Size effect in microcompression of polystyrene micropillars
| Autor: | Sumit Basu, Shantanu Bhattacharya, Thimmappa Shetty Guruprasad |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Work (thermodynamics) Materials science Polymers and Plastics Organic Chemistry Constitutive equation Nanotechnology 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Polymer particle chemistry.chemical_compound chemistry 0103 physical sciences Materials Chemistry Load displacement Polystyrene Composite material 0210 nano-technology Beam (structure) Microfabrication |
| Zdroj: | Polymer. 98:118-128 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2016.06.010 |
| Popis: | Experiments by He et al. [J.Y. He, Z.L. Zhang, M. Midttun, G. Fonnum, G.I. Modahl, H. Kristiansen, and K. Redford. Size effect on mechanical properties of micron-sized PS-DVB polymer particles. Polymer 2008, 49(18), 3993] have indicated that polymers exhibit enhancement of strength at length scales of the order of microns. This is surprising since size effects, widely reported for FCC metals, owe their origin to the presence of crystalline defects, particularly dislocations. On the other hand, polymers being a material of choice in microfabrication, these results assume technological importance. In this work, we conduct controlled experiments on polystyrene (PS) micropillars to ascertain whether they exhibit size effects. The pillars are microfabricated and hence free of beam damage. The experimental load displacement curves obtained from microcompression experiments are matched with computer simulations on similar samples using a well-calibrated constitutive model. Our results demonstrate significant intrinsic size effect on the yield strength, though effects of size on rehardening response turned out to be an experimental artifact. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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