A method: multi-scale calculation life of welded beams with residual stress

Engineering Research Express Pub Date : 2024-07-12 DOI:10.1088/2631-8695/ad62b4

Shining LYu, A. Wang, Youshan Gao, Huijuan Wu, Ling Gao

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Abstract

To improve the accuracy of the probability of life value calculation while ensuring computational efficiency, a study was conducted on the finite element probability of life calculation method for beam-shell coupling. On the basis of the finite element heat and stress coupling model of Type I welded beam, a fatigue fracture model of residual stress and cyclic load coupling was established. The probability of life calculation of beam-shell elements was theoretically derived, and the expression of the probability of life model was unified. The probability of life of Type I welded beam was calculated, and it was compared with the model of beam assumption and the full life test result. The results show that the computational efficiency of the beam-shell coupling model is higher than that of the shell element model. In addition, the probability of life calculation result obtained by the beam-shell coupling model is highly consistent with the experimental result in statistical terms, and it has higher accuracy at low stress levels than the calculation result of the beam element, with the relative error between the median of the calculation result and the experimental result being less than 10%.

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一种方法：具有残余应力的焊接梁的多尺度寿命计算

为了在保证计算效率的同时提高寿命概率值计算的准确性，对梁壳耦合的有限元寿命概率计算方法进行了研究。在 I 型焊接梁有限元热应力耦合模型的基础上，建立了残余应力与循环载荷耦合的疲劳断裂模型。从理论上推导了梁壳单元的寿命概率计算方法，并统一了寿命概率模型的表达式。计算了 I 型焊接梁的寿命概率，并与梁假设模型和全寿命试验结果进行了比较。结果表明，梁壳耦合模型的计算效率高于壳元素模型。此外，梁-壳耦合模型得到的寿命概率计算结果与试验结果在统计学上高度一致，在低应力水平下的精度高于梁元素的计算结果，计算结果的中位数与试验结果的相对误差小于 10%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Engineering Research Express

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