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A new energy-based isothermal and thermo-mechanical fatigue lifetime prediction model for aluminium-silicon-magnesium alloy

Farrahi, G. H ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1111/ffe.12078
  3. Publisher: 2013
  4. Abstract:
  5. In this paper, a new fatigue lifetime prediction model is presented for the aluminium-silicon-magnesium alloy, A356.0. This model is based on the plastic strain energy density per cycle including two correction factors in order to consider the effect of the mean stress and the maximum temperature. The thermal term considers creep and oxidation damages in A356.0 alloy. To calibrate the model, isothermal fatigue and out-of-phase thermo-mechanical fatigue (TMF) tests were conducted on the A356.0 alloy. Results showed an improvement in predicting fatigue lifetimes by the present model in comparison with classical theories and also the plastic strain energy density (without any correction factors). Therefore, this model is applicable for TMF, low cycle fatigue (LCF) and both TMF/LCF lifetimes of the A356.0 alloy. Furthermore, this model can be easily used for the estimation of thermo-mechanical conditions in components such as cylinder heads
  6. Keywords:
  7. Aluminium-silicon-magnesium alloy ; Energy-based approach ; Lifetime prediction model ; Low cycle fatigue ; Thermo-mechanical fatigue ; Energy-based ; Isothermal fatigue ; Lifetime prediction models ; Low cycle fatigues ; Thermo mechanical fatigues (TMF) ; Alloys ; Isotherms ; Magnesium alloys ; Mathematical models ; Silicon ; Aluminum
  8. Source: Fatigue and Fracture of Engineering Materials and Structures ; Volume 36, Issue 12 , 2013 , Pages 1323-1335 ; 8756758X (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1111/ffe.12078/abstract;jsessionid=D5C3E3FA4D09BED8A8B62B5D9879A42C.f03t02