A two‐dimensional analysis of the influence of delamination on the wave propagation in a fiber metal laminate

Structural Health Monitoring (SHM) of composite materials using Guided Ultrasonic Wave (GUW) represent a central research topic with large range application fields. One major concern in this context is the detection hidden inter-laminar damage such as delaminations composites, these cannot be detected by visual inspection [1]. Fiber Metal Laminate (FML) consist different layers metal (e.g. steel) and Reinforced Polymer (FRP) stacked on top each other belong to new type material system that has been insufficiently explored GUW. Following objective GUW, two dimensional numerical simulations wave propagation FML composed made from steel Carbon (CFRP) are conducted. In order properly identify describe phenomena occurring when GUW encounter delamination three kind models were considered: undamaged plate, damaged plate symmetrically off-center placed delamination. As far modeling delaminations, present work restricted zero-thickness-delamination generated de-merging nodes at interface layers. Mode-selective excitation (fundamental symmetric anti-symmetric mode wave) was then applied B-scan representations in-plane out-of-plane displacement fields compared. Effects reflection, transmission conversion main observed analyzed. Thus, singular phenomenon trapped can clearly interpreted.