Shear cutting behaviors in thermosetting and thermoplatic CFRP laminates

摘要

This paper presents shear cutting behaviors in thermosetting and thermoplastic CFRP laminates. Cross-ply laminates were fabricated from unidirectional thermosetting and thermoplastic CFRP prepregs for shear cutting tests. The tests were conducted by using three upper blades (Blades A, B and C) with different clearance and shearing angles at room and elevated temperatures up to around the glass transition temperature T_g. The cross-sections near the cutting surfaces were observed to quantitatively measure the length of burrs and removal part. In addition, double cantilever beam (DCB) tests were performed to measure mode I interlaminar fracture toughness of the thermosetting CFRP at various temperatures. It was found that the optimum cutting for the thermosetting CFRP is achieved by using Blade C at a temperature of 70°C, which is slightly lower than T_g. However, optimum cutting conditions are not proposed for the thermoplastic CFRP yet since the dominant parameters are not always identified under the conditions within the present study.