Open Access

ARTICLE

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. https://doi.org/10.3970/sdhm.2008.004.161

Abstract

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.

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