Based on the theory of surface diffusion, a finite element method was developed to simulate shape evolutions of two-dimensional microcracks with surface perturbation.
根据表面扩散控制下物质迁移规律，建立有限单元法，对裂面形貌扰动下二维微裂纹演变过程进行数值模拟。
The results indicate that the plasma sprayed wollastonite coating has a rough surface and lamellar structure including some pores and microcracks.
结果表明：等离子喷涂硅灰石涂层具有粗糙的表面和层状结构，涂层内部存在一些气孔和微裂纹。
When carburized under high carbon potential (1. 1% C), microcracks tend to appear on the martensitic matrix near the outer surface of the layer.
表面碳势为1.1%C的渗碳硬化层内，临近外表面部位的枣核马氏体中会出现显微裂纹。
It is showed that:(1)the major surface damage patterns due to grinding are microplastic deformation trace, fracture chipping pit, microcracks, and subsidence in the loosen region of material;
结果表明：磨削损伤的主要形式有显微塑性变形磨痕、断裂剥落坑、磨削微裂纹和材料疏松区的塌坑；
It is suggested that the broken crystal layer and microcracks in surface layer of the cold drawn rod is the source of the heat treatment induced cracks.
GH105合金冷拉棒表面存在的碎晶层和其内部的显微裂纹是热处理裂纹源。
It is suggested that the broken crystal layer and microcracks in surface layer of the cold drawn rod is the source of the heat treatment induced cracks.
GH105合金冷拉棒表面存在的碎晶层和其内部的显微裂纹是热处理裂纹源。
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