摘要
通过选择恰当的模型和科学的空间离散化,对SHPB加载过程进行了2D数值模拟,数值重现了帽型试样高应变条件下的绝热剪切变形历程。基于应力塌陷绝热剪切形成判据分析了材料绝热剪切变形规律;利用模拟结果的应力-时间、应变-时间曲线进行了温度场的计算,确定了剪切带的类型,计算结果与实验结果吻合。
Appropriate model and space discretization were chosen to simulate the loading process of specimens conducted on the Split Hopkinson Pressure Bar(SHPB) in two-dimension,and the adiabatic shear deformation course of the hat-shaped specimen under high strain rate was obtained.Based on the criterion of the formation of adiabatic shear to Stress Collage,the rule of adiabatic shear deformation was analyzed,the simulated stress-time curves and strain-time curves were employed to calculate the temperature field,the type of the shear bands was determined,and the results of numerical simulation are consistent with the experimental results.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2007年第10期27-30,共4页
Journal of Materials Engineering
关键词
绝热剪切变形
SHPB
帽型试样
数值模拟
adiabatic shear deformation
SHPB
hat-shaped specimen
numerical simulation