Q345-TA2的动态流动应力特征和本构关系

Dynamic Flow Stress Characteristics and Constitutive Relation of Q345-TA2

钛钢复合板因其优异的高强度和耐腐蚀性能已越来越多的被应用于动态环境下。采用Gleeble-3500热模拟试验机和分离式霍普金森压杆(SHPB)装置,对Q345-TA2钛钢复合板进行准静态和高应变速率压缩试验。结果表明:Q345-TA2钛钢复合材料具有应变率增强效应、增塑效应、绝热温升软化作用,但在准静态和动态冲击各自分区范围内,对应变率变化不甚敏感。在考虑绝热温升的基础上,对J-C本构模型进行修正,得到了可用于对冲击载荷作用下进行结构分析的材料本构模型,结果较好。

Q345-TA2 titanium-steel clad plates have been more and more used in dynamic environment because of their high strength and excellent corrosion resistance. In this paper, quasi-static and high-strain-rate compression of Q345-TA2 titanium-steel clad plate was carried out by GLeeble-3500 thermal simulation testing machine and split hopkinson pressure bar（SHPB） device. The results show that the Q345-TA2 titanium-steel composite material has enhanced effect of strain rate, plasticizing effect and softening action of adiabatic temperature rise, but it is not very sensitive to strain rate change within the scope of each partition of quasi-static and dynamic. In consideration of the adiabatic temperature rise, the jaynes-cummings constitutive model is modified, and a material constitutive model is obtained which can analyze the structure under the impact load; the fitted results are in good agreement with the experiment.