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TECHNICAL PAPERS

Determination of Minimum Number of Specimens in S-N Testing

[+] Author and Article Information
Prakash Chandra Gope

Mechanical Engineering Department, College of Technology, G.B. Pant University of Agriculture & Technology, Pantnagar-263145, Uttaranchal, Indiae-mail: pcgope@rediffmail.com

J. Eng. Mater. Technol 124(4), 421-427 (Sep 30, 2002) (7 pages) doi:10.1115/1.1417486 History: Received February 28, 2000; Online September 30, 2002
Copyright © 2002 by ASME
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References

Figures

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Effect of acceptable error on Kn at 95% probability, 90% confidence level and log normal distribution (s/x̄=6%)
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Effect of coefficient of variation (s/x̄) on Kn at 50% probability, 95% confidence level and Ro=3% for log normal distribution
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Effect of probability (p) and confidence level (c) on Kn (log normal distribution, Ro=3%,s/x̄=4%)
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Minimum value of Kn for log normal distribution
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Minimum value of Kn for Weibull distribution
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Minimum sample size and coefficient of variation at 50% probability for log normal distribution
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Procedure for S-N testing and minimum sample size selection
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S-N curve with minimum sample for 0.26 C steel
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Fitted relationship between fatigue life (N) and stress amplitude (S, MPa) with range of data
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Basic shapes of S-N curves, (a) Hyperbola-asymptotic to the fatigue limit. (b) Two straight lines segment. (c) Sigmoid-asymptotic to the fatigue limit. (d) Any nature of curve, Sm=maximum stress of interest, Sn=minimum stress of interest
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Variation of error with sample size at 90% probability, 95% confidence level for 260 MPa
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Variation of Kn at 50% probability, 90% confidence level Ro=3.5% for log normal and Weibull distribution
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Variation of error at 270 MPa, 5.5% KCl, 90% probability and confidence level (0.26 C steel)
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Variation of gradient of error at 270 MPa, 5.5% KCl, 90% probability and confidence level (0.26 C steel)

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