Dynamic shear testing of 2024 T351 aluminium at elevated temperature
| Autor: | R.A. Rahman Rashid, Stephen J. Cimpoeru, Nathan J. Edwards, Dong Ruan, Guoxing Lu, Muhammad Agus Kariem |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Universal testing machine Materials science Scanning electron microscope Mechanical Engineering chemistry.chemical_element 02 engineering and technology Split-Hopkinson pressure bar Strain rate Flow stress 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences chemistry Shear (geology) Mechanics of Materials Aluminium 0103 physical sciences Shear stress General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 754:99-111 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2019.03.033 |
| Popis: | 2024-T351 aluminium hat-shaped specimens have been used to experimentally investigate the effect of different initial test temperatures on the strain at which a thermo-plastic instability occurs. A universal testing machine and split Hopkinson pressure bar (SHPB) were used to determine resolved shear stress—nominal plastic shear strain for specimens tested at room temperature, 125 °C and 250 °C, respectively. The shear strain rates was 2 × 10−3 for quasi-static tests and ranged between 5 × 103 to 17.8 × 103 s−1 for dynamic tests. Microstructural observations using optical, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were presented to explain the observed mechanical properties. The flow stress of the 125 °C specimens tested at intermediate and high strain rate ( γ ˙ > 10 × 103 s−1) was higher than the flow stress of the room temperature specimens at the same rates. This is believed to be due to different precipitate types, leading to variable strain rate sensitivity as a function of temperature. No quantifiable effect of initial temperature on the strain at which the thermo-plastic instability occurs was identified. |
| Databáze: | OpenAIRE |
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