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以高纯铝(99.999%)作为延性金属的模拟材料,在一级气体炮上开展了一维应变平面冲击波加载实验.通过对不完全层裂的回收样品进行细观微损伤统计分析,讨论了高纯铝动态破坏时发生的临界行为.文中定义拉伸应力和拉伸作用时间的乘积为拉伸(作用)冲量,统计发现:随着拉伸冲量的增加,样品中的损伤呈现明显的临界行为特征:当拉伸冲量较小时,损伤以线性方式缓慢增长,当拉伸冲量足够大,且超过一定的临界阈值以后,损伤以幂指数形式快速增长.初步实验结果表明,高纯铝的拉伸冲量临界阈值约为0.34GPa.μs,对应的损伤临界值约为0.12.
A one-dimensional strain plane shock wave loading experiment was carried out on a gas gun with high-purity aluminum (99.999%) as a simulation material for ductile metals. By analyzing the microscopic damage of incompletely recovered samples, It is found that the product of tensile stress and tensile time is the tensile (acting) impulse. The statistics show that with the increase of tensile impulse, the damage in the sample is obviously critical Behavior characteristics: When the impulse of impulse is small, the damage grows linearly slowly, and when the impulse of impulse is large enough and the critical threshold is exceeded, the damage grows rapidly with exponent of exponent.The preliminary experimental results show that the tensile of high-purity aluminum The critical value of the impulse is about 0.34GPa.μs, corresponding to a critical value of about 0.12.