Affiliation:
1. Department of Manufacturing and Engineering Systems, Brunenel University, Uxbridge, Middlesex UB8 3PH, U K.
Abstract
This paper examines flow and instability of a zinc-clad sheet used for the manufacture of car panels. Three forming properties are reported from off-axis tensile testing: (a) anisotropy in the plane of the sheet, (b) tensile instability and (c) homogeneity of deformation. The analysis correlates the directional flow behaviour using the Hill yield function (1)† as a basis for equivalence. This function explains satisfactorily the linear plastic strain paths and the variation in r values observed but does contract flow behaviour to a single curve. A subtangent is derived for the off-axis testpiece in terms of its orientation and two strain ratios referred to its axis. This is used to derive the limiting uniform strain that is found to remain constant in regions exterior to local neck formation. A condition is established for which the principal axes of stress and plastic strain remain coincident. It is shown, from the measured rotations of the principal material axes, that deformations conform to standard strain transformation equations upon removal of rigid-body rotations.
Subject
Applied Mathematics,Mechanical Engineering,Mechanics of Materials,Modeling and Simulation
Cited by
11 articles.
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1. Plane strain compression of aluminium alloy sheets;Materials & Design;2012-08
2. Relevant Cubic Grain Plank Plastic Strain Ratio (R) the Theory Research and Experiment;Advanced Materials Research;2011-05
3. Forming properties of four high-strength sheet steels;Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture;2006-11-01
4. PLASTIC INSTABILITY;Basic Engineering Plasticity;2006
5. Anisotropy in thin Canning sheet metals;Journal de Physique IV (Proceedings);2003-03