Delamination identification of CFRP laminated beams using the frequency response change

摘要

Recently CFRP laminated structures have been applied to many structures of vehicles. Interlaminar strength of laminated structures is relatively low, and delamination can be induced easily by an impact load or a cyclic load. Since delamination degrades stiffness of the structures, it is need to identify delamination nondestructively. Natural frequencies have been adopted to identify delamination of CFRP laminated beams. Identification of delamination location, however, is difficult, and another parameters that can identify delamination location are needed. In the present study, an identification method of delamination location for a CFRP laminated beam using the frequency response change is presented. The delamination location can be specified by the anti-resonance frequency change on the frequency response. Effectiveness of the present method is evaluated both in analysis and experiments.