디지털 이미지 상관법을 이용한 PPS/GF 복합재의 금형 온도 의존적 변형 및 충격특성 연구 = Study on Mold Temperature-Dependent Deformation and Impact Behavior of PPS/GF Composites using Digital Image Correlation

다국어 초록 (Multilingual Abstract)

In this study, the impact resistance properties and strain behavior under static compressive load according to the mold temperature (80, 100, 120, 140, and 160℃) of the PPS/GF 65 wt.% composites applied to the housing part of an electric vehicle film capacitor were quantitatively evaluated using 3D digital image correlation analysis (DIC). The Izod impact strength increased by approximately 30% at 160℃ compared to 80℃, and the drop-weight impact energy absorption improved by approximately 70% in the range of 80-160℃. The static compression test on each component was conducted by injection molding the component under mold temperature conditions of 120, 130, and 140℃. As a result, the 140℃ mold condition showed the highest stiffness, toughness, and energy resistance, with an average maximum load of 28.4 kN and a principal strain of 4.5%. The DIC strain field revealed that strain concentration occurred at the lower left corner of the part during the loading phase prior to fracture initiation. Lower mold temperatures resulted in increased strain deviation and crack propagation variability due to non-uniform heat transfer along the thickness gradient. Accordingly, 140°C was identified as the optimal processing condition for uniform glass fiber orientation, maximizing unit impact resistance and energy absorption.