Meanwhile, the influences of pipeline internal pressure, wall thickness, crack arrest length and initial crack velocity on the crack driving force (crack propagation) are further studied.

进而分析了管道内压、壁厚、裂纹止裂长度和初始裂纹速度对裂纹驱动力(也即裂纹扩展)的影响。

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The fatigue properties were researched and found that the crack propagation velocity and the decline of rigidity were related to the maximum cycle stress.

通过对其疲劳性能的实验研究，发现裂纹扩展速率的大小及刚度的下降与加载的最大循环应力密切相关的规律。

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The increase in the crack velocity of all materials in water environment is observed, but the degree is more remarkable for glass ceramics and zirconia.

所研究的材料在水环境下的裂纹扩展速度均加快，但玻璃陶瓷和氧化锆陶瓷材料更为明显。

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