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http://hdl.handle.net/10397/106732
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 |
Issue Date: | Feb-2017 | Source: | International journal of plasticity, Feb. 2017, v. 89, p. 197-222 | 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. | Keywords: | Constitutive behavior Elastic-viscoplastic material Polymeric material Size effect |
Publisher: | Pergamon Press | Journal: | International journal of plasticity | ISSN: | 0749-6419 | DOI: | 10.1016/j.ijplas.2016.11.011 | Rights: | © 2016 Elsevier Ltd. All rights reserved. © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Deng, Y. J., Peng, L. F., Lai, X. M., Fu, M. W., & Lin, Z. Q. (2017). Constitutive modeling of size effect on deformation behaviors of amorphous polymers in micro-scaled deformation. International Journal of Plasticity, 89, 197-222 is available at https://doi.org/10.1016/j.ijplas.2016.11.011. |
Appears in Collections: | Journal/Magazine Article |
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Fu_Constitutive_Modeling_Size.pdf | Pre-Published version | 2.67 MB | Adobe PDF | View/Open |
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