多晶体光滑表面疲劳微裂纹形核机理研究

On the Study of the Initiation of the Micro Crack on the Smooth Surface of Polycrystalline

建立晶体学模型来研究多晶体承受均匀外载时光滑表面疲劳微裂纹形核的机理· 由于晶粒取向的不相同,即使承受均匀外载,多晶体内将产生不均匀的应力,变形也不均匀· 在疲劳载荷的作用下,表面粗糙度随疲劳周次逐渐增加,变形逐渐集中到若干部位,即局部化。

Crystallographic plasticity was applied to study the initiation of micro cracks on the smooth surface of polycrystalline under uniform applied stress. Even under the uniform external stress, due to the different crystallographic orientations of the grains in the polycrystalline, there is un-uniform stress distribution and the deformation is also not uniform. Under the fatigue loading, the roughness increases with the number of fatigue, and deformation will localize in some places, where micro cracks form.