On cooling and contraction, the small cracks further expand into hot tearing defect.
铸件冷却收缩时，小的裂纹源进一步扩展形成裂纹缺陷。
In contrast with the threshold of fatigue cracks, a series of regulation of expanding of fatigue small cracks has been deduced.
采用对比分析方法，从疲劳裂纹的门槛值角度出发，归纳总结了疲劳裂纹的扩展规律。
In the tests, competition of the MSD is observed, and group-occurring small cracks are also proved to be an important kind of failure mode.
在试验中观察到了MSD的竞争现象，证实了群发小裂纹也是MSD中一种重要的破坏形式。
In the tests, competition of the MSD is observed, and group-occurring small cracks are also proved to be an important kind of failure mode.
在试验中观察到了MSD的竞争现象，证实了群发小裂纹也是MSD中一种重要的破坏形式。
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