激光选区熔化增材制造三维双V蜂窝机械超材料及其压缩力学响应

Selective Laser Melting of 3D Honeycomb Mechanical Metamaterials With“Double V”Configurations and Compressive Responses

机械超材料(Mechanical metamaterials,MMMs)具有轻量化、高强度、高能量吸收等特点,已经成为航空航天、能源汽车、制造业、军事等领域的研究热点。激光选区熔化(Selective laser melting,SLM)增材制造技术可以成形复杂的微观结构,具有较高的精度和分辨率,适用于复杂金属机械超材料成形。提出了一种基于双V单元拓扑的3D机械超材料设计方案,采用SLM技术成形了不同构型的三维双V蜂窝机械超材料,通过理论计算、仿真模拟和试验结合探究了各项结构参数对三维双V蜂窝机械超材料压缩力学响应的影响,实现了可调节的负泊松比机械特性。

Mechanical metamaterials(MMMs)have become a research hotspot in the application of aerospace,energy automobile,manufacturing,and military due to their light weight,high strength,and high energy absorption.Selective laser melting(SLM)additive manufacturing can produce complex microstructure with high precision and resolution,thus being suitable to fabricate complex MMMs.In this study,a design scheme of three-dimensional(3D)MMMs models based on a“double V”configuration honeycomb topology was proposed,which were subsequently printed by SLM.Through the combination of theoretical calculation,simulation,and experiments,the influences of various structural parameters on the compression mechanical response of the“double V”configuration honeycomb MMMs were investigated.The findings provide an approach to manually tailor the negative Poisson’s ratio of MMMs.