机械载荷作用下的单边裂纹电热止裂效应分析

The Analysis of Crack Arresting Efficiency as a Result of Electrothermal Effects under the Mechanical Load

用一种新的方法求解出热源功率密度的表达式,定义出电热应力强度因子的概念。推导出电热应力强度因子的表达式,并与外加载荷产生的应力强度因子相叠加,得到了机械载荷和电流共同作用下的应力强度因子。进而得出应力强度因子与断裂准则的关系。通过算例分析证明,电热止裂可以提高金属材料的安全系数。

The expression of the heat source efficiency density can be provided through a new method. The concept of electrothermal stress intensity factors was definded and it's expression was deduced. Adding it to the stress intensity factor caused by the mechanical load, the stress intensity factors under the mechanical load and electric current common action were obtained. The relationship between the stress intensity factors and fracture judgment can be obtaided. As an example, it proves that the crack arresting as a result of electrothermal effects can improve the safty coefficient of the metal meterial.