In this paper, a novel vibration-based methodology for fast inverse identification of delamination in E-glass/epoxy composite panels has been proposed with experimental demonstration using a scanning laser vibrometer (SLV). The methodology consists of 1) a parameter subset selection for delamination damage localization and 2) iterative inverse eigenvalue analysis for damage quantification. It can potentially lead to a functional formulation relating spatial and global damage indices such as curvature damage factor to local damage parameters. The functional relationship will be suitable to fast or real-time in-situ delamination damage identification. To accomplish the objectives, a shear-locking free higher-order finite element model has been combined with a micromechanics theory-based continuum damage model as an identification model for locating delamination. Applications of the proposed methodology to an Eglass/ epoxy panel [CSM/UM1208/3 layers of C1800]s = [CSM/0/(90/0)3]s with delamination have been demonstrated both numerically and experimentally using a piezoelectric actuator, a PVDF sensor and non-contact measuring SLV. Experimental modal analysis has been successfully conducted using the sample specimen to demonstrate the proposed methodology.

Date Published: 8 April 2009
PDF: 12 pages
Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 72940H (8 April 2009); doi: 10.1117/12.821525

Published in SPIE Proceedings Vol. 7294:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009
H. Felix Wu; Aaron A. Diaz; Peter J. Shull; Dietmar W. Vogel, Editor(s)