Journal
ENGINEERING FAILURE ANALYSIS
Volume 138, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2022.106342
Keywords
U75VG rail steel; Visco-plastic model; Strain-rate dependence; Cyclic deformation
Funding
- National Key Research and Development Program of China [2021YFB3703601]
- National Natural Science Foundation of China [12072295, 12192214, U21A20167, 11872321]
- Applied Basic Research Project of Sichuan Province [2021YJ0050]
- Fundamental Research Funds for the Central Universities [2682021ZTPY098]
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Experimental results showed that U75VG rail steel exhibits rate-dependent tension, cyclic softening feature, and ratcheting behavior at various loading rates. A new cyclic visco-plastic constitutive model was proposed based on the rate-dependent experimental results, which can reasonably simulate cyclic deformation behaviors under different loading rates.
The uniaxial tension, strain-controlled and stress-controlled cyclic deformation experiments of U75VG rail steel at various loading rates were carried out. Experimental results show that the U75VG rail steel shows obvious rate-dependent tension, cyclic softening feature and ratcheting behavior. Moreover, based on the rate-dependent experimental results, a new cyclic visco-plastic constitutive model was established by introducing the rate-dependent isotopic resistance and ratcheting factor into isotropic and kinematic hardening rules, respectively. Compared with the classic cyclic visco-plastic model, the proposed model can reasonably simulate the tension, strain controlled and stress-controlled cyclic deformation behaviors at different loading rates. Finally, the prediction capacity of ratcheting behavior under a wide range of loading rates was demonstrated.
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