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In this study, we examine the effect of process conditions on Young’s modulus and tensile strength of extruded short-fiber reinforced thermoplastics. The mechanical properties of the matrix are improved with increasing extrusion ratio and decreasing extrusion temperature. The fiber alignment increases with increasing extrusion ratio and decreasing extrusion temperature. The mean fiber length decreases with increasing extrusion ratio and decreasing extrusion temperature. The orientation parameter, mean fiber length, Young’s modulus and tensile strength of the matrix are described as a function of extrusion ratio and extrusion temperature. The models proposed by Fukuda and Kawata, and Fukuda and Chou are applied to predict Young’s modulus and tensile strength of the composites using orientation parameter. By comparing the predicted Young’s modulus and tensile strength with experimental results, the validity of the models is examined. The prediction of Young’s modulus agreed almost with the experimental results. The tensile strength of composite extruded below the melting point agreed almost with that of the matrix. There is no the strengthening effect of the fiber since the angle between fracture surface and fiber direction is very small.

Prediction of Young's Modulus and strength of Extrudate in Short-Fiber-Reinforced Polypropylene by fiber orientation parameter