基于缺口应力法的疲劳曲线拟合方法研究

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Shengfu Xue, Zhengping He, Bingzhi Chen, Jianxin Xu
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引用次数: 0

摘要

设计/方法/途径基于对接接头和十字形接头的疲劳测试结果,本研究深入探讨了焊接接头缺口疲劳曲线拟合方法的选择。采用经验公式和有限元方法(FEM)评估了两种类型焊接接头趾部和根部的缺口应力集中系数。考虑到平均应力修正和焊接错位系数,采用直接和间接方法建立了缺口疲劳寿命曲线。尽管缺口应力法因其对部件疲劳寿命的准确预测而被广泛采用,但大多数学者都忽视了其曲线拟合方法的重要性。现有文献很少涉及这些曲线的建立。本文重点探讨了疲劳曲线拟合技术,为方法选择提供了宝贵的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on fatigue curve fitting methods based on the notch stress approach
PurposeThis study investigates the fitting techniques for notch fatigue curves, seeking a more reliable method to predict the lifespan of welded structures.Design/methodology/approachBuilding on the fatigue test results of butt and cruciform joints, this research delves into the selection of fitting methods for the notch fatigue curve of welded joints. Both empirical formula and finite element methods (FEMs) were employed to assess the notch stress concentration factor at the toe and root of the two types of welded joints. Considering the mean stress correction and weld misalignment coefficients, the notch fatigue life curves were established using both direct and indirect methods.FindingsAn engineering example was employed to discern the differences between the direct and indirect approaches. The findings highlight the enhanced reliability of the indirect method for fitting the fatigue life curve.Originality/valueWhile the notch stress approach is extensively adopted due to its accurate prediction of component fatigue life, most scholars have overlooked the importance of its curve fitting methods. Existing literature scantily addresses the establishment of these curves. This paper offers a focused examination of fatigue curve fitting techniques, delivering valuable perspectives on method selection.
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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