Warm compression tests of aluminum alloy |
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Authors: | O Aluko M B Adeyemi |
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Affiliation: | (1) Department of Mechanical Engineering, University of Ilorin, Ilorin, Nigeria |
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Abstract: | Compression tests of aluminum alloy were experimentally investigated at specified temperatures ranging from 30 ‡C (room temperature)
to 250 ‡C under a constant strain rate of 0.2 X 10-3/s using powdered graphite as a lubricant throughout the tests. The effective stress method is found to show a significant
fall in stress values beyond the barreling point, indicating a serious shortcoming over the barrel correction factor method
within the tested temperature range. The compression curves obtained using the barrel correction factor method and the Bridgman
remachining technique (no barreling allowed during the test) are found to have close values, even at higher temperatures.
The true-stress versus true-strain curves and the barrel sizes obtained follow empirical power laws, even at higher test temperatures. |
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Keywords: | barreling power law true strain true stress warm compression |
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