零件的应力状况能够反映机械构件的工作状态，对它的有效检测和评估为提高产品的安全性、可靠性和稳定性提供了保障。
The working condition of mechanical components can be indicated by their stress states, whose measurement and evaluation can also improve the security, reliability and stability of the products.
此值被用来比较材料的强度，但是当设计计算时，要用一个安全系数，使工作应力低于比例限制。
This value is used to compare the strength of materials, but a safety factor is applied when making design calculations, to bring the working stress well below the limit of proportionality.
在数值模拟计算含缺陷球罐应力场的基础上，对含缺陷球罐在工作压力和超压两种工况下进行了断裂安全评定和强度校核。
Based the numerical simulation for sphere tank with defects, fracture safety assessment and stress strength verification are done under the cases of working pressure and over pressure.
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