期刊论文

Mechanical property of metallic foams under dynamic tension with constant high strain rate

中文

爆炸与冲击

1001-1455

2024

44

1

106-114

10.11883/bzycj-2023-0128

11902140:国家自然科学基金 2018JJ3425:湖南省自然科学基金项目

本校为第一机构

为了探究泡沫金属恒定应变率动态拉伸力学行为,基于3D Voronoi模型,采用双向拉伸加载方式和1.55倍等效胞孔直径高度的试件,实现了 5000s-1恒定高应变率动态拉伸条件下泡沫金属力学性能测试数值模拟实验,模拟结果显示:动态拉伸过程满足应力均匀性和变形均匀性要求,且试件破坏位置合理;在恒定应变率(0.5～5000 s-1)动态拉伸时,泡沫金属的破坏应变基本不受应变率的影响;当应变率不超过500 s-1时,破坏应力受应变率影响很小,当应变率在500～5000 s-1时,破坏应力随着加载速率的增大而线性增大.

In order to explore the dynamic behavior of metallic foams under the stretch of constant high strian rate,a few numerical simulations were conducted to explore the effects of both the height of specimen and the tensile velocity on the stress uniformity and deformation uniformity as well as the failure position of the specimen under dynamic tensile loading.And then,a feasible numerical simulation scheme was proposed to obtain dynamic tensile properties of metallic foams under dynamic tension loading with constant strain rates.According to this scheme,the max strain rate reaches 5 000 s-1 by mea...