有限元分析表明，轴承内部存在三个应力集中区域。
Finite element analysis shows that there are three stress concentration areas inside the bearing.
设计了一组全息放大光路，提高了局部应力集中区域的测试精度。
A holographic partial magnifying optical arrangement was designed, and high accuracy in the measurement of the partial region of concentrated stress was obtained.
用金属磁记忆检测技术可有效判断套管的应力集中区域，为套管损坏进行早期诊断。
Metal magnetic memory testing technique can effectively distinguish stress concentration zone of casing, which can develop early diagnose for casing damage.
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