Endochronic viscoplastic material models for filled PTFE

To describe the nonlinear material behaviour of polytetrafluoroethylene (PTFE), a viscoplastic material model of the overstress type is proposed based on experimental data. The approach starts with a rheological model without an elastic range, using a rate-independent elastoplastic model with an end...

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Bibliographic Details
Published in:Mechanics of materials 2002-12, Vol.34 (12), p.795-808
Main Authors: Kletschkowski, Thomas, Schomburg, Uwe, Bertram, Albrecht
Format: Article
Language:English
Subjects:
Applied sciences
Endochronic theory of plasticity
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Mechanical properties
Physical properties
Physics
Polymer industry, paints, wood
Properties and testing
PTFE compound
Solid mechanics
Structural and continuum mechanics
Technology of polymers
Viscoelasticity, plasticity, viscoplasticity
Viscoplasticity
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Summary:To describe the nonlinear material behaviour of polytetrafluoroethylene (PTFE), a viscoplastic material model of the overstress type is proposed based on experimental data. The approach starts with a rheological model without an elastic range, using a rate-independent elastoplastic model with an endochronic flow rule and a nonlinear elastic law in parallel connection with a nonlinear Maxwell model. The generalization to three dimensions is possible for both small and finite strains under the assumption that changes of the density are purely elastic. Numerical simulations show that the model can describe the short and long time material behavior of filled PTFE.
ISSN:0167-6636
1872-7743
DOI:10.1016/S0167-6636(02)00197-7