A multiscale multisurface constitutive model for the thermo-plastic behavior of polyethylene. (22nd November 2016)

• Record Type: Journal Article
• Authors: Vu-Bac, N.; Areias, P.M.A.; Rabczuk, T.
• Is Part Of: Polymer. Volume 105(2016)
• Page Start: 327
• Page End: 338
• Publication Date: 2016-11-22
• Subjects: Multiscale modeling -- Multisurface yield functions -- Viscoplastic -- Polyethylene (PE); Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2016.10.039
• Languages: English
• ISSNs: 0032-3861

Abstract

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 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. Graphical abstract: Highlights: Identification of multisurface yield functions. Upscale strain rate from MD simulations to continuum. Multiscale model for predicting temperature and strain rate dependent yield strength.