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.
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.
从焊接部位局部应力集中的角度分析了不等厚板在不同焊接形式下的疲劳寿命。
The fatigue life of different welding shapes between plates of unequal thickness in pressure vessel was investigated from the point of local stress concentration at welding position.
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