Continuous fatigue crack length estimation for aluminum 6061-T6 plates with a notch

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This paper proposes an estimation technique of fatigue crack length for an aluminum 6061-T6 plate structure with a notch using a stress-life (S-N) curve. First, an S-N curve is obtained from multiple specimen tests by applying constant-amplitude cyclic loading with different stress levels. Next, the parameters of the Paris' law are estimated from the S-N curve by solving an optimization problem. Then, based on the Paris' law, the current crack length is continuously estimated by counting the elapsed fatigue loading cycles. The novelty of this study lies on the followings: (1) estimation of fatigue crack length using only the S-N curve for online fatigue crack monitoring, (2) estimation and experimental validation of the Paris' law parameters estimated from the S-N curve, and (3) experimental validation of the crack length estimation technique for notched aluminum 6061-T6 plates with various thicknesses. (C) 2018 Elsevier Ltd. All rights reserved.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Issue Date
2019-04
Language
English
Article Type
Article
Citation

MECHANICAL SYSTEMS AND SIGNAL PROCESSING, v.120, pp.356 - 364

ISSN
0888-3270
DOI
10.1016/j.ymssp.2018.10.018
URI
http://hdl.handle.net/10203/250338
Appears in Collection
CE-Journal Papers(저널논문)
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