Abstract
The elastic constants (Young's modulus, shear modulus, and Poisson's ratio) of both uniaxial and balanced biaxial carbon fibre-reinforced plastic composites and the epoxy resin matrix within the temperature range −100° C to 170°C are presented. Comparison is made between the experimental values of the elastic constants and those predicted using micromechanic and macromechanic theories. The sensitivity of the elastic constants to temperature is closely related to the temperature dependent behaviour of the matrix. Below the transition region ( T ⩽ 120° C), the matrix is glassy and the elastic constants of the composite exhibit little change in value with change of temperature. In the transition region (120° C ⩽ T ⩽ 170° C), the matrix changes from a glassy to a rubbery state. The extent to which significant changes in the elastic constants of the composite occurs then depends upon whether the fibres or the matrix dominates its mechanical performance.
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