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9A micromechanics based constitutive model is developed that focuses on the effect 10 of distributed crazing in the overall inelastic deformation behavior of rubber-toughened 11 ABS (acrylonitrile-butadiene-styrene) materials. While ABS is known to exhibit craz-12 ing and shear yielding as inelastic deformation mechanisms, the present work is meant 13 to complement earlier studies where solely shear yielding was considered. In order to 14 analyse the role of either mechanism separately, we here look at the other extreme and 15 assume that the formation and growth of multiple crazes in the glassy matrix between 16 dispersed rubber particles is the major source of overall inelastic strain. This notion is 17 cast into a homogenized material model that explicitly accounts for the specific (cohesive

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Numerical simulations of the formation and the characteristic shape of plastic zones at crack tips in rubber‐toughened polymers are performed in order to get a better understanding of the underlying micromechanisms. Complementing previous work, the present study focuses on the contribution of distributed crazing. A macroscopic constitutive model therefore has been developed that describes the overall effect of distributed crazing as an anisotropic flow process. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)