層間を部分的に非接着にしたCFRP積層はりの減衰振動測定とFEM解析

概要

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In this study, three different types of delamination (partially-debonded regions in the adhesive layers) were artificially introduced into carbon fiber reinforced plastic (CFRP) laminated beams and then both of experiments and numerical analysis using finite element method (FEM) were applied to evaluate their vibration damping properties under cantilever-type fixtures. The experimental measurements showed that, when delaminations were introduced into the specimens, in general, the first bending mode frequencies decreased and the modal loss factors increased. For the purpose of explaining the experimental observations especially in terms of damping, distributions of transverse shear strain energy and contact pressure on the internal debonding surfaces were numerically examined by FEM analysis.