層間に柔軟インサートを挿入したCFRP積層材振動特性の実測とFEM数値解析

抄録

In this study, impulse-hammering vibration measurements of carbon fiber reinforced plastic (CFRP) composite laminates with or without flexible sheets (PIEZON-PP) inserted at central interlaminars were carried out and then finite element method (FEM) numerical analysis by using general purpose code, ANSYS, was applied to identify elastic properties of CFRP and flexible sheet (PIEZON). For the present material properties identification for CFRP layers and flexible sheets, the first order Newton’s method was used to seek optimum elastic properties which minimized errors between the impulse-hammering measurement results and the FEM numerical results in terms of natural frequencies of the five lowest bending modes of three different unidirectional carbon fiber orientations, that is, unidirectional (0°) CFRP, transverse (90°) CFRP and 25° CFRP with and without flexible sheet. Good elastic properties identifications could be conducted and these properties will be able to be used for any further optimization problems such as topology optimization for CFRP structures with flexible damping sheets.