Experimental Investigations on the Tensile Properties of Notched and Unnotched Carbon Woven-ply PPS Laminates at Different Temperatures

摘要

The effect of temperature on the mechanical behavior of woven carbon fabric/polyethylene sulfide (CF/PPS) was investigated in this paper. Tensile tests were both conducted on notched and unnotched specimens at different temperatures (ambient, 95oC and 125oC), their strength and moduli were obtained and compared. The damage patterns of notched specimens were examined with the aid of optics. The results revealed that the strength of the two type of specimens present decline trend as temperature increases, while the modulus slightly increased at 125oC due to the cold crystallization. Obvious fiber bundles rotation and delaminations were observed in the damage patterns of notched specimens at elevated temperatures, which suggested the plastic deformation of matrix was enhanced and fiber matrix interface bonding strength was weakened. In addition, the high retention rate of strength and stiffness at 200oC indicated CF/PPS composite can be used as primary aircraft structures at elevated temperatures.