A thermodynamically consistent elastoviscoplastic phase-field framework for structural damage in PTFE

Deformation in polymers is highly dependent on molecular structures and motion relaxation mechanisms, which are influenced by temperature mechanical load history. These features imply that some models can fit for specific classes of not others; moreover, these also include several non-linearities, turns out to be challenging computational simulation. This work develops simulates a thermal-structural phase-field model the polytetrafluorethylene (PTFE) polymer. The constitutive multimechanism used considers non-isothermal non-linear elastoviscoplastic model, able represent elastic interactions, viscoplastic flow from polymer segments. Material parameters complex rheological addressed, through genetic algorithm, adjust curves simulated stress-strain experiments available literature. Results curves, followed rupture, ranging -50° C 150° plotted comparison with experimental results, presenting reasonable fit.