In the same time, a calculating formula of welding flat cover special for hydraulic test is deduced by setting certain safety coefficient of hydraulic test.
同时通过对试验压力取一定安全系数，推导出液压试验专用焊接平盖的计算公式。
According to the theory of classical mechanics, the problem of stress concentration of open cell of spherical cover end is always solved by approximate computing formula.
由经典力学理论，对于球形封头开孔应力集中问题，大都采用近似计算公式。
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