Influence of transverse load on the high cycle fatigue behaviour of low pressure cast AZ91 magnesium alloy |
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| Authors: | G Murugan K Raghukandan UTS Pillai BC Pai |
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| Affiliation: | aDepartment of Mechanical Engineering, Faculty of Engineering and Technology, Annamalai University, Annamalai Nagar, Tamil Nadu 608 002, India;bDepartment of Manufacturing Engineering, Faculty of Engineering and Technology, Annamalai University, Annamalai Nagar, Tamil Nadu 608 002, India;cNational Institute for Interdisciplinary Science and Technology-NIIST (formerly RRL), Papanamkode, Thiruvanadapuran, Industrial Estate, Kerala 605 914, India |
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| Abstract: | 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 (Kcr) 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. |
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| Keywords: | A Non-ferrous metals and alloys C Casting E Fatigue |
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