金属材料动态力学参数试验获取方法

Experiment method of deriving the dynamic mechanical parameters of metal materials

获取合理的金属材料动态本构,需要试验提供准确的材料动态力学参数。目前大多数试验采用准静态材料试验机和霍普金森杆进行,导致中、低段应变率试验数据的缺失,为对数据进行补充,该文在上述两种试验装置基础上,采用Instron高速材料试验机,对Q345钢进行动态拉伸试验,得到覆盖较广应变率的试验数据,并对试验试件的设计和修正、试验数据的处理方法以及Q345钢动态本构模型的拟合方法开展研究,总结形成一套系统的金属材料动态力学参数的试验获取方法,为建立其他材料的动态本构模型提供依据。

To get reasonable dynamic constitutive model of metal material, accurate experimental data of dynamic properties is required. At present, most test adopting the quasi-static material testing machine and the Hopkinson bar, leading to a lack of low and medium strain rate test data. in order to supply the data, the high-speed Instron material testing machine is also adopted to test Q345 steel dynamic mechanical properties. Comprehensive experimental data on strain rate were derived. The approach of designing and fixing test specimen, the analysis of experimental data and fitting process of dynamic constitutive model were studied. An experimental method to get dynamic parameters of metal materials were summarized, which can provide support to build dynamic constitutive model.