Abstract
One of the main aims of the paper is to develop proper criteria in order to avoid the occurence of internal defects such as split ends and central burst which can arise during rolling of metallic products. Using an upper bound method with assumption of a rigid body uni-triangular velocity field for deformation zone the model of these defects is proposed. The power solutions obtained for analysed cases allowed to classify the rolling parameters into safe and defect ranges. The suggested upper bound model has been compared with the rigid-plastic finite-element approach and the stress distribution across the workpiece at the exit plane has been calculated using this approach. The finite element calculations and results obtained from experimental rolling of aluminum alloy confirm the criteria obtained by the upper bound method. Both, perfectly plastic and strain-hardening materials are studied. It has been found that split end iand internal burst formation is more likely to ocur in thick plates and sheets when small reduction are applied.
Published Version
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