Please use this identifier to cite or link to this item:
Title: Constitutive modeling of size effect on deformation behaviors of amorphous polymers in micro-scaled deformation
Authors: Deng, YJ
Peng, LF
Lai, XM
Fu, MW 
Lin, ZQ
Keywords: Constitutive behavior
Elastic-viscoplastic material
Polymeric material
Size effect
Issue Date: 2017
Publisher: Pergamon Press
Source: International journal of plasticity, 2017, v. 89, p. 197-222 How to cite?
Journal: International journal of plasticity 
Abstract: With the advantages of high-formability, low-cost and unique physical properties, polymers have been widely used in microforming of polymeric components for a large scale of applications in many fields including micro-optics, microfluidic and sensors, etc. In micro-scale, the deformation behaviors of polymers are observed to be size-dependent. Conventional constitutive models of polymers, however, cannot predict and represent those size-dependent behaviors well. To address this issue, a constitutive model with consideration of size effect for amorphous polymers in micro-scale was developed in this research. Firstly, on the basis of the couple stress theory, the impact of rotational gradients was taken into consideration and a strain gradient “elastic-viscoplastic” constitutive model was proposed to quantitatively describe the size-dependent behaviors of amorphous polymers in micro-scale. After that, four point micro-bending experiments were implemented on poly (methyl methacrylate) (PMMA) films with thickness varying from the millimeter scale to micrometer scale. The size effect of PMMA in micro-scale was further illustrated and the proposed strain gradient “elastic-viscoplastic” model was finally validated and verified for the capability of modeling of the size effect of amorphous polymers in micro-scaled deformation. This research thus advances the understanding of the size effect and the strain gradient based mechanical behaviors of amorphous polymers and facilitates its applications in industries.
ISSN: 0749-6419
DOI: 10.1016/j.ijplas.2016.11.011
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Oct 18, 2018


Last Week
Last month
Citations as of Oct 12, 2018

Page view(s)

Last Week
Last month
Citations as of Oct 14, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.