Damage Evaluation using Reflection Intensity from Damage in Metallic and Carbon Fibre Reinforced Polymer Laminated Structures

摘要

A powerful Mindlin pseudospectral plate element is employed for efficiently simulating the Lamb wave propagation in damaged metallic and CFRP laminated structures. Extensive explorations are performed to analyze the influence of various wave parameters on the reflection intensity from various damages, such as delamination in CFRP laminates, hole and crack in metallic plates. It is found that there are multiple optimal excitation frequencies to induce the strongest reflection intensity, which are close to the resonant natural frequencies of the local damaged region. Also, it is possible to evaluate the damage size by using a proposed relationship between the damage size and the reflection intensity in metallic structures.