Experimental observation and analysis of fatigue crack initiation near inclusion 夹杂物附近萌生疲劳裂纹过程的实验观测与分析
The generalized stress intensity factors near the inclusion corners are calculated by using body force method. The influence of the distance between the two square inclusions on the generalized stress intensity factors is also calculated. 应用体积力法计算了正方形夹杂角部的广义应力强度因子,并讨论了两个正方形夹杂之间距离对广义力强度因子的影响。
On the basis of the observation of microscopic experiment, the process, orientation and form of the fatigue crack initiation near the inclusion are studied and analyzed. 基于细观实验,对夹杂物附近疲劳裂纹萌生的形式、方向和过程等进行了分析.结果表明:夹杂物与基体弹塑性、热性上的差异导致不同萌生形式;
Stresses, straines, electric displacements and electric fields exhibit the inverse square root singularity near the inclusion tip. 应力场、应变场、电位移和电场在夹杂端点附近都呈现r-1/2奇异性。
Analytical expressions for stress intensity factors of the crack near the inclusion have been derived by using dislocation theoretical method. 本文采用位错连续分布方法,导出了位于片状夹杂端部的裂纹的应力强度因子的解析表达式。