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Variation of strain rate sensitivity index of a superplastic aluminum alloy in different testing methods

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Majidi, Omid, Jahazi, Mohammad, Bombardier, Nicolas et Samuel, Ehab. 2017. « Variation of strain rate sensitivity index of a superplastic aluminum alloy in different testing methods ». In 20th International ESAFORM Conference on Material Forming (ESAFORM) (Dublin, Ireland, Apr. 26-28, 2017) Coll. « AIP Conference Proceedings », vol. 1896. USA : American Institute of Physics.
Compte des citations dans Scopus : 4.

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Abstract

The strain rate sensitivity index, m-value, is being applied as a common tool to evaluate the impact of the strain rate on the viscoplastic behaviour of materials. The m-value, as a constant number, has been frequently taken into consideration for modeling material behaviour in the numerical simulation of superplastic forming processes. However, the impact of the testing variables on the measured m-values has not been investigated comprehensively. In this study, the m-value for a superplastic grade of an aluminum alloy (i.e., AA5083) has been investigated. The conditions and the parameters that influence the strain rate sensitivity for the material are compared with three different testing methods, i.e., monotonic uniaxial tension test, strain rate jump test and stress relaxation test. All tests were conducted at elevated temperature (470°C) and at strain rates up to 0.1 s−1. The results show that the m-value is not constant and is highly dependent on the applied strain rate, strain level and testing method.

Item Type: Conference proceeding
Professor:
Professor
Jahazi, Mohammad
Affiliation: Génie mécanique
Date Deposited: 22 Nov 2017 20:23
Last Modified: 15 May 2018 14:57
URI: https://espace2.etsmtl.ca/id/eprint/15975

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