Fast inverse identification of delamination of E-glass/epoxy laminated composite panels

Gun-Jin Yun; Shen Shang; Pizhong Qiao

doi:10.1117/12.821525

8 April 2009 Fast inverse identification of delamination of E-glass/epoxy laminated composite panels

Gun-Jin Yun, Shen Shang, Pizhong Qiao

Proceedings Volume 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009; 72940H (2009) https://doi.org/10.1117/12.821525
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

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.

Citation Download Citation

Gun-Jin Yun, Shen Shang, and Pizhong Qiao "Fast inverse identification of delamination of E-glass/epoxy laminated composite panels", Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 72940H (8 April 2009); https://doi.org/10.1117/12.821525

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