THERMOELASTIC BEHAVIOR OF PEEK THERMOPLASTIC COMPOSITE DURING COOLINGFROM FORMING TEMPERATURES

In the forming of advanced thermoplastic composite structures, the str esses generated during cooling have a profound effect on the distortio n and strength of the farmed parts, In this paper, the thermoelastic b ehavior of a PEEK matrix thermoplastic composite during cooling was in vestigated. A procedure for determining temperature-dependent thermal expansion coefficients using off-axis composite specimens was introduc ed, PI simple thermoelastic constitutive model was used to calculate t hermal stresses during cooling, Based on this model, an explanation of a strong scissoring effect on the thermal expansion behavior of symme tric [+/- 45](ns) laminates and a calculation of warping in a non-symm etric laminate were presented.