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基于单孔洞近似,对不同撞击速度下高纯铝的部分层裂实验进行了数值模拟研究,讨论了微孔洞长大对波传播的影响及其在自由面速度波剖面上的表现.通过分析微孔洞周围的应力场变化,认识到实测自由面速度波剖面出现“回跳”特征并不能说明材料发生完全层裂,其直接原因是样品内部微孔洞长大所引起的局部卸载效应.将计算得到的自由面速度波剖面和微孔洞相对体积与实验结果进行了对比分析,发现两者均符合很好,表明采用单孔洞增长来近似描述部分层裂样品中随机损伤发展及其对波传播的影响是可行的.
Based on the single-hole approximation, the numerical simulation of partial delamination of high-purity aluminum under different impact velocities was carried out. The influence of micropore growth on the wave propagation and its performance on the free-surface velocity wave profile were discussed. The change of stress field around the micropore and the fact that the “rebound” feature of the measured free-surface velocity wave profile does not explain the complete delamination of the material is the direct reason for the local unloading caused by the growth of the micropores in the sample The calculated free surface velocity wave cross section and the relative volume of micro-holes are compared with the experimental results and found that both are in good agreement, indicating that the use of single-hole growth to approximate the development of random damage in some stratified samples and Its impact on wave propagation is feasible.