Development of a Two-Step Delamination Identification Method Using Resonant and Anti-Resonant Frequency Changes.

Abstract

Delamination identification is very important for structural health monitoring of composite laminated structures. In the present study, a two-step delamination identification method using resonant and anti-resonant frequency changes is proposed. The present method can identify the location of delamination and the size nondestructively. As a preparation for delamination identification of a CFRP laminated beam, the beam is divided into two domains. At the first step, the delaminated domain is identified using the anti-resonant frequency changes. At the second step, the delamination location and the size are identified in the delaminated domain using the resonant frequency changes. Delamination identifications of CFRP cantilever beams are conducted using both FEM analysis data and experimental data. As a result, effectiveness of the present method is shown.