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| Study on Mechanical Response of Selective Laser Melted Nickel-Titanium Based Pentamode Metamaterials |
| ZHANG Lei1 , WEI Shuaishuai1 , SONG Bo1 , LI Jingyang2 , ZHANG Jianchao2 , QI Junfeng2 , SHI Yusheng1 |
1. Huazhong University of Science and Technology, Wuhan 430074, China;
2. Beijing Satellite Manufacturing Factory Co., Ltd., Beijing 100094, China |
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Abstract Pentamode metamaterials (PMs) have uncoupled relative density and mechanical properties, which have potential applications in the field of special acoustic equipments and biological implants. Selective laser melting (SLM) technology has the ability to form complex and fifine lattice metamaterials, which can achieve customized stiffffness, controllable cell topology, cell size and porosity. In this work, nickel-titanium shape memory alloy (NiTi SMA) powder was used to fabricate pentamode metamaterials with difffferent topological shapes by selective laser melting. The observation results of micro-morphology show that the nickel-titanium based pentamode metamaterials formed by SLM has good manufacturing fifidelity. The fifinite element simulation is used to predict the stress distribution in the compression process of the pentamode metamaterial, and it is found that the stress is concentrated in the joint of the struts. The experimental results of compression mechanics show that the strength of NiTi based pentamode metamaterial increases with the increase of relative density. By establishing the mathematical models of relative density, relative modulus and strength, the mechanical properties of pentamode metamaterials with difffferent relative densities can be well predicted.
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2022, 
