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Numerical Simulation of Al-Si Alloy Fatigue Behavior under Thermo-Mechanical and Isothermal Loads

Ghodrati Ghalati, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44828 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farrahi, Gholamhossein; Asghari, Mohsen
  7. Abstract:
  8. The main purpose in this thesis is the finite element simulation of the stress-strain behavior in an aluminum-silicon-magnesium alloy, subjected to low cycle fatigue and thermo-mechanical fatigue loadings. This finite element modeling is performed in the ABAQUS software. Two time-dependent and time-independent models are used to simulate the behavior of the material. The time-independent model is the combined nonlinear isotropic/kinematic hardening model, which predicts the mean stress relaxation behavior, the cyclic softening or hardening and the translation of the yield surface, while it ignores the effect of the strain rate. Time-dependent models include Johnson-Cook and the two-layer viscoplasticity models, in which the strain rate effect is also considered. Constants of these models are obtained by using low cycle fatigue experiments at different temperatures. Then, they are used to predict the thermo-mechanical fatigue behavior. This prediction shows that results of time-dependent models have a better agreement with experimental data than time-independent models due to consider the strain rate effect. The objective of this research is the prediction of the thermo-mechanical fatigue behavior by using low cycle fatigue experiments, where the thermo-mechanical fatigue test is time consuming and has high costs in comparison to low cycle fatigue tests. Finally, these constants are used to simulate the thermo-mechanical fatigue behavior of the cylinder head in the ABAQUS software. Results can be used to estimate the lifetime of the cylinder head
  9. Keywords:
  10. Thermomechanical Fatigue ; Low Cycle Fatigue ; Finite Element Simulation ; Aluminum-Magnesium-Silicon Alloy ; ABAQUS Software

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