异质接头应力集中系数与坡口角度和材料差异度的关系方程
Stress concentration factor equation of heterogeneity joint based on slope angle and material difference
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摘要: 基于有限单元法针对异质对接接头设计,以提高接头疲劳承载能力以及更准确的预测异质接头疲劳失效位置为目标,考察了坡口角度和材料差异度对异质对接接头焊趾应力集中系数和焊根应力集中系数的影响,并给出了削平异质对接接头焊趾和焊根应力集中系数与坡口角度和材料差异度之间的关系方程.结果表明,随着坡口角度和材料差异度的增加,对接接头焊根应力集中系数增大,焊趾应力集中系数减小.应力集中系数关系方程与有限元结果吻合较好,相对误差在3%以内.Abstract: In order to improve the fatigue load carrying capacity and efficiently predict the fatigue failure position of heterogeneous joint, the influences of groove angle and difference between welded materials on joint stress concentration factor are studied based on finite element method. The weld root stress concentration factor and weld toe stress concentration factor relation equations of flat heterogeneous butt joint are also developed.The result shows that weld root stress concentration factor increases with the increase of groove angle and difference between welded materials, weld toe stress concentration factor decreases with the increase of groove angle and difference between welded materials. The results calculated by stress concentration factor relation equations are in good agreement with the finite element method results, and the relative error is less than 3%.
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