Abstract
The work deals with the use of GRP material in suspension electrical insulators. The mechanical
behavior of this material is modelized, and the model inserted in a finite element program in
order to estimate stress distributions in these composite insulators and describe their failure mode. The
material is assumed typically orthothropic with transverse isotropy. A three-dimensional failure criterion.
based on the fracture strength along the different axis of the material. is used to predict the location of
failure and the distribution of Slress components at the occurrence of this even!.
Some elastic properties and strength characteristics of GRP rod were obtained experimentally and
used as inputs in the FEM program. The FEM prediction concerning the location and orientation of
fracture compares well with the insulator destructive test results. It is found that the fracture propagates
in the direction of the equivalent stress gradient vector Vcr"'.
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