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An inelastic material model for filled polytetrafluorethylen
Authors:T Kletschkowski  U Schomburg  A Bertram
Institution:Technische Mechanik, Universit?t der Bundeswehr Hamburg, Holstenhofweg 85, D-22043 Hamburg, Germany e-mail: thomas.kletschkowski@unibw-hamburg.de, DE
Institut für Mechanik, Otto-von-Guericke-Universit?t Magdeburg, Universit?tsplatz 2, D-39106 Magdeburg, Germany, DE
Abstract:Summary  This paper presents a viscoplastic model for PTFE designed to simulate numerically PTFE shaft seals. A rate-independent elastoplastic model with an endochronic flow rule is coupled in series with a rate-dependent Kelvin model, which has a highly nonlinear damper. In contrast to previous models for PTFE, this unified approach is suitable for numerical simulation of the loading and the stress relaxation behaviour at ambient temperature. Received 30 October 2001; accepted for publication 21 January 2002
Keywords:  Viscoplasticity  Endochronic material behaviour  Rate-dependence  Relaxation
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