Open Access

ARTICLE

Statistical Analysis of Fatigue Life Data of A356.2-T6 Aluminum Alloy

Ramamurty Raju P.¹, Rajesh S.¹, Satyanarayana B.², Ramji K.³

1 Department of Mechanical Engineering, S.R.K.R.E.C, Bhimavaram-534204.
2 Andhra University, Visakhapatnam-530 003
3 Department of Mechanical Engineering, A.U.C.E (A), Visakhapatnam-530 003

Structural Durability & Health Monitoring 2011, 7(1&2), 139-152. https://doi.org/10.3970/sdhm.2011.007.139

Abstract

This paper presents the details of method of sample size determination to estimate the characteristic fatigue life of aluminum alloy, A356.2-T6. The characteristic fatigue life of the alloy has been estimated by assuming log normal distribution model. A step wise procedure is outlined to determine the number of specimens required at predetermined stress amplitude to estimate the fatigue life with an acceptable error at 50% probability and various confidence levels, 90%, 95% and 99%. Maximum percentage of errors has also been calculated for the above probability and confidence levels. Details of generation of S-N curve for aluminum alloy A356.2-T6 using regression analysis have been explained. From this study, the adequate sample size required for evaluating the average fatigue life of A356.2-T6 with an acceptable error at 50% probability and 90% confidence level using log normal distribution is established. In order to check the significance of regression equation, analysis of variance (ANOVA) is performed.

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Keywords

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