Load Interaction Effects on FCG: Master Curve Approach

Document Number: 2007-01-3676

Date Published: August 2007

Author(s):
Daniel Kujawski - Western Michigan Univ.
Sudip Dinda - Western Michigan Univ.

Abstract:
The majority of fatigue crack growth (FCG) data associated with load interaction effects have been interpreted in terms of plasticity effects at the crack wake. This paper presents a new approach by which the FCG behavior for different R-ratios can be predicted using the master curve. In this approach, the stress intensity factor (SIF) range, ¿K, is normalized in terms of ¿K at R=0. The corresponding mean value of SIF, Km, is normalized by the SIF amplitude, Ka. A curve is plotted for this normalized SIF data, which collapses all the R-ratios into a master curve and therefore enables the prediction of other R-ratios. From the analyses of different materials taken from literature it is demonstrated that the master curve approach is very effective in predicting the R-ratio effects on fatigue crack growth behavior.

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Product Status: In Stock

See other papers presented at Asia Pacific Automotive Engineering Conference, August 2007, Hollywood, CA, USA, Session: Transportation Challenges in Emerging Markets: Safety (Part 2 of 2)

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