Damage Detection in Laminated Composite Plates Based on Local Frequency Change Ratio Indicator

Abstract

This paper presents an application based on Local Frequency Change Ratio (LFCR) for damage assessment of three-layer (0o/90o/0o) laminated composite plates. The indicator is used to help locating single and multiple potential damaged elements. The obtained results indicate that even when increasing damaged elements, LFCR indicator can detect the damage accurately. For more accuracy to prove that the LFCR is much better to identify the damage location in laminated composite, we introduced white Gaussian noise with different levels. The obtained results indicate that even under measurement noise level 2%, the LFCR can identify the actual damage with high precision.