The work presented in this paper is part of a project that aims at simulating the operation of nuclear power plants valves in nominal conditions. The purpose of this work is to model the behavior of compressed expanded graphite (CEG) packings in service. To achieve this goal, a double approach coupling experimentation and simulation is followed. Compressions and discharges tests of CEG samples are first carried out on an hydraulic press, then simulated with a finite element model that investigates the use of the Cam Clay model. A more complete representation of a packing in service is then modeled to compute the friction forces between the packing and the stem of a valve during the opening and closing phases. The results of these simulations are compared to previous experimental observations.

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