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Analytical Studies on S-N Curves for Some Steels

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Collection

2013 ASEE Annual Conference & Exposition

Location

Atlanta, Georgia

Publication Date

June 23, 2013

Start Date

June 23, 2013

End Date

June 26, 2013

ISSN

2153-5965

Conference Session

Materials Division Poster Session

Tagged Division

Materials

Page Count

7

Page Numbers

23.193.1 - 23.193.7

Permanent URL

https://peer.asee.org/19207

Download Count

75

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Paper Authors

author page

Somnath Chattopadhyay Georgia Southern University

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Abstract

Analytical Studies on S-N Curves for some Steels Somnath Chattopadhyay Georgia Southern University ABSTRACTExperimental data are often employed to obtain stress amplitude versus number of cycles tofailure characteristics of materials (S-N curve). This activity as a laboratory component of ajunior level materials science course explores the possible stages involved in a fatigue failureprocess. The students study the two important stages involved in fatigue failure: (a) the cracknucleation stage where a microstructurally small crack grows from a zero length to a tthresholdcrack size that depends on the applied stress level and the threshold fracture toughness (a conceptthat the students learn in the course); and (b) microstructurally long crack growth from thethreshold crack size to a characteristic size. This characteristic size is dependent on theendurance or the fatigue limit of the material as well as the threshold fracture toughness. .The students start with a given stress range and calculate the crack nucleation life (in cycles) andthe crack propagation life (in cycles) and combine them to find the number of cycles to failure.The input material properties needed for the exercise are the endurance limit and the thresholdfracture toughness.

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