Please use this identifier to cite or link to this item:
|Title:||Void interaction and coalescence in polymeric materials||Authors:||Cheng, L.
Softening and rehardening
|Issue Date:||15-Mar-2007||Citation:||Cheng, L., Guo, T.F. (2007-03-15). Void interaction and coalescence in polymeric materials. International Journal of Solids and Structures 44 (6) : 1787-1808. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ijsolstr.2006.08.007||Abstract:||Beyond pressure-sensitivity, plastic deformation of glassy polymers exhibits intrinsic softening followed by progressive rehardening at large strains. This highly nonlinear stress-strain behavior is captured by a constitutive model introduced in this work. In the first part of the paper, we focus on void growth and coalescence in an axisymmetric representative material volume consisting of a single large void and a population of discrete microvoids. Our study shows that microvoid cavitation, enhanced by strain softening, accelerates the process of void coalescence resulting in brittle-like failure at lowered stresses and strains. Pressure-sensitivity also reduces stress-carrying capacity as well as influences the strain for void coalescence; plastic dilatancy effects are relatively milder. In the second part of the paper, we introduce a population of discrete spherical voids within a three-dimensional computational model to study void growth and damage ahead of a crack front. Our studies reveal a distinctive change in the deformed void shape from oblate to prolate when strain softening is followed by high rehardening at large plastic strains. By contrast, an extended strain softening regime promotes oblacity and facilitates multiple void interaction and their cooperative growth over large distances ahead of the crack front. This multi-void failure mechanism is exacerbated by pressure-sensitivity. © 2006 Elsevier Ltd. All rights reserved.||Source Title:||International Journal of Solids and Structures||URI:||http://scholarbank.nus.edu.sg/handle/10635/86841||ISSN:||00207683||DOI:||10.1016/j.ijsolstr.2006.08.007|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 28, 2020
WEB OF SCIENCETM
checked on Sep 28, 2020
checked on Sep 27, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.