A new compression-molding approach using unidirectionally arrayed chopped strands

In this study, we propose a new compression-molding approach using unidirectionally arrayed chopped strands (UACS). UACS is a sheet made by introducing slits into a conventional prepreg. We demonstrate that complexly shaped components, such as rib structures, can be fabricated by stacking UACS plies and curing them by hot pressing. Moreover, the layer structure is maintained after the processing, and there are few resin-rich regions in it. We also demonstrate the superior mechanical properties of UACS laminate by comparing them with those of sheet molding compound (SMC) and propose that the strength of UACS can easily be deduced by a simple model based on fracture mechanics. As a result, we can clarify the contribution of slits introduced into the UACS to the final failure.