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基于一种金属对金属密封套筒结构内侧翻转直角槽和薄壁圆弧内缘根部的裂纹缺陷,采用试验和模拟相结合的方式,分析裂纹产生的原因。以翻转直角槽过渡圆角和薄壁圆弧内缘根部过渡圆角的大小为设计变量,通过构建数学优化模型,得出最佳数值,并对优化结果进行验证。结果表明,翻转直角槽过渡圆角取1.5 mm、薄壁圆弧内缘根部过渡圆角取3.0 mm时,翻转直角槽的最大等效塑性应变为0.31142、薄壁圆弧内缘根部的最大等效塑性应变为0.105129、薄壁圆弧处接触应力最大值可以达到1401.61 MPa,坐封后金属密封件密封性能稳定良好,没有出现裂纹缺陷。
Based on the crack defects in the inner side of the metal-to-metal sleeve with inverted rectangular grooves and the root of the thin-walled circular arc, the causes of cracks were analyzed by means of a combination of experiments and simulations. Taking the size of the transition fillet of the right angle groove and the transition fillet of the inner edge of the thin-walled circular arc as the design variables, the optimal numerical value is obtained by constructing a mathematical optimization model and the optimization result is verified. The results show that the maximum equivalent plastic strain of right-angle groove is 0.31142, the maximum equivalent plastic strain of the root of thin-walled arc is 0.105129, the maximum contact stress at the thin-walled circular arc can reach 1401.61 MPa, the sealing performance of the metal seal after setting is stable and good, and no crack defect occurs.