The results turn out to be that the short cracks exhibit severe crack deflection and week crack closure effect.
试验和分析结果表明，短裂纹扩展的偏折强烈，裂纹闭合效应较小。
On the other hand, the stronger short crack effect is exhibited, which is attributed the dependent mentality of closure effect on crack wake.
同时，显露出强的短裂纹效应，系因裂纹闭合效应的尾迹依赖性。
The short cracks deflect more severe in coarse grain structure than in fine grain one, result in roughness induced crack closure effect, therefore exhibit slow crack growth rate.
粗晶组织比细晶组织的裂纹偏折更大，粗糙度诱发闭合效应更强，因而裂纹扩展较幔。
The short cracks deflect more severe in coarse grain structure than in fine grain one, result in roughness induced crack closure effect, therefore exhibit slow crack growth rate.
粗晶组织比细晶组织的裂纹偏折更大，粗糙度诱发闭合效应更强，因而裂纹扩展较幔。
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