By making use of thermo field dynamics (TFD), we construct the thermal superposition states in finite temperature.
作者利用热场动力学方法(TFD)，提出了具有有限温度的热叠加态。
2
By the principle of superposition fictitious stress on any individual crack surface in infinity can be resolved and also its value of stress intensity factor in infinity or finite body is obtained.
It is shown that this approach much more efficient than the conventional one, such as energy method, moment-area method, method of superposition and finite difference method.