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Stress–strain time-dependent behavior of A356.0 aluminum alloy subjected to cyclic thermal and mechanical loadings

Farrahi, G. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11043-014-9238-4
  3. Abstract:
  4. This article presents the cyclic behavior of the A356.0 aluminum alloy under low-cycle fatigue (or isothermal) and thermo-mechanical fatigue loadings. Since the thermo-mechanical fatigue (TMF) test is time consuming and has high costs in comparison to low-cycle fatigue (LCF) tests, the purpose of this research is to use LCF test results to predict the TMF behavior of the material. A time-independent model, considering the combined nonlinear isotropic/kinematic hardening law, was used to predict the TMF behavior of the material. Material constants of this model were calibrated based on room-temperature and high-temperature low-cycle fatigue tests. The nonlinear isotropic/kinematic hardening law could accurately estimate the stress–strain hysteresis loop for the LCF condition; however, for the out-of-phase TMF, the condition could not predict properly the stress value due to the strain rate effect. Therefore, a two-layer visco-plastic model and also the Johnson–Cook law were applied to improve the estimation of the stress–strain hysteresis loop. Related finite element results based on the two-layer visco-plastic model demonstrated a good agreement with experimental TMF data of the A356.0 alloy
  5. Keywords:
  6. Aluminum–silicon–magnesium alloy ; Finite element simulation ; Low-cycle fatigue ; Stress–strain time-dependent behavior ; Thermo-mechanical fatigue ; Alloys ; Aluminum ; Aluminum alloys ; Consumer behavior ; Fatigue of materials ; Fatigue testing ; Finite element method ; Forecasting ; Hardening ; Hysteresis ; Hysteresis loops ; Magnesium alloys ; Stresses ; Viscoplasticity ; High temperature low cycle fatigues ; Strain hysteresis loops ; Thermal and mechanical loadings ; Time dependent behavior ; Viscoplastic models ; Strain rate
  7. Source: Mechanics of Time-Dependent Materials ; Vol. 18, issue. 3 , 2014 , p. 475-491
  8. URL: http://link.springer.com/article/10.1007%2Fs11043-014-9238-4