梯度极小曲面点阵结构力学特性研究  

Influence of gradient design on mechanical properties of Gyroid lattice structures

作　　者：杨磊[1,2] 郑浩 张聪[1] 闫春泽[2] YANG Lei;ZHENG Hao;ZHANG Cong;YAN Chunze(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉理工大学交通与物流学院,湖北武汉430063 [2]华中科技大学材料科学与工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2022年第12期64-69,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年科学基金资助项目(52105396)。

摘　　要：基于螺旋(Gyroid)型极小曲面点阵结构,设计包括两种线性渐变和两种矩阵渐变的四种梯度结构,通过实验及有限元分析方法分析了梯度设计对Gyroid型极小曲面点阵结构力学特性的影响.结果表明:通过激光选区熔化制备的样品致密度均在98%以上,具有极高的制备精度和可重复性;压缩实验表明四种梯度结构的变形过程一致,均是结构整体坍塌;与均匀结构对比,梯度结构的弹性模量提高了10%,10%-20%-10%梯度设计结构的累计能量吸收值最大.此外,对结构进行了有限元仿真,结果表明压缩过程中应力集中发生在转角处.The effects of gradient design on the mechanical properties of Gyroid-type minimal surface lattice structures were analyzed through experiments and finite element analysis. The results show that the densification of the samples prepared by selective laser melting are all above 98%,with extremely high manufacturing accuracy and repeatability.Compression experiments show that the deformation process of the four gradient structures is consistent,all show the whole collapse properties. Compared with the uniform structure,Young’s modulus of the gradient structure is increased by 10%,and the cumulative energy absorption value of the 10%-20%-10% gradient design structure is the largest. In addition,finite element simulation of the structure shows that stress concentration occurs at the corners during compression.

关 键 词：点阵结构 梯度设计 力学特性 有限元 矩阵渐变 线性渐变 

分 类 号：TB34[一般工业技术—材料科学与工程]