预加载螺栓连接的疲劳分析

IF 1.2 Q3 ENGINEERING, MECHANICAL
M. Welch
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引用次数: 0

摘要

本文提出了Wöhler图,或S-N曲线,用于分析预加载螺栓连接的螺栓疲劳。预压螺栓在循环荷载作用下具有较高的平均应力和较小的交变应力。这与螺纹根部的大应力集中相结合。疲劳分析方法采用S-N曲线,平均应力为零。螺栓所经历的高平均应力是用一个函数来计算损伤等效应力。对于化学成分包含在高强度螺栓材料规范中的材料,缺口灵敏度被认为可以修改S-N曲线。这产生了与螺栓螺纹相关的应力集中的S-N曲线。利用曲线拟合技术将这些曲线表示为等效应力和应力比的函数。对螺纹轧制螺栓的残余应力进行了估计。为疲劳寿命的计算提供了一种实用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fatigue analysis of preloaded bolted joints
This article presents Wöhler plots, or S-N curves, for use in the analysis of bolt fatigue of preloaded bolted joints. Preloaded bolts under cyclic loading have a high mean stress with a small alternating stress. This is combined with a large stress concentration at the thread root. The method of fatigue analysis presented uses S-N curves with a zero mean stress. The high mean stress experienced by the bolts is accounted for using a function to calculate a damage-equivalent stress. Notch sensitivity was considered to modify S-N curves for materials with chemical compositions encompassed within the material specifications for high strength bolts. This produced S-N curves for stress concentrations relevant to bolt threads. Curve fitting techniques were used to express these curves as a function of the equivalent stress and stress ratio. An estimate of residual stresses in bolts produced by thread rolling was made. The work provides a practical method of calculating fatigue life.
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来源期刊
FME Transactions
FME Transactions ENGINEERING, MECHANICAL-
CiteScore
3.60
自引率
31.20%
发文量
24
审稿时长
12 weeks
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