A new and direct approach toward modeling gradual strength degradation of metal beams under cyclic bending up to fatigue failure
Multidiscipline Modeling in Materials and Structures
ISSN: 1573-6105
Article publication date: 16 May 2022
Issue publication date: 16 June 2022
Abstract
Purpose
The purpose of this study is to show how gradual strength degradation of metal beams under cyclic bending up to fatigue failure is simulated based on a new elastoplasticity model free of any yield criterion.
Design/methodology/approach
A new approach is proposed toward accurately and explicitly prescribing evolution of non-uniform stress distribution on beam cross-section under cyclic bending and, as such, gradual degradation of the bending strength can be directly determined.
Findings
Explicit results for the bending response in a whole cyclic process up to fatigue failure are obtained and the fatigue characteristic curve is for the first time simulated directly between the curvature amplitude and the cycle number to failure.
Originality/value
First, explicit and accurate determination of the non-uniform stress distribution on beam cross-section is achieved with asymptotic softening effects. Second, degradation of the bending strength can be directly deduced cycle by cycle. Finally, the relationship between the bending moment and the curvature is calculated using new and efficient numerical algorithms, thus bypassing usual time-consuming calculations with finite element procedures. Numerical results are presented and in good agreement with experimental data.
Keywords
Acknowledgements
This study was carried out under the joint support of the fund from National Natural Science Foundation of China (No. 12172149, No. 12172151) and the fund from China Aerospace Science and Technology Corporation (No. JH.2020.0434) as well as the start-up fund from Jinan University (Guangzhou).
Citation
Xiao, H., Li, Z.-T., Zhan, L. and Wang, S.-Y. (2022), "A new and direct approach toward modeling gradual strength degradation of metal beams under cyclic bending up to fatigue failure", Multidiscipline Modeling in Materials and Structures, Vol. 18 No. 3, pp. 502-517. https://doi.org/10.1108/MMMS-03-2022-0042
Publisher
:Emerald Publishing Limited
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