Acharya, Saikat and Gupta, R K and Ghosh, Jiten and Bysakh, Sandip and Ghosh, K S and Mondal, D K and Mukhopadhyay, Anoop Kumar (2017) High strain rate dynamic compressive behaviour of Al6061-T6 alloys. Materials Characterization, 127. pp. 185-197. ISSN 1044-5803

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This paper investigated the compression behaviour of Al 6061-T6 alloys at various high strain rates through split Hopkinson pressure bar (SHPB) experiments. The compressive strength (sigma(c)) of Al 6061-T6 alloy was measured in the present work as a function of high strain rate ((epsilon) Over dot). The measurements were done in the strain rate regime of 3 x 10(3) to 6.5 x 10(3) s(-1). The results showed that the corresponding (sigma(c)) increased exponentially with increase in ((epsilon) Over dot). But, the increase in strain with increasing ((epsilon) Over dot) was primarily linear. The work hardening coefficient decreased with the increase of strain. However, the decrease of work hardening coefficient with increasing strain rate did not follow a similar trend. With the increase of ((epsilon) Over dot) the strain rate sensitivity increased. As expected, the thermal activation volume decreased with increase in ((epsilon) Over dot). Using the Zerilli-Armstrong equation attempt was made to evaluate the related material constants to predict the stress-strain curves. The predicted stress-strain behaviours matched reasonably well with those measured experimentally in the current SHPB experiments. The implication of these results in engineering design and simulation in the context of resisting high strain rate impact was also discussed. (C) 2017 Elsevier Inc. All rights reserved.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 18 Jan 2018 09:57
Last Modified: 18 Jan 2018 09:57

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