradient structures (TFGS-S_r, TFGS-P_r), the tree-like fractal axial gradient structures (TFGS-S_a, TFGS-P_a), the tree-like fractal bidirectional gradient structures (TFGS-S_d, TFGS-P_d). Their crushing behaviors are investigated by experiment and numerical analysis under different load angles. The results indicate that the improvement of specific energy absorption (SEA) is not significant for both the axial and bidirectional gradient designs when compared to the uniform thickness TFGS-P_u. However, the TFGS-P_r with radial gradient design has a 41.5% higher specific energy absorption at 30° load angle compared to the uniform thickness, and the radial gradient design can enhance the ability of the uniform thickness structure to resist overall bending instability under large load angles. Further parametric studies show that increasing the radial gradient coefficient G and the fractal order N can significantly enhance the crashworthiness of TFGS-S and TFGS-P under axial and oblique loads. Additionally, when the fractal angle α = 45° and the fractal position δ = 0.5, the energy absorption effect is the best. The parameter-optimized TFGS-P_r withstands larger impact angles and demonstrates superior specific energy absorption compared to other typical biomimetic structures under equal mass conditions, maintaining a SEA of 16.8 kJ/kg even at 40°, making it highly promising for energy absorption applications.

传统分形结构在斜荷载作用下的吸能性能受到限制。虽然梯度设计为这一问题提供了解决方案，但由于缺乏对不同梯度设计的比较，其最优策略尚不明确。本文介绍了三种梯度仿生分形结构，即树状分形径向梯度结构（TFGS-Sr、TFGS-Pr）、树状分形轴向梯度结构（TFGS-Sa、TFGS-Pa）、树状分形双向梯度结构（TFGS-Sd、TFGS-Pd）。通过实验和数值分析研究了不同载荷角度下的破碎行为。结果表明，与均匀厚度的TFGS-Pu相比，轴向和双向梯度设计对比能吸收（SEA）的改善并不显著。而径向梯度设计的TFGS-Pr在30°载荷角时比均厚结构的比能吸收提高了41.5%，径向梯度设计可以增强均厚结构在大载荷角下抵抗整体弯曲失稳的能力。进一步的参数化研究表明，增加径向梯度系数G和分形阶数N可以显著提高TFGS-S和TFGS-P在轴向和斜向载荷下的耐撞性。当分形角α = 45°，分形位置δ = 0.5时，吸能效果最好。与其他典型的仿生结构相比，经过参数优化的TFGS-Pr在相同质量条件下可以承受更大的冲击角度，并表现出更好的比能吸收，即使在40°时也能保持16.8 kJ/kg的SEA，这使其在能量吸收应用中具有很大的前景。

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引用次数: 0

The load-bearing capacity of cold-formed steel back-to-back built-up columns with local buckling at elevated temperatures 高温局部屈曲冷弯型钢背靠背组合柱的承载能力

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-19 DOI: 10.1016/j.tws.2025.114431

Jingjie Yang , Fengzuo Yan , Jie Zheng , Jinfu Xu , Min Huang , Kai Luo , Yuye Xu , Haifeng Li

This paper presents a study on the load-bearing capacities of cold-formed steel back-to-back built-up columns (CFS-BBC) experiencing local buckling at elevated temperatures. Steady-state tests, numerical simulations, and parametric analyses were conducted. The test results indicated that the CFS-BBC had about 23% and 50% loss of load-bearing capacity when temperature reached 400 °C and 600 °C, respectively. Parametric analyses revealed that cold-work hardening effects and screw spacing had limited influence on the load-bearing capacity, whereas initial imperfections significantly affected it. The local imperfection applied to the numerical model was recommended to be 1% web width in the absence of a measurement. Based on parametric analyses, the direct strength method (DSM) was found to be unconservative in predicting the load-bearing capacity of CFS-BBC at elevated temperatures. Therefore, a modified DSM was proposed to provide more accurate and reliable predictions, with reliability analyses demonstrating the advantages of the proposed method.

本文研究了冷弯型钢背靠背组合柱（CFS-BBC）在高温下局部屈曲的承载能力。进行了稳态试验、数值模拟和参数分析。试验结果表明，当温度达到400℃和600℃时，CFS-BBC的承载能力分别损失约23%和50%。参数分析表明，冷加工硬化效应和螺杆间距对承载能力的影响有限，而初始缺陷对承载能力有显著影响。在没有测量的情况下，应用于数值模型的局部缺陷建议为1%的腹板宽度。通过参数分析，发现直接强度法（DSM）对CFS-BBC在高温下的承载力预测具有非保守性。因此，提出了一种改进的DSM，以提供更准确和可靠的预测，可靠性分析表明了该方法的优势。

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引用次数: 0

Structural strengthening of steel channel columns using low-modulus CFRP fabrics 采用低模量CFRP布对钢槽柱进行结构加固

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-19 DOI: 10.1016/j.tws.2025.114429

Sivaganesh Kanmani Selvaraj , Mahendrakumar Mathialagu Madhavan

In the absence of explicit design guidelines for carbon fiber reinforced polymer (CFRP) strengthened steel structures, this study (i) investigates the feasibility of using lightweight, low-modulus fabric-form CFRP for strengthening singly symmetric channel bracing members under compression, and (ii) develops design limit states based on observed failure modes. To accomplish these objectives, a total of 42 column tests were conducted using three CFRP strengthening methods across four different slenderness ratios. The observed failure modes include CFRP crushing accompanied by steel yielding in low-slenderness columns (21–42.01) and CFRP wrinkling due to global buckling in high-slenderness columns (63.03–79.83). The results demonstrate that the lightweight, low-modulus fabric-form CFRP can effectively enhance the column’s axial load-carrying capacity by up to 27%. Based on a detailed analysis of the failure modes with respect to column slenderness, a set of design limit states is proposed for design strength prediction. A design example is presented to demonstrate the practical application of the proposed method for structural design engineers.

在缺乏明确的碳纤维增强聚合物（CFRP）加强钢结构设计指南的情况下，本研究(i)调查了使用轻质、低模量织物形式CFRP加强受压下单对称通道支撑构件的可行性，（ii）根据观察到的破坏模式开发设计极限状态。为了实现这些目标，使用三种碳纤维增强方法在四种不同的长细比下进行了总共42个柱试验。观察到的破坏模式包括低长细柱中CFRP破碎伴随钢材屈服（21-42.01）和高长细柱中CFRP整体屈曲起皱（63.03-79.83）。结果表明，轻量化、低模量纤维型CFRP可有效提高柱的轴向承载能力达27%。在详细分析柱长细比破坏模式的基础上，提出了一套用于设计强度预测的设计极限状态。最后以一个设计实例说明了该方法对结构设计工程师的实际应用。

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引用次数: 0

Meso-scale simulation of cross-ply UHMWPE composite laminates under general out-of-plane compressive loading 一般面外压缩载荷作用下交叉铺层超高分子量聚乙烯复合材料层合板的细观模拟

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-18 DOI: 10.1016/j.tws.2025.114415

Chun-Zheng Zhao , Feng Jin , Jian-Hong Zhang , Lu-Sheng Qiang , Xin Wang , Chang-Ye Ni , Rui Zhang , Tian Jian Lu

With an exceptional combination of low density and mechanical properties, cross-ply ultra-high molecular weight polyethylene (UHMWPE) composite laminates are increasingly exploited in civil engineering and armor protection systems, yet the design and analysis of such composite structures necessitate the development of efficient simulation tools that can optimally balance computational efficiency with predictive accuracy. Building upon our prior micro-scale FE model, a new meso‑scale approach is developed for simulating larger-sized cross-ply UHMWPE laminates. This innovative meso‑scale model accurately captures the fiber-scale deformation and failure mechanisms of composites while maintaining high computational efficiency. The validity of the proposed meso‑scale numerical methodology has been thoroughly validated by comparing it against extensive experimental data, including quasi-static compression, indentation, drop-weight impact, and ballistic impact tests, with remarkable agreement across all simulations. Compared to traditional homogenization models, the meso‑scale model significantly improves the resolution in predicting the mechanical response and deformation processes of composites. The new model also overcomes their shortcoming of overlooking internal composite structures and provides new insights into the anisotropic deformation mechanisms of fibers and resins under general out-of-plane loadings. This work represents a novel implementation of a meso‑scale numerical model specifically developed for the design and optimization of cross-ply UHMWPE composite laminates, offering significant advancements in the simulation and analysis of protective structures made of advanced composite materials.

交叉层合超高分子量聚乙烯（UHMWPE）复合层压板具有低密度和机械性能的优异组合，在土木工程和装甲防护系统中得到越来越多的应用，但这种复合结构的设计和分析需要开发高效的仿真工具，以最佳地平衡计算效率和预测精度。在我们之前的微观尺度有限元模型的基础上，开发了一种新的中尺度方法来模拟较大尺寸的交叉层合超高分子量聚乙烯层压板。这种创新的中尺度模型准确地捕获了复合材料的纤维尺度变形和破坏机制，同时保持了较高的计算效率。通过将所提出的中尺度数值方法与大量实验数据（包括准静态压缩、压痕、落锤冲击和弹道冲击试验）进行比较，彻底验证了其有效性，所有模拟结果都非常一致。与传统的均质化模型相比，中尺度模型在预测复合材料的力学响应和变形过程方面显著提高了分辨率。新模型还克服了它们忽略复合材料内部结构的缺点，为研究纤维和树脂在一般面外载荷下的各向异性变形机制提供了新的见解。这项工作代表了专门为设计和优化交叉层合超高分子量聚乙烯复合材料层压板而开发的中尺度数值模型的新实现，在模拟和分析由先进复合材料制成的防护结构方面取得了重大进展。

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引用次数: 0

Failure analysis of open-hole composite laminated plates based on a novel synergistic multi-scale strategy 基于新型协同多尺度策略的开孔复合材料层合板失效分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-18 DOI: 10.1016/j.tws.2025.114426

Jie Mei , Li Mei , Jiaxin Deng , Shengbo Ling

The failure behavior of composite laminated plates exhibits complex multi-scale characteristics that are challenging to capture, while current multi-scale models face significant limitations. This study proposes a novel synergistic multi-scale strategy to accurately and efficiently capture the failure behavior of composite laminated plates. The computational efficiency of the proposed synergistic multi-scale strategy is enhanced through the following two key measures. For the first measure, a higher-order shear deformation theory and the related refined triangular finite element are constructed to predict the macro-stress of composite laminated plates. Therefore, the composite laminated plates can be simulated by a small number of refined triangular elements instead of lots of three-dimensional elements, and the mesh quantity of the macro-model is decreased significantly. For the second measure, the three-dimensional finite element model in the mesoscale is called by the macro-model for linear elastic simulation, and the failure elements in the meso‑model are checked according to the meso‑stresses. Besides, the failure elements in the meso‑model are recorded by the macro-model, so the nonlinear damage iterations in the meso‑model are avoided. Moreover, the quasi-static tensile experiments are carried out for the open-hole composite laminated plates with three layering schemes, and the experimental results are compared with the predictions of the proposed synergistic multi-scale strategy to evaluate its performance. The current results indicate that the proposed synergistic multi-scale strategy can accurately and efficiently predict the failure behavior of open-hole composite laminated plates, and the proposed strategy can serve as an alternative choice for the design of composite laminated plates.

复合材料层合板的破坏行为表现出复杂的多尺度特征，而现有的多尺度模型面临着很大的局限性。本研究提出了一种新的协同多尺度策略来准确有效地捕捉复合材料层合板的破坏行为。本文提出的协同多尺度策略通过以下两个关键措施提高了计算效率。对于第一种方法，建立了高阶剪切变形理论和相应的精细三角有限元来预测复合材料层合板的宏观应力。因此，复合材料层合板可以用少量的精细三角形单元来模拟，而不是大量的三维单元，并且大大减少了宏观模型的网格数量。第二种方法是将线弹性模拟的宏观模型称为中尺度三维有限元模型，并根据细观应力对中尺度模型中的破坏单元进行校核。此外，细观模型中的破坏元素由宏观模型记录，避免了细观模型中的非线性损伤迭代。此外，对三种铺层方案下的开孔复合材料层合板进行了准静态拉伸实验，并将实验结果与所提出的协同多尺度策略的预测结果进行了比较，以评价其性能。研究结果表明，所提出的协同多尺度策略能够准确有效地预测开孔复合材料层合板的破坏行为，可作为复合材料层合板设计的一种替代选择。

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引用次数: 0

Towards accurate simulation of variable stiffness composites: a refined model bridging macro-micro defects and structural performance 面向变刚度复合材料的精确模拟：连接宏观-微观缺陷和结构性能的精细模型

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-18 DOI: 10.1016/j.tws.2025.114421

Xianzhao Xia , Lei Zu , Guiming Zhang , Helin Pan , Honghao Liu , Qian Zhang , Jianhui Fu , Qiaoguo Wu , Lichuan Zhou , Xiaolong Jia

Variable Stiffness Composites (VSC) expands the design space for improving the structural performance of composites while reducing costs. This study investigates the formation process of overlap and gap defects in variable stiffness composites laminates, and improves and optimizes existing modeling methods through parameterized modeling. By refining the number of elements in different directions for each ply, the model considers the equivalent material properties of overlaps, gaps, and varying thicknesses. A micro-scale model of composite materials is established, analyzing the impact of fiber angle deviation on the strength ratio coefficient. Additionally, the study incorporates thickness distribution to correct the strength reduction distribution. A finite element model (FEM) for variable stiffness laminated composites is established, and its damage failure modes and load-bearing capacity under tensile loads are investigated. Finally, the FEM and modeling method are verified through tensile tests on the variable stiffness laminated composites. In this study, a new fine modeling approach for VSC laminated structures is proposed, which takes into account the factors such as fiber angle differences in the ribbon width direction, thickness variation, and strength reduction due to fiber curvature. The modeling method can provide a detailed modeling method for the structural design of variable stiffness composite placement.

变刚度复合材料（VSC）在降低成本的同时，扩大了提高复合材料结构性能的设计空间。研究变刚度复合材料层合板的重叠缺陷和间隙缺陷的形成过程，通过参数化建模对现有建模方法进行改进和优化。通过细化每层不同方向上的元素数量，该模型考虑了重叠、间隙和不同厚度的等效材料特性。建立了复合材料的微观模型，分析了纤维角偏差对复合材料强度比系数的影响。此外，该研究还纳入了厚度分布，以纠正强度折减分布。建立了变刚度层合复合材料的有限元模型，研究了变刚度层合复合材料在拉伸载荷作用下的损伤破坏模式和承载能力。最后，通过变刚度层合复合材料的拉伸试验，验证了有限元方法和建模方法。本文提出了一种考虑带宽度方向纤维角度差异、厚度变化和纤维曲率导致的强度降低等因素的VSC层合结构精细建模新方法。该建模方法可为变刚度复合材料布局结构设计提供详细的建模方法。

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引用次数: 0

Nodal geometry optimization in additively manufactured thin lattice structures: Application to the design of lightweight Ti–6Al–4V LPBF metamaterials 增材制造薄晶格结构的节点几何优化：在轻量化Ti-6Al-4V LPBF超材料设计中的应用

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-12-18 DOI: 10.1016/j.tws.2025.114414

M. Casata, C. Garrido, T. Wilkinson, S. Perosanz, D. Barba

In recent years, the increasing use of additive manufacturing has enabled the development of metamaterials, such as lattice structures, which provide high strength-to-weight ratios and energy absorption capabilities. However, lattice structures have a flaw: the sharp intersections at the nodes act as stress concentrators, resulting in reduced mechanical properties. To avoid this, several approaches to modify the nodal geometry are known, such as nodal filleting or spherical joints. However, there is a lack of a systematic, generalizable understanding of the impact on nodal geometry and how to design it for optimal mechanical properties, backed by experimental work. This work investigates, at fixed relative densities, combining both experimental and computational approaches, the effect of node rounding on the mechanical performance of different unit cells. With this aim, the study initially focuses on analyzing the effect of node rounding on the mechanical properties of BCC cellular structures at two relative density levels (low at

\approx

3% and high at

\approx

24%). The constant relative density requirement is achieved through increasing fillet radii while decreasing strut diameters for each relative density. The results show increases of the elastic modulus ranging 50.4–103.5%, and 26.4–45.7% in the yield strength, showing a lower impact of the nodal geometry at lower relative densities. Finally, the study is generalized to other unit cells (simple cubic). The approach developed in this work reveals design indicators correlated with the mechanical performance of node-reinforced cellular metamaterials and enables exploration of a broader design space to optimize lattice structures for specific properties.

近年来，随着增材制造技术的日益普及，晶格结构等超材料的发展成为可能，这些材料具有高强度重量比和能量吸收能力。然而，晶格结构有一个缺陷：节点处的尖锐交叉点充当应力集中点，导致力学性能降低。为了避免这种情况，有几种修改节点几何形状的方法，例如节点圆角或球面关节。然而，在实验工作的支持下，缺乏对节点几何形状的影响以及如何设计最佳机械性能的系统，可推广的理解。本研究在固定相对密度下，结合实验和计算方法，研究了节点舍入对不同单元胞力学性能的影响。为此，该研究最初侧重于分析在两种相对密度水平（低≈3%和高≈24%）下，节点舍入对BCC细胞结构力学性能的影响。恒定的相对密度要求是通过增加圆角半径而减小每个相对密度的支柱直径来实现的。结果表明：弹性模量增加50.4 ~ 103.5%，屈服强度增加26.4 ~ 45.7%，表明低相对密度下节点几何形状对屈服强度的影响较小；最后，将研究推广到其他单位胞（简单立方）。这项工作中开发的方法揭示了与节点增强细胞超材料的机械性能相关的设计指标，并使探索更广泛的设计空间来优化特定性能的晶格结构成为可能。

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引用次数: 0