Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 97, Issue -, Pages 150-161Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.12.037
Keywords
Magnesium alloys; Multiaxial fatigue; Cyclic properties; Fatigue modelling; Strain energy density
Funding
- Natural Sciences and Engineering Research Council (NSERC) under Automotive Partnership of Canada (APC) program [APCPJ 459269-13]
- Government of Ontario through Ontario Trillium Scholarship (OTS) program
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Multiaxial fatigue characteristics of AM30 Mg alloy extrusion are studied through fully-reversed strain controlled cyclic experiments including pure torsional and combined axial-torsional at 0, 45 and 90 phase angle shifts. Under pure torsional cyclic loading, AM30 extrusion is realized to exhibit better fatigue properties than AZ31B and AZ61A extrusions, especially in low-cycle fatigue regime. Under proportional axial-torsional cyclic loading, twinning/de-twinning in axial mode results in asymmetric shear hysteresis loop. The effect of non-proportionality of biaxial loading on various aspects of material response is also examined and observed to be depending on the magnitude of axial strain amplitude. Finally, the life prediction capabilities of two critical plane models, i.e., modified Smith-Watson-Topper (SWT) and Fatemi-Socie (FS), as well as Jahed-Varvani (JV) energy-based approach are assessed, employing fatigue life data of AM30 extrusion. Correlation data between experimental and estimated lives are found to lie within narrow scatter band. (C) 2016 Elsevier Ltd. All rights reserved.
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