Mesoscopic Localized Deformations in Rubber-Toughened Blends

Pijnenburg, K.G.W.; Giessen, E. van der

doi:10.1021/bk-2000-0759.ch003

Cited by 1 publication

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“…Detailed 2D ÿnite element studies (e.g. References [4,5,7,11]) have shown that plastic ow in the matrix between the cavitated particles (often treated as voids, as done in the sequel) occurs by shear bands that evolve in size and shape with the overall deformation. This is an immediate consequence of the typical strain softening after yield and the subsequent orientation hardening (see inset in Figure 1(a)).…”

Section: The Concept Of a Shear Surfacementioning

confidence: 99%

“…The detailed 2D cell studies mentioned above [4][5][6][7]11] have shown that the plastic deformation around individual cavitated particles takes place in narrow shear bands in between two particles. This observation is the starting point for the coarse-grained model we introduce in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed ÿnite element computations of the deformation processes around one or two voids have been carried out under di erent remote loading conditions (e.g. References [4][5][6][7][8]). Cells with larger numbers of voids have recently been analysed in two dimensions (2D) but with somewhat less detail [9].…”

Section: Introductionmentioning

confidence: 99%

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A novel approach to the analysis of distributed shear banding in polymer blends

Pijnenburg

Giessen

2003

Numerical Meth Engineering

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SUMMARYThe toughness of glassy polymers can be enhanced by blending with rubber particles. The consensus is that this toughening is due to massive plastic deformation of the matrix that takes place once the particles have cavitated. Micromechanical studies of regular stackings of particles in a polymer matrix have provided much insight into the localized plastic ow in blends at the microscale of individual particles (or voids, once cavitated). Even some steps towards macroscopic constitutive models have been made. However, at intermediate length scales (i.e. larger than several particles, but smaller than the scale at which the material may be regarded as homogeneous) the situation is unclear. It is this length scale that becomes important around crack tips, for example, where a thorough understanding of the toughening e ect has to be derived from. In this paper, we therefore present a novel approach to the analysis of distributed shear banding in polymer-rubber blends. A coarse-grain description, in which much of the morphology is retained but the local shear banding is idealized into 'shear surfaces', will enable us to analyse ensembles with large numbers of particles. The parameters of this model will be validated with results from detailed cell analyses.

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Section: The Concept Of a Shear Surfacementioning

confidence: 99%