一种脆性材料动态本构损伤参数的计算反求方法

提出一种利用平板撞击的瞬态速度剖面响应来反求陶瓷脆性材料的动态本构损伤参数的方法。通过数值模拟再现平板撞击试验中的正平面波在飞片、样品和窗口材料中的传播情况，分析了“样品/窗口”界面瞬态速度剖面响应与材料参数之间的映射关系，进而建立了用响应反求本构参数的反问题，且通过一些数值试验验证该反问题是适定的。基于平板撞击速度剖面响应反求的方法，为快速地获得高应变率下一些传统方法难以测定出的本构参数提供新途径。

AN INVERSE TECHNIQUE FOR IDENTIFICATION OF DYNAMIC CONSTITUTIVE DAMAGE PARAMETERS OF BRITTLE MATERIALS

The computational inverse technique is proposed for determination of dynamic constitutive model damage parameters of brittle ceramic using the ceramic/window interface velocity profile response under plate impact. The shock wave translating in fly-plate, sample and window is represented by simulation. The relationship of the interface velocity profile response and constitutive parameters is studied. Examples are presented to demonstrate this inverse technique for characterizing the material property from response is very robust. Using the GA and the interface velocity profile response inversely determines constitutive model parameters. This method obtains the need parameters under high strain rates rapidly, which determined difficultly and expensively by traditional method.