Abstract
The structural health of composite structures is dependent on environmental conditions during their service life. Elevated temperatures can reduce the overall stiffness and strength of the composite, thereby increasing the likelihood of premature failure. The effect of elevated temperature on the elastic properties (longitudinal modulus, transverse modulus, shear modulus and Poisson’s ratio) of the out-of-autoclave carbon/epoxy prepreg (CYCOM 5320-1/T650) was investigated using a design of experiments approach. Tensile tests at four temperatures (24, 71, 118, and 166 °C) below the glass transition temperature (Tg) (177 °C) of the polymer matrix were performed according to a completely randomized design. Response surface models (RSMs) for predicting the elastic properties were developed using the analysis of variance procedure. The RSMs indicate that elevated temperatures have no significant effect on the longitudinal modulus and Poisson’s ratio of the material system. However, the degradation of the transverse and shear moduli due to increasing temperature is successfully represented by a linear and a cubic RSM, respectively.
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