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TECHNICAL PAPERS

A Frequency and Curvature Based Experimental Method for Locating Damage in Structures

[+] Author and Article Information
Colin P. Ratcliffe

Mechanical Engineering Department, United States Naval Academy, 590 Holloway Road, Annapolis, MD 21402

J. Vib. Acoust 122(3), 324-329 (Jan 01, 2000) (6 pages) doi:10.1115/1.1303121 History: Received August 01, 1999; Revised January 01, 2000
Copyright © 2000 by ASME
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References

Figures

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Curvature for the fundamental mode of a finite element free-free steel beam with 15 percent and 10 percent thickness reductions between grid points 7 and 8
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Damage index for the fundamental mode of a finite element free-free steel beam with 15 percent and 10 percent thickness reductions between grid points 7 and 8
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Schematic of the experimental configuration, showing the beam suspension, test grid, and location of the slot
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Measured percentage change in the natural frequencies of the first four bending modes vs. slot depth as a percentage of the beam thickness. Note that the curves for Modes 2 and 4 almost overlay.
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Broadband damage index for the 0.05 mm deep slot. The slot was at grid point 12.5, as marked.
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Broadband damage index for the 0.13 mm deep slot. The slot was at grid point 12.5, as marked.
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Modal Damage Index for the fundamental mode of the beam with the 0.36 mm deep slot at grid point 12.5, as marked
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Experimental modal curvature for the fundamental mode of the beam with the 2.29 mm deep slot at grid point 12.5, as marked
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Experimental modal curvature difference (Damaged-Undamaged) for the fundamental mode of the beam with the 2.79 mm deep slot at grid point 12.5, as marked

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