Starting from the known mechanical properties of the components (glass reinforcement and resin) the stress-strain relations for an anisotropic viscoelastic material (glass-reinforced plastic) are determined. Using Volterra's principle  of replacing the elastic constants in the solution of the problem of the theory of elasticity  by integral operators, relations for the given material are obtained and found to be in fairly good agreement with the experimental data. In a separate study the high-temperature behavior of GRP is investigated by calculating the integral operators, which are functions of the viscous properties of the resin and the temperature.
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Van Fo Fy, G.A., Savin, G.N. Fundamentals of the theory of non-fabric glass-reinforced plastics. Polymer Mechanics 1, 106–110 (1965). https://doi.org/10.1007/BF00861906
- Experimental Data
- Mechanical Property
- Elastic Constant
- Integral Operator
- Separate Study