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Open AccessArticle

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
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Author to whom correspondence should be addressed.
Current Address: Auburn University, Auburn, AL 36849, USA.
Materials 2017, 10(12), 1401; https://doi.org/10.3390/ma10121401
Received: 22 October 2017 / Revised: 1 December 2017 / Accepted: 5 December 2017 / Published: 8 December 2017
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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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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