ANALYSIS ON THE COUPLED FIELD IN A COMPONENT WITH A THREE COORDINATE EMBEDDING CRACK AT THE MOMENT UNDER THE PULSE CURRENT SWITCHED ON

The numerical simulation method is proposed for analyzing the coupled field in a component with a three coordinate embedding crack at the moment when the current is switched on.The distribution of temperature field and equal stress fields are studied around the crack tips in component with ellipse crack when the pulse current is switch on.The main factor effecting to current parameters is analyzing by changing the dimension of calculation models.The numerical calculations show that the temperature of crack tip grows up instantly by Joule heat source processing because of the current flowing over.The temperature is different along the ellipse crack tips,the maximum temperature appears near the long axes.If the current density is enough,the crack tip along the ellipse crack will be melt and the small welded joints can be formed at a small sphere near the crack tips,which decreases the stress concentration and forms a compressive stress area.So,the formation of the main crack source will be prevented and the goal of crack arrest can be reached.The analysis process is composed of the thermal-electrical coupled and thermal-mechanical coupled.The temperature field and stress field analysis results of numerical simulation correspond to the fact.