Crystal plasticity finite element modelling of the effect of friction on surface asperity flattening in cold uniaxial planar compression

During uniaxial planar compression of annealed aluminium alloys, a novel approach to determine the surface asperity flattening (roughness R-a) is employed by analyzing the evolution of the surface's microtexture. With an increase in compression strain, the surface asperity tends to be flattened, and strain hardening increases. Lubrication can constrain the surface asperity flattening process and hinder the progress of grain surface flattening. The development of surface texture shows an obvious dependency: under the influence of friction, the normal deformation texture component (brass orientation {0 1 1} < 1 1 2 > can be generated easily, while lubrication can hinder this texture component generation. Simulated results show a good agreement with experimental results which predicated brass orientation. However, due to the limitation of the FCC Taylor model, the other orientation components cannot be predicted. (C) 2015 Elsevier B.V. All rights reserved.