含钨活性材料动态压缩力学性能

为了研究活性材料的动态压缩力学性能，利用分离式霍普金森压杆（SHPB）对材料进行单轴压缩加载，获得了材料在不同应变率下的应力-应变曲线。将应力时程曲线和高速摄影拍摄结果对比，得到材料的屈服应力和临界反应应力。基于修正后的Johnson-Cook本构模型拟合材料参数，代入有限元计算软件LS-DYNA,计算结果和实验结果吻合较好，表明获得的模型参数可以较好地反映该材料的力学性能。

Dynamic Compressive Mechanical Properties of Tungstenic Reactive Material

The dynamic compressive properties of reactive material at various strain rates are investigated using the split Hopkinson pressure bars(SHPB). The stress-strain curves at different strain rates are obtained under uniaxial stress loading. The stress histories are explained by the high-speed photographs to obtain the yield stress and critical reaction stress. The experimental results are fitted based on the Johnson-Cook constitutive model, and agree well with the calculated results. Numerical simulations on the dynamic compression properties are also performed using LS-DYNA with the Johnson-Cook model. The simulation results are also in good agreement with the experimental measurements, which show that the obtained model parameters can be used to describe the mechanical behavior of material well.