مقاله A physically-based constitutive model for anisotropic damage in rubber-toughened glassy polymers during finite deformation : تی پی بین

خلاصه مقاله

The present work focuses on the development of a physically-based model for large deformation stress–strain response and anisotropic damage in rubber-toughened glassy polymers. The main features leading to a microstructural evolution (regarding cavitation, void aspect ratio, matrix plastic anisotropy and rubbery phase deformation) in rubber-toughened glassy polymers are introduced in the proposed constitutive model. The constitutive response of the glassy polymer matrix is modelled using the hyperelastic–viscoplastic model of 12 and 14. The deformation mechanisms of the matrix material are accounted for by two resistances: an elastic–viscoplastic isotropic intermolecular resistance acting in parallel with a visco-hyperelastic anisotropic network resistance, each resistance being modified to account for damage effects by void growth with a variation of the void aspect ratio. The effective contribution of the hyperelastic particles to the overall composite behaviour is taken into account by treating the overall system in a composite scheme framework. The capabilities of the proposed constitutive model are checked by comparing experimental data with numerical simulations. The deformation behaviour of rubber-toughened poly(methyl methacrylate) was investigated experimentally in tension at a temperature of 80 °C and for different constant true strain rates monitored by a video-controlled technique. The reinforcing phase is of the soft core–hard shell type and its diameter is of the order of one hundred nanometers. The particle volume fraction was adjusted from 15% to 45% by increments of 5%. The stress–strain response and the inelastic volumetric strain are found to depend markedly on particle volume fraction. For a wide range of rubber volume fractions, the model simulations are in good agreement with the experimental results. Finally, a parametric analysis demonstrates the importance of accounting for void shape, matrix plastic anisotropy and rubber content.

نویسندگان

F. Zaïri [ Univ Lille Nord de France, F-59000 Lille, France ]

M. Naït-Abdelaziz [ Univ Lille Nord de France, F-59000 Lille, France ]

J.M. Gloaguen [ Univ Lille Nord de France, F-59000 Lille, France ]

J.M. Lefebvre [ Univ Lille Nord de France, F-59000 Lille, France ]

کلمات کلیدی

Constitutive modelling Hyperelasticity Viscoplasticity Cavitation Anisotropic void growth

آدرس این مقاله

آدرس مستقیم دسترسی به این مقاله

مشخصات کنفرانس

مشاهده مقالات

International Journal of Plasticity

The purpose of the journal is to report original research on all aspects of plastic deformation, damage and fracture behaviour of isotropic as well as anisotropic solids, including the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena.

حوزه های تحت پوشش : plastic deformation, damage, thermodynamics