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Proceedings Paper

Microcrack modeling and simulation for nonlinear wave modulation
Author(s): Sang Eon Lee; Suyeong Jin; Jung-Wuk Hong
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Paper Abstract

We present a technique for microcrack modeling in the finite element framework, and numerically investigate the occurrence of nonlinear wave modulation. Typically, fatigue cracks are initiated and developed when structures are exposed to repeated loading; the crack widths of the fatigue cracks are extremely small in the early development stage. As the fatigue cracks grow by combining and coalescing, the overall size increases. Enlarged cracks undermine the safety of the structure. Therefore, fatigue crack detection is very important to ensure the integrity of structures. Although the nonlinear ultrasonic wave modulation technique has been widely used due to its high detecting sensitivity, the basic principle is not fully understood. To reveal the mechanism of nonlinear wave modulation, the movements of the crack surfaces are calculated through numerical simulation. The shape of the crack surface can determine the intensity of the wave modulation. In this study, we investigate the variation of the crack widths due to fatigue failure using microscopic imaging of real fatigue cracks, and use these images to create realistic models of the fatigue cracks.

Paper Details

Date Published: 20 April 2016
PDF: 8 pages
Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98033J (20 April 2016); doi: 10.1117/12.2219471
Show Author Affiliations
Sang Eon Lee, KAIST (Korea, Republic of)
Suyeong Jin, KAIST (Korea, Republic of)
Jung-Wuk Hong, KAIST (Korea, Republic of)

Published in SPIE Proceedings Vol. 9803:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016
Jerome P. Lynch, Editor(s)

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