Extreme Energy Absorption in Glassy Polymer Thin Films by Supersonic Micro-projectile Impact
| Autor: | Mujin Zhou, Ramathasan Thevamaran, Jinho Hyon, Omri Fried, David Veysset, Steven E. Kooi, Olawale Lawal, Edwin L. Thomas, Sadegh Yazdi, Jason K. Streit, Yang Jiao, Richard A. Vaia, Ming-Siao Hsiao |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Crazing Mechanical Engineering Perforation (oil well) 02 engineering and technology Deformation (meteorology) Plasticity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Viscoelasticity 0104 chemical sciences Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science chemistry.chemical_compound Brittleness chemistry Mechanics of Materials Ultimate tensile strength General Materials Science Polystyrene Composite material 0210 nano-technology |
| Zdroj: | Materials Today. 21:817-824 |
| ISSN: | 1369-7021 |
| DOI: | 10.1016/j.mattod.2018.07.014 |
| Popis: | The nature of polymer deformation depends on the ability of the chain segments to respond to the applied load at the imposed loading rate. When the polymer response time is significantly longer than the loading duration, the polymer responds in a brittle manner. Polystyrene, for example, is a brittle, glassy solid at room temperature and absorbs very little energy during deformation. Here we show unexpected, thickness and strain-rate-dependent deformation processes in thin polystyrene films at extreme axisymmetric tensile deformation rates. The impact of a supersonic micro-projectile initiates crazing, yielding, and adiabatic heating leading to extensive plastic flow of a load-bearing viscoelastic melt prior to perforation and film rupture. The less entangled, more mobile near-surface regions of these freestanding films favorably modify these processes, increasing the specific energy absorption as thickness decreases at the highest impact velocity. This results in unprecedented energy absorption at extreme strain rates in what is normally considered a brittle material. |
| Databáze: | OpenAIRE |
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