爆炸与冲击2024，Vol.44Issue(1)：106-114,9.DOI:10.11883/bzycj-2023-0128
恒定高应变率拉伸条件下泡沫金属力学性能
Mechanical property of metallic foams under dynamic tension with constant high strain rate
摘要
Abstract
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 means of both decreasing the height of specimen to 1.55 times of the cells'equivalent diameter and stretching the specimen in two opposite directions with the same velocity.The scheme was verified to be rational by these four main requirements:the stress uniformity and deformation uniformity of the specimen,the acceptable failure position of the specimen and good repeatability.Employing this scheme,a series of dynamic tensile simulations were carried out to investigate the effect of the strain rate on the dynamic tensile mechanical properties of metallic foams.Results show that the failure strain of metallic foams is almost independent of the strain rate in the range from 0.5 s-1 to 5 000 s-1,and the failure stress of metallic foams is slightly affected by strain rate in the range from 0.5 s-1 to 500 s-1,but increases linearly with the strain rate in the range from 500 s-1 to 5 000 s-1.关键词
恒定高应变率/动态拉伸/泡沫金属/破坏行为Key words
constant high strain rate/dynamic tension/metallic foam/failure behavior分类
数理科学引用本文复制引用
张晓阳,谭仕锋,刘泽宇,赵飘..恒定高应变率拉伸条件下泡沫金属力学性能[J].爆炸与冲击,2024,44(1):106-114,9.基金项目
国家自然科学基金项目(11902140) （11902140）
湖南省自然科学基金项目(2018JJ3425) （2018JJ3425）
