Date: 15 Dec 2009

The evolution of yielding in 7075-O aluminium alloy: experimental observations and modelling

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It is widely accepted that the yielding of materials can be modelled to a satisfactory degree of accuracy. However the hardening behaviour is a topic that needs attention. Recent experiments explored the evolution of hardening of sheet metals with off-axis straining, raising much debate about the nature of the behaviour. In light of these results this paper aims to characterise the hardening behaviour observed due to pre-straining in the sheet rolling direction. Aluminium alloy 7075-O is used for the examination. Further to this, the adequacy of the Leacock (2006) yield criterion in representing this behaviour is assessed. Using this representation the discrete yielding behaviour of 7075-O is successfully modelled.