Take pin threads of NC50 drill collar as an example, Finite Element Method is used to analyze the different stress-relief grooves of pin thread connection.
以NC50型钻铤公螺纹作为研究对象，用有限元方法对加工有不同应力减轻槽的钻铤公螺纹接头进行了分析计算。
The rear stress relief grooves are necessary for stability and are visible.
后方纾缓压力槽是必要的，为稳定和清晰可见。
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