衝撃軸圧縮負荷を受ける織物CFRP円筒の実験結果との比較検討によるFEM解析の有用性

抄録

In recent years, automotive bodies are required to be lightweight because of the need to reduce travel resistance. Consequently, researchers are attempting to apply high-strength and lightweight FRP (fiber reinforced plastic) and FRTP (fiber reinforced thermoplastic) to automobile structures. Besides reducing the weight, the collision safety of automobiles, which is also a very important issue, should be ensured though investigation of the dynamic properties of FRP and FRTP. Both FRP and FRTP have been applied to automotive parts in small volumes so far, and dynamic fracture simulations of strain-rate-dependence cases are few compared to those for steel materials. In this study, the strain rate dependence results of tensile, compressive, and shear characteristic values of CFRP and CFRTP were experimentally obtained. Using these results and LS-DYNA, which is a general-purpose finite element solver, CFRP cylinders under axial impact compression were analyzed. These CFRP cylinders are assumed to be the member that absorbs impact energy in automotive structures. In addition, the FEM impact results were compared with the experimental results of the CFRP cylinders, and the validity of the FEM analysis was thus demonstrated.