Effect of fiber direction and temperature on mechanical properties of short fiber-reinforced PPS

Effects of fiber direction and temperature on mechanical properties of glass short fiber-reinforced poly phenylene sulfide have been investigated. Tensile properties degraded with increasing the angle between the tensile direction and the fiber direction; θ, except elastic modulus. Tensile strength and elastic modulus decreased and elongation increased with the increase of temperature. The tensile properties greatly varied at the temperature over Tg. The pull-out and peeling of fibers were observed in the case of θ = 0° and θ = 90°, respectively. The S-N diagram in the specimen with θ = 90° is approximated by two straight lines. At high stress amplitude, the fibers were peeled off with the breakdown of the matrix. At low stress amplitude, the fibers are peeled off due to interfacial fracture.