平織GFRP積層板の弾-粘塑性挙動の温度依存性とマルチスケール解析

抄録

In this study, temperature dependence of elastic-viscoplastic behavior of plain-woven glass fiber-reinforced plastic (GFRP) laminates is experimentally observed, and the behavior is analyzed using a triple-scale homogenization analysis method. 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 bundle as a micro structure. Tensile tests of a plain-woven glass fiber/epoxy GFRP laminate are conducted under several temperature and strain rate conditions, showing its strong dependence on temperature. Based on the experimental results, temperature-dependent elastic-viscoplastic parameters of the epoxy are identified. Using the obtained parameters and the triple-scale homogenization method, elastic-viscoplastic behavior of the plain-woven GFRP laminate subjected to on-axis (0°, 90°) and off-axis(15°, 30°, 45°) loading is analyzed at several temperature conditions. It is found that the elastic-viscoplastic properties of the plain-woven GFRP laminate significantly depends on the temperature conditions and loading directions. It is also shown that the analysis results are in good agreement with the experimental data in various temperature conditions and loading directions.