A multiscale multisurface constitutive model for the thermo-plastic behavior of polyethylene

POLYMER

卷:105

Article

Vu-Bac, N.³  Areias, P. M. A.⁴  Rabczuk, T.^1,2,3 

[1] Ton Duc Thang Univ, Div Computat Mech, Ho Chi Minh City, Vietnam

[2] Ton Duc Thang Univ, Fac Civil Engn, Ho Chi Minh City, Vietnam

[3] Bauhaus Univ Weimar, Inst Struct Mech, Weimar, Germany

[4] Univ Evora, Colgio LuSAntnio Verney, Dept Phys, Evora, Portugal

关键词: Multiscale modeling;    Multisurface yield functions;    Viscoplastic;    Polyethylene (PE);   

DOI  :  10.1016/j.polymer.2016.10.039

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free