期刊
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
卷 29, 期 9, 页码 1397-1415出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1056789520930408
关键词
U75V steel; constitutive model; ratchetting; damage evolution; fatigue life
资金
- Joint Fund for Basic Research of High-Speed Railways [U1734207]
- National Key Research and Development Program [2017YFB0304500]
- Excellent Youth Found of Sichuan Province [2017JQ0019]
In the framework of continuum damage mechanics, a new damage-coupled cyclic plastic model is proposed to describe the nonlinear evolution of whole-life ratchetting and its dependence on the stress level. The characteristic that the damage evolution rate of U75V heat-treated steel decays in the initial load cycles is considered by introducing a modified term into classic damage evolution equation. A hybrid fatigue failure criterion considering both the fatigue and ratchetting strain-induced failures is established based on the fatigue failure rule concluded from experiments. Comparisons between simulated and experimental stress-strain hysteresis loops, ratchetting strains, damage evolutions, and fatigue lives are performed to validate the proposed model.
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