Abstract
This chapter presents a newly developed constitutive theory for predicting the time- and temperature-dependent behavior of fluoropolymers, including polytetrafluoroethylene (PTFE), paraformaldehyde (PFA), and FER. The mathematical details of the theory and its connection with the underlying microstructure are presented in the chapter together with aspects of its numerical implementation into large-strain finite element simulations. It is shown that the constitutive model accurately captures the experimentally observed behavior of PTFE by comparison with experimental data in monotonic and cyclic uniaxial loading and small punch (disk bend) tests, at different strain rates and temperatures. The model is also capable of predicting the influence of hydrostatic stress on both the deviatoric and volumetric flow rates, enabling the accurate predictions of PTFE with small amounts of porosity.
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