Constitutive modelling of the elastic-plastic behaviour of 7050-T7451 aluminium alloy

M. D. Kuruppu, J. F. Williams, N. Bridgford, R. Jones, D. C. Stouffer

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This paper presents an extension of the Ramaswamy, Stouffer, and Laflen unified elastic-viscoplastic theory which uses internal state variables to represent a strain rate insensitive aluminium alloy namely 7050-T7451 alloy. The model constants are evaluated from the results of a uniaxial tensile test, with strain hold at saturation, and a fatigue loop. Strain holds in the saturated region of tensile monotonic curves resulted in significant amounts of stress relaxation. The material response is cyclically stable and reveals a strong Bauschinger effect. There is a significant reduction in the yield stress between the initial yield and the subsequent tensile yield stress observed after a fully reversed fatigue cycle. All of these material characteristics were predicted successfully.

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalJournal of Strain Analysis for Engineering Design
Issue number2
Publication statusPublished - 1 Apr 1992
Externally publishedYes

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