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Integrated Fatigue Life Assessment Method for Welded Structures

机译:焊接结构疲劳寿命综合评估方法

摘要

Due to the geometric discontinuities introduced by welding and joining processes, stresses or strains cannot be calculated stably using modern analysis and computer methods as a result of stress or strain specificity at joint locations, and severe mesh sensitivity. Results in The design and fatigue evaluation of these structures remains empirical. The present disclosure not only addresses mesh insensitivity of stress / strain calculations for welded structures through a cutting-face traction stress method through novel post-processing of conventional finite element calculation results, but also proportional or non-proportional multiaxial fatigue It provides an integrated fatigue evaluation procedure for fatigue design and structural life evaluation for both load-dependent low- and high-cycle fatigue regimes, and provides a simple and reliable method for handling spot welds.
机译:由于焊接和连接过程引入了几何上的不连续性,应力或应变由于连接位置处的应力或应变特异性以及严重的网格敏感性而无法使用现代分析和计算机方法稳定地计算出来。这些结构的设计和疲劳评估仍然是经验性的。本公开内容不仅通过常规有限元计算结果的新颖后处理,通过切削面牵引应力方法解决了焊接结构的应力/应变计算的网格不敏感性,而且还解决了比例或非比例多轴疲劳问题。疲劳设计和结构寿命评估的评估程序,适用于与载荷有关的低周疲劳和高周疲劳状况,并为处理点焊提供了一种简单而可靠的方法。

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