A novel index for vibration-based damage detection technique in laminated composite plates under forced vibrations: experimental study

Abstract

In this study, vibration modal analysis has been used to experimentally investigate the detection of fiber breakage (FB) and delamination in laminated composite plates. The modal analysis was performed on two arrangement styles of carbon fiber reinforced polymer (CFRP) laminated plates under forced vibrations. The main contribution in this study is that a new index named Improved Curvature Damage Factor (ICDF) was introduced to detect and localize damages in composite structures. It is a developed version of an earlier index based on the change in mode shape curvature (MSC) of dynamic response. To include the effect of more than one mode shape Cumulative Improved Damage Factor (CICDF) was proposed. The ICDF index was validated with a number of earlier studies that investigated the damage detection in different structures in order to approve the efficiency of this index. A scanning laser vibrometer was also used to experimentally examine the modal-based and forced responses for intact and damaged plates. Various experimental tests were used to verify the advantages of the proposed methodology and its use in structural health monitoring. In addition, the analysis of experimental results showed that the mutation caused by FB is almost double that of the value of delamination peaking.

A State-of-the-Art Review of Non-Destructive Testing Image Fusion and Critical Insights on the Inspection of Aerospace Composites towards Sustainable Maintenance Repair Operations

“…Here, measuring refers to correctly establishing the defect's location, size and significance. Structural health monitoring (SHM) methods have ensured useful strategies for inspecting aerospace composites in various recent studies [11][12][13][14].…”

Statistical Subspace-Based Damage Detection and Jerk Energy Acceleration for Robust Structural Health Monitoring

“…Thus, a basic and simple energy-based method that might be practical in terms of deployment on almost all kinds of structures is needed. Many existing algorithms [14][15][16] have the disadvantage of being susceptible to changes in the unidentified ambient vibration, which may result in false alarms. Moreover, the technique's viability under varying excitation [17][18][19] is also a challenging aspect of the SHM systems.…”