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Proceedings Paper

Impact force identification in aerospace panels by an inverse ultrasonic guided wave problem
Author(s): Ivan Bartoli; Salvatore Salamone; Francesco Lanza di Scalea; Jennifer Rhymer; Hyonny Kim
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Paper Abstract

This paper deals with monitoring impacts on aluminum and composite aerospace panels. The specific problems addressed are (1) the identification of the impact forces (force magnitude time history) and (2) the discrimination of "damaging impacts" from "non-damaging impacts." Ultrasonic guided waves generated by the impacts are used as the sensing mechanism. Flexible Macro-Fiber Composite (MFC) patches are used as the ultrasonic receivers. The impact force identification method is based on an optimization routine which minimizes the difference between the experimental impact waves and the numerical impact waves calculated by a Semi-Analytical Finite Element (SAFE) forced analysis. The differentiation of "damaging impacts" vs. "non-damaging impacts" is based on a frequency analysis of the impact waves. These techniques are demonstrated through an extensive experimental testing program involving the following six specimens: an aluminum panel, a quasi-isotropic CFRP composite panel, a highly anisotropic CFRP composite panel, a stiffened aluminum panel, a stiffened quasi-isotropic CFRP composite panel, and a stiffened anisotropic CFRP composite panel. These panels were subjected to low-velocity hammer impacts and to high-velocity gas-gun impacts by ice projectiles at speeds up to 170 m/sec using UCSD's gas-gun test facility. In all of these experiments, the techniques summarized above gave excellent results for both impact force identification and impact force discrimination.

Paper Details

Date Published: 31 March 2011
PDF: 11 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79841F (31 March 2011);
Show Author Affiliations
Ivan Bartoli, Drexel Univ. (United States)
Salvatore Salamone, Univ. at Buffalo (United States)
Francesco Lanza di Scalea, Univ. of California, San Diego (United States)
Jennifer Rhymer, Univ. of California, San Diego (United States)
Hyonny Kim, Univ. of California, San Diego (United States)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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