Impact force identification in aerospace panels by an inverse ultrasonic guided wave problem

Ivan Bartoli; Salvatore Salamone; Francesco Lanza di Scalea; Jennifer Rhymer; Hyonny Kim

doi:10.1117/12.880294

31 March 2011 Impact force identification in aerospace panels by an inverse ultrasonic guided wave problem

Ivan Bartoli, Salvatore Salamone, Francesco Lanza di Scalea, Jennifer Rhymer, Hyonny Kim

Proceedings Volume 7984, Health Monitoring of Structural and Biological Systems 2011; 79841F (2011) https://doi.org/10.1117/12.880294
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

Citation Download Citation

Ivan Bartoli, Salvatore Salamone, Francesco Lanza di Scalea, Jennifer Rhymer, and Hyonny Kim "Impact force identification in aerospace panels by an inverse ultrasonic guided wave problem", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79841F (31 March 2011); https://doi.org/10.1117/12.880294

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available