The relation of law of the fatigue crack extending and feature of macro-profile is discovered, which provides a new method for the life estimation of the brake disc.

发现裂纹剖面宏观形貌特征与制动盘疲劳裂纹扩展规律之间存在一定的关联，为制动盘寿命评估提供了新的思路。

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According to principle of damage mechanics, the evolutional law of damage in pearlite ductile cast iron has been studied under fatigue and tension loading.

利用损伤力学原理，研究了珠光体球墨铸铁在疲劳和拉伸载荷作用下的损伤演变规律。

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The law ofpermeability changes of different frequency range was studied during the wire rope fatigue test.

研究了钢丝绳弯曲疲劳历程中，磁导率在不同空间频率区间的变化规律。

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Engel's frustration is pretty indicative of broader voter fatigue when it comes to debate over the health care law and most things in Congress, said David Bositis, a senior research associate at the Joint Center for Political and Economic Studies, pointing to Congress' abysmal approval rating.

CNN: Voters sick of health care debate