This paper is concerned with the time- and temperature dependences of the bending properties of the plain fabric glass cloth reinforced laminates (GRP) and the unsaturated polyester resins which are the matrices of the GRP.
The results obtained are summarized as follows:
(1) The creep compliances of the matrix and the GRP show the remarkable time- and temperature dependences; that is, they have so called viscoelastic behaviors.
(2) The master curves of the creep compliances for both the matrix and the GRP can be constructed, using their thermo-rheological simple properties. As for the time- and temperature shift factors, they are in good agreement quantitatively.
(3) It was found that the relation between the creep compliances of the matrix and the GRP is uniquely determined by the rule of mixture for viscoelastic materials, independent of the conditions of their circumstance such as time and temperature. This was also confirmed experimentally.