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Multiscale modeling of failure in thermoplastic PC/ABS blends

By Jonas Hund (Institute of Mechanics (IFM), Karlsruhe Institute of Technology (KIT))
Co-authors: Thomas Seelig (Institute of Mechanics (IFM), Karlsruhe Institute of Technology (KIT))

The macroscopic deformation and failure behavior of rubber-toughened thermoplastic PC/ABS blends is governed by various microscale damage mechanisms. Crazing and void growth from cavitated rubber particles prevail in the ABS phase while PC typically fails by ductile rupture at large strains [1]. Furthermore, the blend composition (PC/ABS ratio) as well as the rubber content of the ABS phase have an influence on the blend morphology as well as on the deformation and failure behavior [2]. In order to gain a better understanding of the micro-macro relationship in PC/ABS blends undergoing failure, a micromechanical RVE approach is pursued. Within this apporach the two constituents are represented as distinct phases in com- position dependent RVEs. To capture the deformation behavior of each phase different plasticity models are employed. Within the PC phase the standard glassy polymer model by Boyce and co-workers [3] is utilized. The inelastic deformation behavior of ABS is described by a novel model that accounts for the mechanism of distributed crazing in a homogenized sense [4]. Individual local failure criteria are employed in each phase. Nu- merical simulations analyzing the effect of the blend composition and morphology on the overall response are compared with experimental findings. References [1] Ishikawa, M., 1995. Stability of plastic deformation and toughness of polycarbonate blended with poly(acrylonitrile-butadiene-styrene) copolymer. Polymer 36, 2203-2210 [2] Tan, Z.Y., Xu, X.F., Sun, S.L., Zhou, C., Ao, Y.H., Zhang, H.X. and Han, Y., 2006. Influence of rubber content in ABS in wide range on the mechanical properties and morphology of PC/ABS blends with different composition. Polym Eng Sci 46, 1476-1484 [3] Boyce, M.C., Parks, D.M., Argon, A.S., 1988. Large inelastic deformation of glassy poly- mers. Mech Mater 7, 15-33 [4] Helbig, M., van der Giessen, E., Clausen, A.H., Seelig, Th., 2016. Continuum- micromechanical modeling of distributed crazing in rubber-toughened polymers. Eur J Mech A-Solid 57, 108-120

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