Article,

The Mechanichal Performance of GRP used in electrical suspension insulators

, and .
(1985)

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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