G0400505 Effect of Molding Conditions on Strength Properties of Short Carbon Fiber Reinforced PPS Plastic

Abstract

Effect of injection molding conditions on the tensile strength of short carbon fiber reinforced polyphnylene sulfide (PPS) plastic was investigated in order to apply the plastic to the structural members of automotive components. The length of the carbon fiber is 200μm. The volume fraction of the carbon fiber was 30%. Tensile test specimens were produced by injection molding with two different molding conditions. The tensile strength was changed depending on the molding conditions. Since the size and number of porosity are significantly different between two specimens, it was presumed that the salient factor determining tensile strength of the specimens was porosity. The point is that the results of the tensile test showed similar trend in terms of the effect of molding conditions to that obtained pressure test of the prototype components which were produced by different molding conditions. Although formation of porosity during injection molding is strongly influenced by the shape of the component, simple tensile specimen could be used to a certain extent to optimize molding conditions or understand strength properties of the real component.