基于增材制造空心点阵结构的压缩变形研究  

Research on Compression Deformation of Hollow Lattice Structure Based on Additive Manufacturing

作　　者：常超 马桢 褚井泉 侯建峰 张伟伟 CHANG Chao;MA Zhen;CHU Jingquan;HOU Jianfeng;ZHANG Weiwei(Department of Mechanics,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China;Shanxi Diesel Engine Industry Co.,Ltd.,Datong 037036,Shanxi,China)

机构地区：[1]太原科技大学应用科学学院力学系,山西太原030024 [2]山西柴油机工业有限责任公司,山西大同037036

出　　处：《高压物理学报》2022年第2期33-40,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11872261)。

摘　　要：点阵结构具有质量轻、承压性能好、比刚度大等特点,广泛应用于轻量化部件与承压结构。采用选区激光熔覆技术制备了316L不锈钢空心点阵结构,通过准静态压缩实验和有限元数值模拟,研究了含不同尺寸空心微柱的点阵结构在压缩变形时的失效和变形模式及其成因。结果表明:316L不锈钢材料的空心管状结构在点阵压缩过程中无明显压溃失稳,其结构失效模式是由节点失效诱发微柱变形,进而造成整体失效;结构的变形模式为整体均匀变形,但是当壁厚和外径较小时,边界层将因刚度不足而率先变形;增大空心微柱尺寸可使结构刚度增大。Lattice structure is widely used in lightweight components and pressure-bearing structures due to its light weight,good pressure-bearing performance,and high specific stiffness.In this study,a hollow lattice structure was manufactured by selected laser melting(SLM)technology.A combination of quasi-static compression experiment and finite element numerical simulation was used to study the failure and deformation modes of hollow lattice structures containing hollow micropillars with different sizes during compression deformation.It is shown that there is no obvious collapse and instability for the hollow lattice structure during the compression process.The failure of the node induces the deformation of the micropillars in structure,which in turn causes the overall failure.The deformation mode is uniform overall structure.However,when the wall thickness of hollow structure is small,the boundary layer will deform first due to insufficient rigidity.Increasing the size of the hollow tube could increase the rigidity of the structure.

关 键 词：增材制造 空心点阵结构 有限元 准静态压缩 

分 类 号：O341[理学—固体力学]