トリプルスケール均質化法を用いた平織GFRP積層板のクリープ解析

抄録

In this study, creep analysis of plain-woven glass fiber-reinforced plastic (GFRP) laminates using a triple-scale homogenization method is conducted. In the triple-scale homogenization method, first, an analysis model is defined, in which a plain-woven laminate is regarded as a macro structure, plain fabrics and a matrix as a meso structure, fibers and a matrix in fiber bundles as a micro structure. Then, a nonlinear time-dependent homogenization theory is applied to the macro/meso and meso/micro problems, respectively. This method can directly take into account not only the creep properties of fiber bundles but also those of fibers and matrix materials in the fiber bundles. Using the present method, creep analysis of plain-woven GFRP (E-glass/epoxy) laminates subjected to on-axis (0°) and off-axis (15°, 30°, 45°) loading is performed at 25°C and 80°C, respectively. It is shown that the present method can take into account the effects of creep behavior of the epoxy in fiber bundles on the macroscopic creep properties of the plain-woven GFRP laminates. It is also shown that the temperature change greatly affects the creep behavior of the laminates.