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Materials 2017, 10(12), 1401; doi:10.3390/ma10121401

Walker Parameter for Mean Stress Correction in Fatigue Testing of Al-7%Si-Mg Alloy Castings

School of Engineering, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA
Current Address: Auburn University, Auburn, AL 36849, USA.
Author to whom correspondence should be addressed.
Received: 22 October 2017 / Revised: 1 December 2017 / Accepted: 5 December 2017 / Published: 8 December 2017
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In this study, performance of two existing Walker parameter estimation models has been investigated. Results show that those developed mainly for steel did not provide reasonable fits to experimental Walker parameters for fatigue data for Al-7%Si-Mg alloy castings in the literature. A strong relationship between the Walker parameter and the structural quality, quantified by the quality index, QT, was observed and an empirical equation to estimate the Walker parameter for these alloys was developed. These findings indicate that the Walker parameter is not an intrinsic material property and the structural quality of the specimens must be taken into account for mean stress correction in fatigue testing. View Full-Text
Keywords: mean stress effect; runout analysis; S–N curve; Basquin Law mean stress effect; runout analysis; S–N curve; Basquin Law

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Özdeş, H.; Tiryakioğlu, M. Walker Parameter for Mean Stress Correction in Fatigue Testing of Al-7%Si-Mg Alloy Castings. Materials 2017, 10, 1401.

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