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Research Papers

Nondestructive Evaluation of Composite Material Damage Using Vibration Reciprocity Measurements

[+] Author and Article Information
Brandon R. Zwink1

Purdue Center for Systems Integrity, 1500 Kepner Road, Lafayette, IN 47905bzwink@purdue.edu

1

Corresponding author.

J. Vib. Acoust 134(4), 041013 (Jun 01, 2012) (8 pages) doi:10.1115/1.4006409 History: Received June 25, 2010; Revised February 18, 2012; Published June 01, 2012; Online June 01, 2012

Maintenance personnel in the U.S. military are interested in developing methods of damage detection for composite materials that are field expedient and less dependent on the operator’s experience than the current methods. A vibration-based method was developed for detecting damage in composite materials based on a measurement of the nonlinear forced response that damaged materials are assumed to exhibit. A damage feature was extracted for a structural component by quantifying the degree to which the reciprocity between two input-output structural paths fail due to the nonlinearities associated with damage. A dynamic nonlinear theoretical model was used to develop a better understanding of why reciprocity fails for networks of nonlinear components. Experimental results were obtained from carbon fiber composite specimens subjected to various levels of damage. It was determined that reciprocity measurements were capable of identifying damage due to impact energies of 10.8 N·m; however, the method was not capable of discerning damage that was not directly beneath the sensor locations. The levels of damage that could be consistently detected using the new methodology could be discovered through a close visual inspection. In comparison to currently employed methods of damage detection, the proposed methodology is less subjective but also less sensitive to damage. More development work will be required to propose this technology as a replacement for current methods such as ultrasound and tap testing.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) Linear dynamic model diagram (b) nonlinear dynamic model diagram

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Figure 2

FRFs for k1 nonlinearity near the first mode

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Figure 3

FRFs for c1 nonlinearity

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Figure 4

FRFs for c3 nonlinearity

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Figure 6

Foam boundary condition for CFC specimen

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Figure 8

Instron drop tester

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Figure 9

Load vs. deflection for specimen impacts

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Figure 10

Damage and sensor locations for CFC specimens

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Figure 11

FRF magnitude comparison for damaged and undamaged specimen C16

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Figure 12

Damage indices for damaged and undamaged CFC specimens C15 and C16

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Figure 13

FRF magnitude comparison for damaged and undamaged CFC specimen C13

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