탄소섬유 강화 복합재료 제조시 Veil 사용에 따른 계면물성 변화 조사 = Investigation of Interfacial Property Changes According to the Use of Veils in Carbon Fiber Reinforced Composites Fabrication

다국어 초록 (Multilingual Abstract)

In the aerospace industry, Out-of-Autoclave (OoA) processes are increasingly adopted to enhance manufacturing efficiency for large-scale structures, with Automated Fiber Placement (AFP) and Automated Tape Laying (ATL) technologies serving as core methods for precise dry preform layup. However, the incorporation of the veil exerts complex effects on the final mechanical properties; while it offers the positive benefit of enhancing interlaminar toughness by suppressing crack propagation, it simultaneously acts as a physical barrier that impedes resin flow and hinders direct bonding between the carbon fibers and the resin. This study investigates the effects of Polyamide (PA) binder veil insertion on the Interlaminar Shear Strength (ILSS) and micro-interfacial characteristics of carbon fiber composites, focusing on variations in consolidation pressure and veil layers. The results showed that all veil-inserted specimens exhibited a significant decrease in ILSS compared to non-veil specimens, regardless of pressure conditions. This degradation occurs because the veil acts as a physical barrier hindering resin impregnation and increasing interlaminar thickness, thereby weakening interfacial bonding. By identifying the mechanisms of mechanical degradation caused by binder veils in AFP/ATL-based processes, this study emphasizes the need for optimized process designs that balance manufacturing efficiency and mechanical integrity.