Estimation of mechanical properties of injection molded CF/LCP thin plates using fiber orientation distributions

摘要

Injection molded Liquid Crystalline Polymer (LCP) presents the unique multilayer structure. In this study, the fiber orientation and bending properties of carbon fiber reinforced LCP (CF/LCP) were investigated. The injection molded CF/LCP thin plates were manufactured with two kinds of gate shape; film and side gates. Two kinds of specimens consisted of five macro-layers; two skin-layers, two intermediate-layers and a core layer. Estimation of the bending modulus of the injection molded CF/LCP was investigated by the lamination theory and laminate beam theory in each layer. The modulus in each layer was calculated by using Cox formula and lamination theory based on the distribution of fiber orientation. The predicted bending modulus was in good agreement with the experimental data. Consequently, this method is valid for predicting the modulus of injection molded CF/LCP, which has the multilayer structure.