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Lee, Young-Joo
Structural Reliability and Disaster Risk Lab.
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Continuous fatigue crack length estimation for aluminum 6061-T6 plates with a notch

Author(s)
Lim, Hyung JinLee, Young-JooSohn, Hoon
Issued Date
2019-04
DOI
10.1016/j.ymssp.2018.10.018
URI
https://scholarworks.unist.ac.kr/handle/201301/25400
Fulltext
https://www.sciencedirect.com/science/article/pii/S0888327018306885?via%3Dihub
Citation
MECHANICAL SYSTEMS AND SIGNAL PROCESSING, v.120, pp.356 - 364
Abstract
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.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
ISSN
0888-3270
Keyword (Author)
Crack length estimationFatigue crackParis’ lawStress-life (S-N) method
Keyword
NONLINEAR ULTRASONIC MODULATIONFRACTURE-TOUGHNESSGROWTHLAW

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