疲劳裂痕成长；
The factors influencing the fatigue crack growth are of random nature.
影响疲劳裂纹成长的因素具有随机性质。
The reasons for vehicle frame fatigue crack appearing in early stage are found out.
找出了该车架裂纹过早出现的原因，并给出了对该种车架结构改造的方法。
This will lead to roll failure such as fire crack, surface crack, and fatigue failure.
这将会导致轧辊疲劳产生热裂、轧辊表面破裂或是疲劳层的产生。
Effect of different initial crack sizes on fatigue life was compared.
比较了不同初始裂纹尺寸对疲劳寿命的影响。
Moreover, the material initial crack can intensify fatigue when the structures under the wind load.
此外，材料的初始裂纹会加剧风荷载作用下结构的疲劳。
Based on these the fatigue life of the crack region were estimated.
编制载荷谱、估算裂纹处的疲劳寿命。
Based on these the fatigue life of the crack region were estimated.
编制载荷谱、估算裂纹处的疲劳寿命。
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