Improved compressive performance of lattice truss core sandwich composites with modified Kagome topologies: An experimental and numerical study

IF 3.5 3区材料科学 Q1 ENGINEERING, MECHANICAL

Journal of Sandwich Structures & Materials Pub Date : 2023-09-02 DOI:10.1177/10996362231197684

T. Dastan, R. Jafari Nedoushan, M. Sheikhzadeh, Woong‐Ryeol Yu

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引用次数: 0

Abstract

A finite element model (FEM) using a more realistic three-dimensional geometry of lattice truss core was proposed to simulate the flatwise compression test on lattice truss core sandwich composites (LTCSCs). The goal was to reduce the disparity between experimental results and FEM predictions without inclusion of imperfection, as oppose to similar studies. Besides, two modified Kagome topologies were suggested and fabricated by adding vertical composite struts at specific locations. Based on the experimental results, the modified Kagome topologies exhibited superior specific compressive stiffness and strength over the Kagome topology, by about 100%. In addition, facesheet rotation of Kagome topology was found by the FEM, which considerably affect its compressive performance. Facesheet rotation is caused by the arrangement of composite struts of LTCSC. Compressive response of LTCSC was acceptably predicted by the FEM, though there was quite high error for compressive stiffness and strength. Probable sources of discrepancy between experimental and FEM results were discussed.

查看原文本刊更多论文

改进Kagome拓扑结构的栅格桁架芯夹层复合材料压缩性能的实验与数值研究

提出了一种采用更为真实的格架芯三维几何结构的有限元模型来模拟格架芯夹层复合材料的平面压缩试验。目标是减少实验结果和FEM预测之间的差异，而不包括不完美，而不是类似的研究。此外，提出了两种改进的Kagome拓扑结构，并在特定位置添加垂直复合支撑。实验结果表明，改进后的Kagome拓扑结构比Kagome拓扑结构具有更高的比抗压刚度和强度，比Kagome拓扑结构高约100%。此外，通过有限元分析发现，Kagome拓扑的面板旋转对其抗压性能有较大影响。面板旋转是由LTCSC复合支撑的布置引起的。有限元法预测长轴混凝土的抗压响应是可以接受的，但抗压刚度和抗压强度误差较大。讨论了实验结果与有限元结果差异的可能来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Sandwich Structures & Materials 工程技术-材料科学：表征与测试

CiteScore

9.60

自引率

2.60%

发文量

审稿时长

7 months

期刊介绍： The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).