Journal
POLYMER
Volume 105, Issue -, Pages 327-338Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.10.039
Keywords
Multiscale modeling; Multisurface yield functions; Viscoplastic; Polyethylene (PE)
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Funding
- ERC COMBAT project [615132]
- European Research Council (ERC) [615132] Funding Source: European Research Council (ERC)
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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 parameters 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. (C) 2016 Elsevier Ltd. All rights reserved.
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