Mechanical properties of aligned long glass fiber reinforced polypropylene. II: Tensile creep behavior

The creep behavior of long glass fiber reinforced thermoplastic composite w as investigated under different constant tensile stress and temperature. Fr om the time-dependent strain curve, the critical creeping time was defined as the transition point from steady to unsteady deformation and measured co rrespondingly. A statistical Weibull distribution function was adopted to d escribe the critical creeping time distribution at each stress level. A pow er law was employed to analyze the behavior of steady deformation stage of strain during loading. The relation between the critical creeping time and the parameter (m) of the power law is analyzed and discussed.