Interlaminar Strength Improvement for CFRP Laminates by Zanchor Technology

摘要

Improvement in interlaminar strength for CFRP laminates was experimentally evaluated by using a new material technology called "Zanchor". The Zanchor technology is one of the interlaminar strength improvement methods by using through-the-thickness fibers[1]. Schematic view of the Zanchor process is shown in Fig.1. Some kind of special needle is stuck repeatedly into the non-crimp dry preform perpendicularly. Several inter-layers of non-crimp fabric (NCF) fibers are entangled by special needle. This process is entangled in-plane fibers to the other layers by the special needle. After the process, the dry preform is impregnated and cured by resin film infusion. These entangled fibers in the CFRP laminates may affect interlaminar strength improvement such as interlaminar fracture toughness, and peel strength. It is also expected that compression after impact (CAI) strength which governed by interlaminar strength properties of CFRP laminates is improved. In this report, mechanical properties of the Zanchor CFRP laminates were obtained, including tension, compression, open hole compression, impact delamination size and CAI strength for several densities of Zanchor. Moreover DCB test for CFRP laminates were also carried out for several densities of Zanchor. Mode I crack energy release rate (GIR) of Zanchor CFRP laminates were obtained by DCB test data.