SLM成形梯度体积分数镍钛合金Gyroid点阵结构  

Gradient volume fraction Ni-Ti alloy Gyroid lattice structure fabricated by SLM

作　　者：李毅[1] 王晓强 陈志桥 周燕[2,3] 文世峰 史玉升[1] LI Yi;WANG Xiaoqiang;CHEN Zhiqiao;ZHOU Yan;WEN Shifeng;SHI Yusheng(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;National Digital Construction Technology Innovation Center,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]华中科技大学土木与水利工程学院,武汉430074 [3]国家数字建造技术创新中心,武汉430074

出　　处：《中国有色金属学报》2025年第4期1179-1194,共16页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2023YFB4603300);国家自然科学基金资助项目(52275332,52274400)。

摘　　要：通过选区激光熔化技术成形的点阵结构因其优异的抗冲击性能和能量吸收性能在航空航天、机械装备和生物医学等领域受到广泛关注。在本工作中,采用选区激光熔化(SLM)技术制备了不同体积分数的均质和梯度sheet型Gyroid点阵结构,利用有限元模拟对Gyroid点阵结构的成形精确度、压缩特性及其在受压变形过程中的应力分布进行了系统研究。结果表明:该点阵结构的压缩曲线可以分为三个阶段,即弹性变形阶段、弹塑性变形阶段和结构逐层失效阶段;随着体积分数的增大,SLM成形梯度sheet型Gyroid点阵结构吸收总能量增加,Gyroid点阵结构的压缩模量和屈服强度也逐渐增大;在压缩载荷作用下,均质和梯度sheet型Gyroid点阵结构的应力主要集中于倾斜曲面间的连接区域;随着梯度点阵结构局部体积分数梯度减少,应力集中更加严重;随着梯度点阵结构梯度范围增大,梯度点阵结构形成的应力梯度区间增大;均质和梯度sheet型Gyroid点阵结构压缩断裂行为均为脆性断裂。The lattice structure formed by selective laser melting technology has attracted wide attention in the fields of aerospace,mechanical equipment and biomedicine due to its excellent impact resistance and energy absorption performance.In this work,homogeneous and gradient sheet-type Gyroid lattice structures with different volume fractions were prepared by selective laser melting technology.The forming accuracy,compression characteristics and stress distribution of Gyroid lattice structure during compression deformation were systematically studied by finite element simulation.The results show that the compression curve of the lattice structure can be divided into three stages,i.e.elastic deformation stage,elastic-plastic deformation stage and structural layer-by-layer failure stage.With the increase of volume fraction,the total energy absorbed by SLM forming gradient sheet-type Gyroid lattice structure increases,and the compressive modulus and yield strength of Gyroid lattice structure also increase gradually.Under compressive load,the stresses of homogeneous and gradient sheet-type Gyroid lattice structures are mainly concentrated in the connection area between inclined surfaces.As the local volume fraction gradient of the gradient lattice structure decreases,the stress concentration becomes more serious.As the gradient range of the gradient lattice structure increases,the stress gradient interval formed by the gradient lattice structure increases.The compression fracture behaviors of homogeneous and gradient sheet-type Gyroid lattice structures both are brittle fracture.

关 键 词：NITI合金 Gyroid点阵结构 激光选区熔化 力学性能 有限元模拟 

分 类 号：TN249[电子电信—物理电子学] V261.8[航空宇航科学与技术—航空宇航制造工程]