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Precise determination of fatigue crack closure in Al alloys

Title
Precise determination of fatigue crack closure in Al alloys
Authors
Lee, CSPark, CGChang, YW
POSTECH Authors
Lee, CSPark, CG
Date Issued
Jan-1996
Publisher
ELSEVIER SCIENCE SA LAUSANNE
Abstract
The crack closure phenomenon is important when evaluating the effective driving force for crack growth. Hence, the precise measurement of the crack closure load is an essential prerequisite for the determination of the effective stress intensity factor range (Delta K-eff). In the present investigation, an acoustic emission (AE) technique was employed to measure crack closure during the fatigue cycling of Al alloys and the results are compared with those obtained by the crack opening displacement (GOD) method, the back face strain (BFS) gauge method and the surface strain (SS) gauge method. Results show that the intrinsic fatigue crack growth rates (da/dN vs. Delta K-eff) obtained by the AE technique gave the best fit for the high stress ratio (R = 0.8) test, which implies that the AE technique should be considered as a reliable crack closure measurement method.
Keywords
acoustic emission technique; aluminum alloys; crack closure load measurement; crack growth rates; TIP
URI
http://oasis.postech.ac.kr/handle/2014.oak/21446
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 216, no. 1-2, page. 131 - 138, 1996-01
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 LEE, CHONG SOO
Graduate Institute of Ferrous Technology
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