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Sample Size Determination for Development of S-N Curve of A356.2-T6 Aluminum Alloy

P. Ramamurty Raju1, B. Satyanarayana2, K. Ramji3

1 Associate Professor, Mech. Dept., SRKR Engg. College, Bhimavaram, India
2 Vice Chancellor, Andhra University, Visakhapatnam, India
3 Professor, Mech. Engg., Andhra University, Visakhapatnam, India

Structural Durability & Health Monitoring 2008, 4(3), 161-172.


This paper presents the details of method of sample size determination to estimate the characteristic fatigue life of aluminum alloy. The characteristic fatigue life of Aluminum alloy A356.2-T6 has been estimated by assuming a two parameter Weibull distribution model. A stepwise procedure is outlined to determine the number of specimens required at a predetermined stress amplitude to estimate the fatigue life within an acceptable error at a given probability and confidence level. The percentage of error is calculated at various probabilities and confidence levels (C.L). The probabilities considered are 50%, 90% and 95% whereas C.Ls considered are 90%, 95% and 97.5%. Maximum percentage of errors has also been calculated for the above probabilities and C.Ls. Details of development of S-N curve for aluminum alloy A356.2-T6 have been explained. Weibull slope have been plotted to represent the variation in the sample data at a particular stress level. From this study, it is concluded that the estimated fatigue life is reliable and the sample size considered for fatigue life estimation is adequate.


Cite This Article

Raju, P. R., Satyanarayana, B., Ramji, K. (2008). Sample Size Determination for Development of S-N Curve of A356.2-T6 Aluminum Alloy. Structural Durability & Health Monitoring, 4(3), 161–172.

cc 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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