而交变应力集中是疲劳破坏的一个关键因素。
The concentration of alternate stress is a key factor of fatigue destruction.
应力集中是构件及节点发生疲劳破坏的重要因素之一。
Stress concentration is one of the important factors that cause fatigue undermine of the component and joints.
应力集中是钻具疲劳破坏的一个关键因素，定量计算钻具在井下所承受的应力水平及其分布规律显得尤为重要。
The stress concentration is a key factor causing fatigue failures. It is very important to make a quantitative research on the stress level and distribution characteristics of BHA.
含高应力集中钢结构构件的厚度是影响其发生脆性破坏的一个重要因素，它的影响是和其应力集中区的复杂应力状态相联系的。
The thickness of steel elements with high stress concentration is a very important factor for brittle fracture. Its effects depend on the complex stress state for the stress concentration area.
结果椎弓根螺钉内固定折断原因为局部应力集中及异常活动，多为技术因素。
Results The causes of spinal internal fixation broken were stress concentration and abnormal movement of internal fixation, and was mainly relative to poor techniques.
结果椎弓根螺钉内固定折断原因为局部应力集中及异常活动，多为技术因素。
Results The causes of spinal internal fixation broken were stress concentration and abnormal movement of internal fixation, and was mainly relative to poor techniques.
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