Successively refined models for crack tip plasticity in polymer blends

Abstract

This paper is concerned with a comparative study of different, partly complementary micromechanical models for crack tip plasticity in polymer-rubber blends. It is experimentally well established that interspersion of micron-scale rubber particles into a polymer matrix can lead to a significantly enhanced toughness of the material. The last two decades have witnessed growing consensus about the underlying mechanisms: particle cavitation, void growth, crazing, and shear yielding. Cavitation of the particles followed by massive shear yielding of the matrix and the resulting dissipation of energy is believed to give blends their improved toughness. At the very microlevel, i.e. at length scales of the order of the micron-sized rubber particles, the key damage processes are well identified and largely understood. Their effect on the macroscopic scale may well be captured in a homogenized sense by continuum models, e.g. of the Gurson-type when focusing on void growth. However, at the scale of a crack, a complete and tractable model incorporating all relevant deformation mechanisms is not yet available. On the one hand, strong gradients of the stress fields violate the assumption of a sufficiently homogeneous material for a continuum representation to be valid, while on the other hand the length scale involved is too large in practice to model all particles individually. Therefore, in this paper several models for crack- tip plasticity in blends are combined and compared. Although none of the models introduced pretends to be the final answer, they all shed some light on parts of the solution

Continuum approach for modeling fatigue in amorphous glassy polymers. Applications to the investigation of damage-ratcheting interaction in polycarbonate

“…from Lesser (2002); Janssen et al (2008b); Drozdov (2011); Del Vecchio et al (2014); Lugo et al (2014); Xi et al (2015); Mortazavian and Fatemi (2015). To explore microstructural characteristics of polymers with regard to their fracture toughness, the damage mechanisms ahead of the crack tip have been paid considerable attention, see Li and Chandra (2003); Pijnenburg et al (2005); Pasta (2011) including references therein. Much research has also devoted to the investigation of fatigue crack propagation in polymers and their compounds, see Fang et al (2008); Nittur et al (2013); Ravi Chandran (2016); Kanters et al (2016) to mention a few.…”

Mode mixity and nonlinear viscous effects on toughness of interfaces

“…In the sense of homogenization, the layer of cell elements can represent the whole process zone regardless of how many rows of microvoids it is composed of. Nevertheless, strong gradients of the stress fields violate the assumption of a sufficiently homogeneous material for a continuum representation to be valid, while on the other hand the length scale involved is too large in practice to model all voids individually (Tijnenburg et al, 2005). We next account for several rows of voids in the steady-state fracture process zone.…”

Characterization of material ductility of PP/EPR/talc blend under wide range of stress triaxiality at intermediate and high strain rates

“…[35][36][37][38] RADIOSS offers the way to introduce an advanced material model into a numerical scheme through user-defined subroutine: User Material Laws. Two subroutines for one material model had to be developed for RADIOSS STARTER and RADIOSS ENGINE, respectively.…”