Temperature Dependency of Tensile Behavior of CFRP Sheets

The purpose of this study is to find out the tensile behavior of Carbon Fiber Reinforced Polymer (CFRP) sheets at different temperatures. Ordinary epoxy resin to be softened and modified in a higher temperature than the glass transition temperature (Tg) which is investigated by DMA (Dynamic Mechanical Analyzer) tests. First, tensile behavior of non-impregnated carbon fiber sheets and epoxy resin is studied. Moreover the tensile behavior of CFRP sheets with both ordinarily used epoxy resin and newly developed epoxy resin that has higher heat-resistant behavior with higher than Tg is investigated experimentally. The specimens are stretched in lengths of 130 mm and 2, 000 mm to investigate the size dependency. Through the experimental investigations, the tensile strength, stiffness and ultimate strain under different temperature levels and size dependency are identified. It is considered that the temperature dependency of FRP tensile behavior is also a noticeable concern in FRP bonding techniques.