Abstract

A detailed evaluation has been made of the mechanical properties of FRP materials made of unidirectional glass fibres impregnated with either epoxy or polyester resins. Such materials are used to make composite insulators for high voltage transmission lines. Result of these measurements and a finite element computation method have been used to assess the :nechanical stress distribution in the FRP core of t"'o types of composite insulators. Complete composite insulators have been mechanically tested to failure under static tension loads, pulsed tension loads and a combination of tension and bending loads. The insulator cores failed at load levels which agree 10ell with measured mechanical properties of the FRP materials.

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