stress-strain circle

Bridge, crane beam, sleeper, ocean structure, pressure institution and nuclear reactor safety shell are often endured stress from many circle times and biggish repetition loading, and fatigue collapse is very easy accrued because of long and repeating loading.

桥梁、吊车梁、轨枕、海洋结构、压力机构和核反应堆安全壳等经常承受循环次数较多而重复荷载较大的结构，在长期的反复荷载的作用下极容易发生疲劳破坏。

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In order to calculate the intensity of general-stress in tri-axis test in geotechnical investigation, the author uses cartesian geometry principle to derivate calculation functions of common tangent points coordinates of every circle by the common tangent line. Especially, the slope tangent line is calculated directly.

工程勘察三轴试验的总应力强度指标的计算，运用解析几何原理导出任意两个应力圆公切线切点坐标计算公式，尤其是直接计算切线斜率。

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After wheel re-pro filing, the wheel wear rate increases which will reduce the wheel turning period. The normal contact stress tends to be stable after wheel wear and is not obvious related to the wear volume around the nominal rolling circle.

车轮经过镟修后，磨耗速率会增加，镟修周期缩短，车轮经过磨耗后法向接触应力趋于稳定，车轮滚动圆磨耗量与法向接触应力无明显关系。

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The paper discussed the strength calculation of the growing circle bure of small scale vertical boiler, and put forward his opinion according its stress.

就小型立式锅炉长圆孔开孔强度计算进行了探讨，根据长圆孔的应力状态，提出了自己的看法。

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A week Jay Chou Analysis method of fastener hole hole circle stress in FEM

紧固件孔周应力的一种有限元分析方法

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