Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65823
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.
URI: http://hdl.handle.net/10397/65823
ISSN: 0749-6419
DOI: 10.1016/j.ijplas.2016.11.011
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