Constitutive modeling of size effect on deformation behaviors of amorphous polymers in micro-scaled deformation
| Autor: | Mingwang Fu, Zhongqin Lin, Yujun Deng, Linfa Peng, X. M. Lai |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Couple stress Materials science Micrometer scale Scale (ratio) Mechanical Engineering Microfluidics Constitutive equation 02 engineering and technology Polymer 021001 nanoscience & nanotechnology Amorphous solid 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials General Materials Science Composite material Deformation (engineering) 0210 nano-technology |
| Zdroj: | International Journal of Plasticity. 89:197-222 |
| ISSN: | 0749-6419 |
| DOI: | 10.1016/j.ijplas.2016.11.011 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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