A Nonlinear Fatigue Damage Model Based on Equivalent Transformation of Stress

It is rather difficult for engineers to apply many of the fatigue damage models for requiring a knee point, material-dependent coefficient, or extensive testing, and some of them are only validated by a fatigue test of two-stage loading rather than higher-stage loading. In this paper, we propose a n...

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Bibliographic Details
Published in:Journal of engineering (Cairo, Egypt) Egypt), 2021-11, Vol.2021, p.1-8
Main Authors: Zhang, Lu, Jin, Jie, Zhou, Wei, Li, Wen-Liang, Qiao, Meng
Format: Article
Language:English
Subjects:
Block loading
Crack propagation
Cumulative damage
Damage assessment
Engineers
Equivalence
Fatigue failure
Fatigue life
Fatigue tests
Mathematical analysis
S N diagrams
Variable amplitude loading
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Summary:It is rather difficult for engineers to apply many of the fatigue damage models for requiring a knee point, material-dependent coefficient, or extensive testing, and some of them are only validated by a fatigue test of two-stage loading rather than higher-stage loading. In this paper, we propose a new model of fatigue cumulative damage in variable amplitude loading, which just requires the information of the S-N curve determined from the fatigue experiment. Specifically, the proposed model defines a stress equivalent transformation way to translate the damage of one stress to another stress through simple calculation. Experimental data of fatigue including two-, three-, and four-block loading verify the superiority of the proposed model by comparing it with the Miner model and Manson model. The results show that the proposed model can be generalized to any type of loading and presents a better prediction. Therefore, the advantage of the proposed model can be easily used by an engineer.
ISSN:2314-4904
2314-4912
2314-4912
DOI:10.1155/2021/5581307