Finite element simulation of mechanical characterization of composite insulators

Finite Element Simulation and Mechanical Characterization of Composite Insulators Anurag Bansal Supervising Professor: Dr.M. Kumosa Composite Insulators are required to fulfill long-term structural roles in power transmission and substation applications. These insulators consist of a glass reinforced polymer (GRP) composite rod, with two metal end-fittings either mechanically crimped or adhesively bonded to the ends of the rod during assembly. In comparison with their porcelain counterparts, composite insulators offer significant advantages such as a high mechanical strength-to-weight ratio, improved damage tolerance, flexibility, and ease of installation. However, since they are a relatively new product, their design is still in an evolutionary stage, and their structural integrity and expected life to failure is a subject of great interest to both utilities and manufacturers. The objective of this study was to evaluate the short-term structural integrity of composite insulators subjected to externally applied multi-axial loads, in conjunction with the residual radial compression applied to the GRP rod during crimping. In order to achieve this goal, comprehensive axisymmetricand three-dimensional finite element models have been developed in this study. The models assumed either a perfectly bonded interface, or an imperfect interface between the GRP rod and metal end-fittings. The inter-

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