薄層化CFRP積層板の衝撃損傷挙動とCAI強度に及ぼすハイブリッド積層および金属箔挿入の影響

Abstract

In this study, impact and compressive after impact (CAI) tests using varying impact energies were conducted using ply-level hybrid laminates composed of thin and standard ply clusters. In addition, fiber metal laminates (FMLs), which consisted of thin-ply prepregs and stainless layers with a thickness of 0.04 mm, were made in order to suppress the fiber breakage that caused a decrease in CAI strength. Next, impact and CAI tests were conducted on FMLs in order to investigate the effect of the inserting location in the thickness direction and the number of metal layers in failure mode, as well as CAI strength. The results confirmed that CAI strength was improved by both ply-level hybridization and the insertion of metal layers. In ply-level hybrid laminates, the incidence of fiber breakage and delamination was reduced by changing the ratio of thin-ply prepregs and their through the thickness location. In addition, plastic deformation of metal layers in FMLs led to a larger dissipated energy; thus, the failure occurred in a limited location, such as fiber breakage at the non-impacted laminate face.