Edge Finishing Effects on the Impact Behavior of Chopped GFRP Composites

The low velocity and low energy impact response of two common sheet mold compound (SMC) material systems—SMC-R27, and SMC-R37—were investigated. In addition to characterizing the low velocity impact response and failure progression of the material systems, the edge effects of diamond saw cutting, waterjet cutting and abrasive waterjet cutting were investigated using optical microscopy and contact surface profilometry. Impact force–time and displacement–time responses were measured and used to characterize energy absorption capabilities and potential correlation to post processing operation and fiber volume fraction. Pre and post-impact edge surface micrographs were examined to relate the failure behavior on the machined surfaces. Experiments and measurements all show that the failure zone size and growth behavior are clearly dependent on the edge finishing process.