中文摘要：

对带有椭圆埋藏裂纹金属构件在脉冲放电瞬间的热应力场进行了理论分析．在热应力场的求解中，利用了热传导和非定常热应力理论，由求解的热应力场公式发现：在脉冲放电瞬间，电磁热在裂纹尖端形成热压应力场，热压力场可有效地抑制裂纹的扩展．以Crl2MoV模具钢中埋藏椭圆裂纹止裂为例，具体计算了脉冲放电瞬间的热应力场分布情况，为空间裂纹电磁热止裂技术的实际应用提供了理论基础．

英文摘要：

The thermal stress field is analyzed theoretically in a metal structure with an elliptical em- bedding crack at the time of pulse current discharge. When solving the thermal stress field, the theories of the heat conduction and the unsteady thermal stress are used. It can be found from the formula for solving the thermal stress field that thermal pressure field of the crack tip at time of pulse current discharge is formed by the electromagnetic thermal effect, and the thermal pressure field can effectively inhibit the crack propagation. And taking an example of Cr12MoV die steel with elliptical embedding crack,the distribution of the thermal stress field is calculated at time of pulse current discharge. A theoretic basis to the applica- tions of the electromagnetic thermal spatial crack arresting is provided by the study.