Analysis of the effect of temperature on the creep parameters of composite material

This study shows the effects of temperature on the creep parameters of a composite material made out of unsaturated polyester and reinforced with randomly oriented type C glass fibres with a surface mass of 450 g/m2. To better illustrate the complexity of the creep phenomenon and show its dependence on temperature, load, fibre concentration and crystallinity rate (a thermoplastic polymers), an experimental study was carried out to determine evolution of the law in function of the relevant parameters. The creep behaviour was then modeled using a phenomenological relationship, which is defined as ε = εo + Bσmtk, where ε, ε0, σ and t are, respectively, creep in traction after time t, the instantaneous strain, and the pressure applied on the tube over time t. Several samples were tested under varying temperatures and load charges. The experimental data were then used to determine the phenomenological relationship and its appointed coefficients ε, εo, σ.