Loading...

Thermo-mechanical behaviours of light alloys in comparison to high temperature isothermal behaviours

Azadi, M ; Sharif University of Technology

764 Viewed
  1. Type of Document: Article
  2. DOI: 10.1179/0960340913Z.0000000002
  3. Abstract:
  4. In this article, out-of-phase thermo-mechanical fatigue (TMF) behaviours of light alloys were investigated in comparison to their high temperature low cycle fatigue (LCF) behaviours. For this objective, strain based fatigue tests were performed on the A356 aluminium alloy and on the AZ91 magnesium alloy. Besides, TMF tests were carried out, where both strain and temperature changed. The fatigue lifetime comparison demonstrated that the TMF lifetime was less than that one under LCF loadings at elevated temperatures for both light alloys. The reason was due to severe conditions in TMF tests in comparison to LCF tests. The temperature varied in TMF test but it was constant under LCF loadings. As the other reason, the tensile mean stress occurred under TMF loadings, in comparison to the compressive mean stress under LCF loadings. At high temperatures, the cyclic hardening behaviour occurred in the AZ91 alloy and the A356 alloy had the cyclic softening behaviour
  5. Keywords:
  6. Cyclic hardening/softening behaviour ; Cylinder head ; Lifetime comparison ; Light alloys ; Low cycle fatigue ; Thermo-mechanical fatigue
  7. Source: Materials at High Temperatures ; Vol. 31, issue. 1 , 2014 , pp. 12-17 ; ISSN: 09603409
  8. URL: http://www.maneyonline.com/doi/abs/10.1179/0960340913Z.0000000002