The initiation of small cracks more than 60% of them occurs on grain boundary.

微小裂纹的发生，60%以上发生于晶界。

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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。

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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。

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Small cracks have been discovered on the wings, and in 2010 a Rolls Royce engine on a Qantas flight exploded in mid-flight.

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Don't worry if the tops have a few small cracks.

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For an ad person who strives to challenge conventions and champions innovation, creativity becomes an exercise in finding small gaps and cracks that enable one to push the envelope.

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