2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 7: Yang Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Aifantis E, Wang H, Zhu T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 190 pages |
| ISBN: | 978-1-987820-48-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Constitutive model for macro-yield behaviors of amorphous glassy polymers: evolution of sub-entanglement micro-structure
Han JIANG1; ChengKai Jiang1; Guozheng Kang2;1SOUTHWEST JIAOTONG UNIVERSITY, Chengdu, China; 2APPLIED MECHANICS AND STRUCTURE SAFETY KEY LABORATORY OF SICHUAN PROVINCE, SCHOOL OF MECHANICS AND ENGINEERING, SOUTHWEST JIAOTONG UNIVERSITY, Chengdu, China;
Type of Paper: Regular
Id Paper: 337
Topic: 1
Abstract:
A finite elastic-viscoplastic constitutive model was proposed to study the influence of evolution of micro-structure on the macro-yield phenomena of amorphous glassy polymers. Within the rigorously irreversible thermodynamic framework, an internal-state variable, namely the sub-entanglement which is defined as the non-permanent entanglement, is employed to describe the macro-yield phenomena, i.e. the pre-yield nonlinearity, macro-yield transition and post-yielding softening. The initial density and the evolution of sub-entanglement during load application show an important effect on the macro-yield behaviors. The physical meanings of the parameters associated with the sub-entanglement evolution have been discussed. Thermal treatment histories will affect the initial density of sub-entanglement strongly. The capability of the proposed model was validated by predicting the deformation behavior of amorphous glassy polymers. The thermomechanical history dependent characteristics of the macro-yield behavior can be reproduced by the proposed model via the material parameters related to the sub-entanglement.