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Journal of Failure Analysis and Prevention

, Volume 12, Issue 5, pp 507–517 | Cite as

Scatter Analysis of Fatigue Life and Prediction of S–N Curve

  • Prakash Chandra Gope
Technical Article---Peer-Reviewed

Abstract

In this study, the effects of salt solution, the presence of notch on fatigue life scatter, and sample size selection for estimation of fatigue life under different probabilities and confidence levels have been investigated. Comparison has been made with smooth specimen tested in air medium. It is seen that notches have significantly higher effect than other factors (salt solutions, smooth geometry, etc.). The minimum number of specimens required for fatigue life estimation within tolerable error, R o, at different fatigue testing conditions has also been presented both for log normal and Weibull distribution models. It has been found that estimation of fatigue life using Weibull model needs higher sample size than log normal model. Beyond a certain sample size, fatigue life estimation is independent of sample size. The article also presents a method for minimum sample size selection procedure to estimate fatigue life or to draw S–N curve.

Keywords

Fatigue life scatter Environment Geometry Sample size Fatigue life estimation 

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Copyright information

© ASM International 2012

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentCollege of Technology, G.B. Pant University of Agriculture & TechnologyPantnagarIndia

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