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Crystal plasticity-based impact dynamic constitutive model of magnesium alloy

机译:基于晶体塑性的镁合金冲击动力学本构模型

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摘要

The impact dynamic mechanical behavior of a magnesium alloy (extruded AZ31B) is first investigated by using the split-Hopkinson pressure bar (SHPB) apparatus. The dynamic tensile and compressive tests are performed at various strain rates ranging from 1250-2150 s(-1) and from 1600-3500 s(-1), respectively. The loading direction is set perpendicular to the extrusion direction of the AZ31B alloy. Experimental observation shows that the strain-rate sensitivity of the AZ31B alloy present under dynamic tension is higher than that under compression. Based on crystal plasticity and the approach of strain-rate sensitivity control used in the Preston-Tonks-Wallace model, a new impact dynamic constitutive model is established to describe the dynamic stress strain responses of the AZ31B alloy. Finally, comparing simulations with corresponding experiments, the simulations are found to agree well with the experiments, thus verifying the developed model.
机译:首先使用分体式霍普金森压力杆(SHPB)装置研究了镁合金(挤压的AZ31B)的冲击动力学力学性能。动态拉伸和压缩测试分别在1250-2150 s(-1)和1600-3500 s(-1)的各种应变速率下进行。加载方向设置为垂直于AZ31B合金的挤压方向。实验观察表明,在动态张力下存在的AZ31B合金的应变率敏感性高于在压缩状态下的应变率敏感性。基于Preston-Tonks-Wallace模型中的晶体可塑性和应变率敏感度控制方法,建立了一个新的冲击动态本构模型来描述AZ31B合金的动态应力应变响应。最后,将仿真与相应的实验进行比较,发现仿真与实验吻合得很好,从而验证了开发的模型。

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