Probability life calculation model of beam element application and study in welded structures reliability analysis

IF 1.9 4区工程技术 Q3 ENGINEERING, MECHANICAL Advances in Mechanical Engineering Pub Date : 2023-09-01 DOI:10.1177/16878132231199901

Shining LYu, Aihong Wang, Guanghui Zhang, Youshan Gao, Fenglin Yao

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Abstract

Statistical size and geometrical size are the main factors affecting the service life of mechanical structure calculation. To explore the reliability of the lifespan of beam structures, a probability lifespan numerical calculation method based on Vector Form Intrinsic Finite Element Method (VFIFEM) was proposed, and the method was verified through full lifespan experiments on I-beam welded structures. First, a fatigue fracture model that considers the coupling of residual stress (RS) and cyclic load variations was established. Based on this fatigue fracture model, a probability lifespan calculation model for beam elements was defined by proposing a cross-sectional shape correction coefficient and a position correction coefficient. The proposed probability lifespan model for beam elements was used to calculate the I-beam welded structure, and the calculated results were compared with the full lifespan experiment results, which were close in statistical results, with all experimental results falling within the [10%, 90%] interval except for one experiment. This method effectively couples the influence of statistical size and geometric size on probability lifespan, providing a new approach for the structure probability lifespan calculation in the future.

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梁单元概率寿命计算模型在焊接结构可靠性分析中的应用与研究

统计尺寸和几何尺寸是影响机械结构使用寿命计算的主要因素。为探讨梁结构寿命的可靠性，提出了一种基于向量形式内禀有限元法(VFIFEM)的概率寿命数值计算方法，并通过工字钢焊接结构全寿命试验对该方法进行了验证。首先，建立了考虑残余应力与循环载荷耦合的疲劳断裂模型;在此疲劳断裂模型的基础上，通过提出截面形状修正系数和位置修正系数，定义了梁单元的概率寿命计算模型。采用所提出的梁单元概率寿命模型对工字钢焊接结构进行了计算，并将计算结果与全寿命试验结果进行了比较，结果表明，计算结果与全寿命试验结果的统计结果接近，除1个试验结果外，其余试验结果均落在[10%，90%]区间内。该方法有效地耦合了统计尺寸和几何尺寸对概率寿命的影响，为今后结构概率寿命的计算提供了一种新的方法。

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来源期刊

Advances in Mechanical Engineering 工程技术-机械工程

CiteScore

3.60

自引率

4.80%

发文量

353

审稿时长

6-12 weeks

期刊介绍： Advances in Mechanical Engineering (AIME) is a JCR Ranked, peer-reviewed, open access journal which publishes a wide range of original research and review articles. The journal Editorial Board welcomes manuscripts in both fundamental and applied research areas, and encourages submissions which contribute novel and innovative insights to the field of mechanical engineering