利用帽型试样在Hopkinson压杆上测试锻造退火态钨合金的动态应力-应变关系,通过计算拟合钨合金材料Johnson-Cook本构关系中的5个待定参量,建立帽型试样的有限元模型.采用两种不同的网格划分,在剪切区域内采用细密的网格,并逐渐过渡到粗糙网格.利用有限元分析软件LS-DYNA模拟钨合金帽型试样在冲击载荷下绝热剪切带的形成过程,与试验观察结果一致,对于理论分析和试验具有一定的参考和指导作用.
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