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延性材料动态拉伸断裂早期连通过程的逾渗描述

DOI: 10.11858/gywlxb.2006.02.003, PP. 127-132

Keywords: 逾渗理论,应力松弛,损伤演化,拉伸断裂

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Abstract:

借鉴逾渗理论,提出了新的应力松弛函数,简称PR函数(Percolation-ReleaseFunction),用以描述断裂发生前由于微孔洞连通而引起的快速应力松弛过程,具有较为明确的物理意义。通过其与损伤度函数模型进行耦合,对无氧铜和45钢平板撞击层裂进行了数值模拟。结果表明:数值计算不仅有效地再现了界面的应力历史和自由面速度历史,而且再现了靶中的损伤分布;新的逾渗松弛函数具有较好的适用性。

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