Journal
MATERIALS & DESIGN
Volume 30, Issue 10, Pages 4211-4217Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2009.04.042
Keywords
Non-ferrous metals and alloys; Casting; Fatigue
Categories
Funding
- DRDO [ERIP/ER/0303408/M/01 dated 16.02.2005]
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A new testing procedure, employing transverse load was adopted to investigate the high cycle fatigue behaviour of low pressure cast AZ91 magnesium alloy. The tests were conducted with an electro dynamic shaker system by employing specimens fabricated as per ASTM standard. S-N plot was generated from the test results and compared with that of gravity cast AZ91 alloy tested in identical ambience. The influence of transverse load on the fatigue behaviour of these alloys is discussed. As fatigue cracks were found to have initiated in pores in most of the tested samples, pores were assumed as initial cracks as per linear fracture mechanics and the critical stress intensity amplitude (K-cr) was estimated. Structure-fatigue property correlations are discussed using fractographs. Mean stress effect on the fatigue properties and effects of alloying constituents are also discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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