延性材料一维动态断裂研究

对LY12铝合金进行了一维层裂的研究,利用锰铜压阻传感器测得了层裂信号,通过定量金相观察得到了靶板中损伤度的分布.提出了一个延性材料动态断裂模型,模型中考虑了材料的硬化和应变率效应,同时也考虑了惯性效应.作为本模型的一个应用,对两个层裂实验进行了数值模拟,计算结果与实验吻合。

Study of One-Dimensional Dynamic Fracture in Ductile Materials

A dynamic failure model in ductile solids under the application of a mean tensile stress is developed. The proposed model considers void nucleation and growth as part of the failure process under dynamic loading conditions. In the evolution of porosity, work-hardening, rate-dependent contribution and inertial effects are taken into account. Meanwhile, a plate impact test is performed for simulating dynamic failure process. The failure model presented in the present paper is incorporated in a hydrodynamic computer code, to simulate the first few stress reverberations in the target as it spall and post impact porosity in the sample. Fair agreement between computed and experimental results is obtained.