Abstract：Theoretical analysis is made on the thermal stress field at the time of pulse current discharge in a metal structure with an elliptical embedding crack. In finding the thermal stress field, theories of heat conduction and unsteady thermal stress are used. It can be found from the formula for solving the thermal stress field that thermal stress field of the crack tip at time of pulse current discharge is formed, and thermal pressure field can effectively inhibit the crack propagation. And taking an example of Cr12MoV die steel with elliptical embedding crack, distribution of thermal stress field at time of pulse current discharge is calculated. The study provides a theoretic basis to the applications of stopping spatial crack with electromagnetic heating.
2013, Vol. 34 
