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Strain rate effects on the compressive property and the energy-absorbing capacity of aluminum alloy foams |
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| Authors: | Feng Yi Zhengang Zhu Fangqiou Zu Shisheng Hu Pan Yi |
| Affiliation: | a Laboratory of Internal Friction and Defects in Solids, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China b Department of Mechanics and Engineering, University of Science Technology of China, Hefei 230026, People's Republic of China |
| Abstract: | The strain rate sensitivity of various relative densities, open-cell aluminum alloy foams fabricated by a powder metallurgical method is investigated under compression loading. Their response to strain rate has been tested over a wide range of strain rates, from 10−3 to 2600 s−1 at room temperature. Within this range, the experimental results show that the yield strength and the energy absorbed increase with an increase of strain rate. However, the yield strength of higher relative density foams increases bilinearly with the logarithm of strain rate, and the yield strength of lower relative density foams shows only a linear increase. The compaction strain slightly decreases with an increase of strain rate. The higher relative density aluminum alloy foams are more sensitive to strain rate than the lower relative density foams. |
| Keywords: | Metallic foam Split Hopkinson pressure bar Yield strength Strain rate sensitivity Energy absorption |
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