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|Title: ||A multiscale multisurface constitutive model for the thermo-plastic behavior of polyethylene|
|Issue Date: ||2016|
|Abstract: ||We present a multiscale model bridging length and time scales from molecular to continuum levels with
the objective of predicting the yield behavior of amorphous glassy polyethylene (PE). Constitutive pa-
rameters are obtained from molecular dynamics (MD) simulations, decreasing the requirement for ad-
hoc experiments. Consequently, we achieve: (1) the identification of multisurface yield functions; (2)
the high strain rate involved in MD simulations is upscaled to continuum via quasi-static simulations.
Validation demonstrates that the entire multisurface yield functions can be scaled to quasi-static rates
where the yield stresses are possibly predicted by a proposed scaling law; (3) a hierarchical multiscale
model is constructed to predict temperature and strain rate dependent yield strength of the PE.|
|Appears in Collections:||FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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