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Numerical simulations of cyclic behaviors in light alloys under isothermal and thermo-mechanical fatigue loadings

Farrahi, G. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2013.11.007
  3. Abstract:
  4. In this article, numerical simulations of cyclic behaviors in light alloys are conducted under isothermal and thermo-mechanical fatigue loadings. For this purpose, an aluminum alloy (A356) which is widely used in cylinder heads and a magnesium alloy (AZ91) which can be applicable in cylinder heads are considered to study their stress-strain hysteresis loops. Two plasticity approaches including the Chaboche's hardening model and the Nagode's spring-slider model are applied to simulate cyclic behaviors. To validate obtained results, strain-controlled fatigue tests are performed under low cycle and thermo-mechanical fatigue loadings. Numerical results demonstrate a good agreement with experimental data at the mid-life cycle of fatigue tests in light alloys. Calibrated material constants based on low cycle fatigue tests at various temperatures are applied to models to estimate the thermo-mechanical behavior of light alloys. The reason is to reduce costs and the testing time by performing isothermal fatigue experiments at higher strain rates
  5. Keywords:
  6. Cyclic behavior ; Isothermal fatigue ; Light alloys ; Numerical simulation ; Thermo-mechanical fatigue ; Computer simulation ; Cylinder heads ; Fatigue testing ; Isotherms ; Magnesium alloys ; Numerical models ; Low-cycle fatigue tests ; Numerical results ; Stress-strain hysteresis loops ; Thermo mechanical fatigues (TMF) ; Thermo-mechanical behaviors ; Aluminum alloys
  7. Source: Materials and Design ; Vol. 56 , April , 2014 , pp. 245-253 ; ISSN: 02641275
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306913010509