Abstract:
The injection-molded fiber reinforced thermoplastic composites are generally considered as isotropic material. However, the fibers manifest some degree orientation after injection molding, which makes the composite sample anisotropic. In order to reasonably predict the elastic modulus of such composites, the fiber length and orientation distribution in the injection-molded carbon fiber reinforced nylon 6 composites were tested and analyzed. The distribution of fiber orientation was obtained. Subsequently, combined with the mechanic model and stacking theory of unidirectional fiber reinforced composites, the theoretical model for predicting the elastic modulus of oriented fiber reinforced polymer composites was constructed. The theoretical results agree well with the tensile test ones, indicating that the accuracy of the prediction model is relatively high.
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