The method of crack - division is used to make radial cracks at the edge of cavity . a series of integral equations for determining the dsif at tips of anti - plane crack are set up in terms of the green ' s function 按“契合”的方式和采用裂纹切割技术构造出孔边径向界面裂纹对sh波散射的模型，利用green函数建立直接求解m型裂纹尖端动应力强度因子的定解积分方程组。
The results from the fes prove mat current density near the crack tip is 2 quantity - level greater than other positions of the cfrc sample , therefore , precipitations are firstly deposited near the crack tip and are also the most 由模拟的结果得出裂纹尖端附近的电流密度比cfrc试件其他地方的电流密度高出两个数量级，因此在裂纹尖端附近最先沉积沉积物并沉积的更多。
This paper , based on the finite element method ( fem ) and utilizing two different means , analyzes the stress and strain field distribution of central through crack tip on a finite flat plate , and calculates the stress intensity factor of the crack tip 摘要基于有限元分析方法，对有限大平板中存在的中心穿透裂纹，分别用不同的方法分析其裂纹尖端应力、应变场分布，计算出裂纹尖端的应力强度因子。
Positive electrode and negative electrode that execute spanning crack prevention are simulated as the source point and merged point , so the temperature field owing to the concentration of current around the crack tip is educed at the moment when the current is switch on 将实施跨越止裂时的正、负电极比拟为电流场中的源和汇，从而导出了在瞬间电流作用下，裂纹尖端附近区域因绕流而形成的温度场。
The thermal fatigue resistance of al2o3 - 20wt . % tic is the best , it is due to high kic and pore of the material . the pore decrease the stress extension of tip of cracks and delay themal shock fatigue cracks extension . 4 含20wt . tic的复合陶瓷具有高的k _ ( 1c )和较多的孔隙，这些空隙在热震疲劳时降低热震疲劳裂纹尖端的应力集中并阻碍裂纹扩展从而提高了材料的断裂抗力，故其具有最好的抗热疲劳性能。
The couple theory above - mentioned is applied at the crack tip of aluminum alloys , on ground of the theory , the experiment on the electrochemical action at the tip shows that the faster the strain rate is , the quicker the dissolution rate of the fresh surface of aluminum alloys is 将上述耦合理论应用于铝合金的裂纹尖端，并据此研究裂尖的电化学行为，发现铝合金新鲜表面的溶解速率随应变速率的增加而增大。
