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Study on mechanical properties of honeycomb pentamode structures fabricated by laser additive manufacturing: Numerical simulation and experimental verification

机译：激光增材制造蜂窝五模结构力学性能的数值模拟与实验验证

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摘要

In this work, the structural design of mimicking the fluids, the morphological characteristics, stress distributions predicted by finite element (FE) method, mechanical properties and deformation mechanisms of pentamode materials (PMs) were systematically investigated. We proposed a two-steps optimization strategy to rationally design PM structures and the dispersion curves confirmed the obtained structural parameters. The designed PM structures made of Ti-6Al-4V powder were fabricated by selective laser melting (SLM). Besides, due to the slight deviations between the SLM-built PM structures and the designed ones, a modified FE model was used to predict the stress distributions and mechanical properties. Furthermore, from quasi-static compression tests, we find that as the strut widths increase, the deformation mechanism of PM structures transfers from plastic to brittle fracture resulting from the size effect, which indicates that PM structures would have a good elastic nature of buckling when the width of struts is small. The critical width of struts of plastic-to-brittle transition was estimated as 0.12 mm. This work would pave the way to structural design and customized mechanical properties of honeycomb pentamode metamaterials.
机译：在这项工作中，系统地研究了模拟流体的结构设计，形态特征，有限元（FE）方法预测的应力分布，五模材料（PMs）的力学性能和变形机理。我们提出了两步优化策略来合理设计PM结构，色散曲线证实了所获得的结构参数。通过选择性激光熔化（SLM）制作了由Ti-6Al-4V粉末制成的设计PM结构。此外，由于SLM建造的PM结构与所设计的PM结构之间存在细微的偏差，因此使用改进的FE模型来预测应力分布和力学性能。此外，从准静态压缩试验中我们发现，随着支杆宽度的增加，PM结构的变形机理由尺寸效应导致从塑性转变为脆性断裂，这表明PM结构在屈曲时具有良好的屈曲弹性。撑杆的宽度很小。塑性到脆性过渡的支撑杆的临界宽度估计为0.12 mm。这项工作将为蜂窝五模式超材料的结构设计和定制的机械性能铺平道路。

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