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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.


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.


Cite This Article

P., R. R., S., R., B., S., K., R. (2011). Statistical Analysis of Fatigue Life Data of A356.2-T6 Aluminum Alloy. Structural Durability & Health Monitoring, 7(1&2), 139–152.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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