An accurate fatigue damage model for welded joints subjected to variable amplitude loading

1st Conference of Computational Methods in Offshore Technology

计算机科学

Aeran, A.^1 ; Siriwardane, S.C.^1 ; Mikkelsen, O.^1 ; Langen, I.^1

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Norway^1

关键词: Damage evolution curves;    Eurocodes;    Fatigue damage models;    Material parameter;    Miner's rule;    Practicing engineers;    Standard codes;    Variable amplitude loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/276/1/012038/pdf
DOI  :  10.1088/1757-899X/276/1/012038

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Researchers in the past have proposed several fatigue damage models to overcome the shortcomings of the commonly used Miner's rule. However, requirements of material parameters or S-N curve modifications restricts their practical applications. Also, application of most of these models under variable amplitude loading conditions have not been found. To overcome these restrictions, a new fatigue damage model is proposed in this paper. The proposed model can be applied by practicing engineers using only the S-N curve given in the standard codes of practice. The model is verified with experimentally derived damage evolution curves for C 45 and 16 Mn and gives better agreement compared to previous models. The model predicted fatigue lives are also in better correlation with experimental results compared to previous models as shown in earlier published work by the authors. The proposed model is applied to welded joints subjected to variable amplitude loadings in this paper. The model given around 8% shorter fatigue lives compared to Eurocode given Miner's rule. This shows the importance of applying accurate fatigue damage models for welded joints.