IMPLEMENTATION OF THE PUSH-OUT TEST FOR IMPROVING OF COMPOSITE INSULATOR END FITTING PERFORMANCE

Abstract

Destructive push-out test of composite rod joint was prepared in order to estimate ultimate load capacity of composite insulators end fitting joint. Plane strain and axisymmetric finite element models were developed. Imperfect interface with large allowed slipping and Coulomb friction was analysed. Experimental results were preliminary processed and ultimate load criteria chosen for appropriate manipulation and comparison. Results show that composite joints with contact pressures higher than the radial strength do not obey Coulomb friction law due to partial damage effect on the composite rod surface. However, for joints with limited contact pressure good agreement with classical friction model was obtained. Generalised relation between ultimate axial stress and contact pressure was also presented.