섬유의 적층 각도에 따른 섬유 금속 적층판의 압입 손상 거동

Abstract

In this research, the effects of fiber stacking sequence on damage behaviors of FML(Fiber Metal Laminates) subject to indentation loading. SOP (Singly Oriented Ply) FML and angle ply FML were fabricated to study fiber orientation effects and angle ply effects. FML were fabricated by using 1050 aluminum laminate and carbon/epoxy prepreg. To increase adhesive bonding strength, AI laminate was etched using FPL methods. The static indentation test were conducted by using UTM under the 2side clamped conditions. During the tests, load and displacement curve and crack initiation and propagation behaviors were investigated. As fiber oricntation angle increases, thc crack initiation load of SOP FML increases because the stiffness induced by fiber orientation is increased. The penctration load of SOP FML is influenced by the deformation tendency and boundary conditions. However, the macro-crack of angle ply FML was initiated by fiber brcakage of lower ply because angle plies in Angle ply FML prevents the crack growth and consolidation. Thc Angle ply FML has a critical cross-anglc which prevent crack growth and consolidation. Damage behavior of Angle ply FML is changed around the critical cross-angle.