Abstract
In this paper, the purpose of this study is lifetime evaluation of seal performance of the O ring made in NBR (Nitrile- Butadiene Rubber) used for sealing up of the GIS (Gas Insulated Switchgear). We developed thermo -mechanical viscoelastic model using finite element analysis to predict aging of EP (Ethylene-Propylene)-rubber O-rings. To expand this life prediction method to NBR O-rings, material property of NBR was investigated experimentally. Stress relaxation tests and biaxial tension tests were performed to identify material property. As a result, experimental and calculated elastic potential showed good coincident and some values related temperature dependency indicate necessity of reexamination.
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