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A Corten-Dolan model considering material strength degradation

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Abstract –

Based on the Corten-Dolan model and the law of material residual strength degradation, a new nonlinear fatigue accumulation damage model is established. Combining the traditional material residual strength degradation model with the equivalent damage law, a material residual strength model suitable for variable amplitude loading is established. Subsequently, based on the above residual strength model, the material residual strength attenuation coefficient is constructed by using the ratio of material residual strength to initial strength, and it is introduced into the traditional Corten-Dolan model and its key parameter d to improve the model. The proposed model can not only consider the influence of residual strength on damage accumulation, but fully consider the influence of small load, stress state and damage degree as well. According to the test data of aluminum alloy 7070 - T7451, titanium alloy Ti-6Al-4V, ductile iron GS61, 45 steel, 16Mn steel, and aluminum alloy welded joints, it is verified that compared with the traditional Corten-Dolan model, the established model has higher accuracy in fatigue life prediction under two-level block loading or multi-level block loading. The proposed model can better calculate the fatigue life of metal materials under multi-level variable amplitude loading and the mathematical expression is relatively simple and has strong engineering practicability.

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Funding

This study was supported by the Natural Science Foundation of Liaoning Province (no. 2019KF0204); the State Key Laboratory of Structural Analysis for Industrial Equipment Open Funding, Dalian University of Technology (GZ19204); and Liaoning Province 2020 College Innovation Talents Support Plan.

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Authors and Affiliations

  1. School of Civil Engineering, Dalian Jiaotong University, 116028, Liaoning Dalian, China

    Xu Xu & Qiwen Xue

  2. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, 116024, Liaoning Dalian, China

    Xu Xu, Qiwen Xue & Yiqian He

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  1. Xu Xu
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Correspondence to Qiwen Xue.

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Xu, X., Xue, Q. & He, Y. A Corten-Dolan model considering material strength degradation. Mech. Solids 57, 149–162 (2022). https://doi.org/10.3103/S002565442201006X

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