Unnotched izod impact of short glass fibre reinforced PA6

The impact fracture behavior of short glass fibre reinforced Nylon 6 (SGF-Nylon 6) was studied using an instrumented izod impact approach. The failure mechanism of SGF-Nylon 6 was investigated by analyzing force-time curves and fracture section morphology.The section of specimen is divided into tensile responding area, neutral layer and compressive responding area along the impact direction. In unnotched izod impact test of SGF-Nylon 6, because the plastic deformation of matrix is constrained significantly by fibres, the energy consumed by the debonding of interface and the pulling-out of fibre dominates the impact fracture energy. The distribution quantity of fibre in sample dominates the izod unnotched impact fracture energy of SGF-Nylon 6. The crack origin has a distance from the outer surface because of the stress relax in outer layer by plastic deformation. The plastic deformation in outer layer shows that the surface of some pulling-out glass fibres adhere to much matrix and the wall of left holes are rough in outer layer.