Dislocation cell and sub grain formed in ferrite grain are found at the stage of fatigue crack propagation in the area of crack tip.
疲劳裂纹扩展阶段裂纹尖端附近为形成于铁素体晶粒内的位错胞及亚晶。
The stress at star tip of grain was maximal, which is liable to failure.
星尖处的应力最大，是发动机药柱容易失效的部位。
By way of the tip-point model of sudden change theory, the paper studies the physical process of single grain matter breaking.
本文利用突变理论的尖点模型研究了单颗粒物料破碎的物理过程。
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