Design and Mechanical Performance of Triangular Function Density Gradient Skin Lattice Structures

doi:10.12068/j.issn.1005-3026.2025.20230274

Abstract

Abstract:

Based on the gyroid three period minimum surface （TPMS）， a sine function square and cosine function square density gradient skin lattice structure was proposed to address the problem of a relatively single gradient variation law in gradient lattice structures in current research. Titanium alloy （Ti-6Al-4V） sample was prepared using selective laser melting （SLM） technology. Finite element analysis and compression experiments were conducted on the sample to study its mechanical properties， and the error between the two results was less than 6.3%. Compared with the traditional linear density gradient skin lattice structures， the mechanical properties， deformation behavior， and energy absorption characteristics of the three structures were compared and analyzed. It was found that among the three structures， the cosine function square skin lattice structure had the best load-bearing performance， while the sine function square skin lattice structure had the strongest energy absorption capacity. By optimizing the internal relative density of the skin lattice structure， its mechanical properties and energy absorption capacity can be improved.

Key words: gyroid, three period minimum surface, density gradient, skin lattice structure, compression experiment

CLC Number:

TH164

Bo HAO, Yu-xin ZHAO, Xin-yan XU. Design and Mechanical Performance of Triangular Function Density Gradient Skin Lattice Structures[J]. Journal of Northeastern University(Natural Science), 2025, 46(3): 69-79.

Figures/Tables 22

References 19

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设计参数	物理意义
α，β，γ	控制晶胞大小的参数
R_G	相对密度参数，下标表示gyroid

设计参数	物理意义
α，β，γ	控制晶胞大小的参数
R_G	相对密度参数，下标表示gyroid

网格数	初次破坏载荷/kN	相邻数据误差/%	初次破坏位移/mm	相邻数据误差/%
769 962	11.756	—	0.883	—
1 072 809	11.985	1.95	0.901	2.04
1 912 849	12.114	1.08	0.912	1.22
2 530 455	12.02	0.84	0.919	0.77

网格数	初次破坏载荷/kN	相邻数据误差/%	初次破坏位移/mm	相邻数据误差/%
769 962	11.756	—	0.883	—
1 072 809	11.985	1.95	0.901	2.04
1 912 849	12.114	1.08	0.912	1.22
2 530 455	12.02	0.84	0.919	0.77

蒙皮点阵结构尺寸定义	数值
点阵结构的宽度	20
点阵结构的厚度	20
上、下面板质心间的距离	21
蒙皮点阵结构的长度	20
蒙皮厚度	1