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A Proposal of a Constitutive Description for Aluminium Alloys in Both Cold and Hot Working

Mechanical, Energetics and Materials Engineering Department, Public University of Navarre, Campus Arrosadía s/n, Navarra 31006, Spain
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Metals 2016, 6(10), 244;
Received: 1 July 2016 / Revised: 29 September 2016 / Accepted: 29 September 2016 / Published: 17 October 2016
The most important difficulties when the behaviour of a part that is subjected to external mechanical forces is simulated deal with the determination of both the material thermo-mechanical properties and its boundary conditions. The accuracy of the results obtained from the simulation is directly related to the knowledge of the flow stress curve. Therefore, the determination of a material flow rule which is valid for both a wide temperature range and different initial deformation conditions in the starting material presents a great deal of interest when simulation results close to the experimental values are required to be obtained. In this present study, a novel flow stress curve is proposed that is able to accurately predict the behaviour of both materials with no previous accumulated strain and materials that have been previously subjected to severe plastic deformation processes. Moreover, it is possible to use it both for hot and cold working. The results are analysed in a wide test temperature range, which varies from room temperature to 300 °C, and from material previously processed by angular channel extrusion or with no previous strain accumulated. It is shown that the flow rule proposed is effective to model the material behaviour in a wide temperature range and it makes it possible to take the recrystallization phenomena that appear in previously deformed materials into account. In addition, the results obtained are compared with those predicted by other flow rules that exist in the prior literature. Furthermore, the study is complemented with finite element simulations and with a comparison between simulation and experimental results. View Full-Text
Keywords: metal forming; flow stress; ECAP; modelling metal forming; flow stress; ECAP; modelling
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MDPI and ACS Style

León, J.; Luis, C.J.; Fuertes, J.P.; Puertas, I.; Luri, R.; Salcedo, D. A Proposal of a Constitutive Description for Aluminium Alloys in Both Cold and Hot Working. Metals 2016, 6, 244.

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