Macroscopic yield in cavitated polymer blends

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:38

Article

Pijnenburg, KGW ; Van der Giessen, E

关键词: polymer blends;    Gurson model;    Gurson formulation;   

DOI  :  10.1016/S0020-7683(00)00227-4

来源: Elsevier

【 摘 要 】

Polymer blends in which the rubber particles have cavitated may be regarded as porous materials. The yield behaviour of many porous media can be well described with the Gurson model. Polymers, however, are characterized by large elastic strains prior to yield. These effects are neglected in the original Gurson formulation, which, as will be shown, leads to an overestimation of the yield stress for the voided blend. The localization of polymer plasticity in narrow shear bands also results in deviations from the standard theory. This paper presents two-dimensional cell calculations of a voided polymer and demonstrates that the overall yield characteristics are not represented well by the Gurson potential. A modification of this potential is proposed that accounts for elasticity effects and shear banding and gives better agreement with the cell results. The new potential is generalized to a full three-dimensional continuum model for voided polymer blends. (C) 2001 Elsevier Science Ltd. All rights reserved.

【 授权许可】

Free