Analyse expérimentale et modélisation micromécanique du comportement du polycarbonate soumis aux chargements complexes

Abstract : The behaviour of amorphous polymers is of a great interest in the research world because their application fields are various.transparency and high stiffness are the major advantages which made polycarbonate (pc) one of the most machined technical polymers. Phenomenological laws don?t allow reproducing correctly the behaviour of this polymer. this study proposes to analyze the pc?s behaviour based on simple and complex uniaxial compressive tests, in quasi static conditions and at room temperature. Tests with different loading ? unloading ? maintaining at constant forces cycles are done with various levels and maintaining times. Another series of tests is dedicated to show the induced anisotropy of pcs. all these experiments are compared to the boyce, parks and argon?s model (1988) very represented in the literature in order to check its validity. some lacks of this approach are enlightened. finally, a new micromechanical model is proposed based on the polymer structure and on its evolution, and inspired from metal plasticity models. the concept of balls which include several molecular chains is introduced. the total strain is additionally decomposed of three parts: elasticity, anelasticity and plasticity. The hardening is naturally introduced thanks to the combination of ball concept and lin?s model (1957). A first validation of this model is proposed, giving encouraging results for further works
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Cynthia Dreistadt. Analyse expérimentale et modélisation micromécanique du comportement du polycarbonate soumis aux chargements complexes. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ049S⟩. ⟨tel-01752682⟩

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