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Suppression of the Bauschinger Effect and Changes in Flow Pattern of Ductile Metals Caused by Cyclic Torsional Strains

Report Number: AFOSR-64-0412
Author(s): Polakowski, N. H.
Corporate Author: Illinois Inst. of Tech. Dept. of Metallurgical Engineering
Date of Publication: 1963
Pages: 11
Contract: AF 49(638)308

Abstract:
The Bauschinger effect, defined as the difference in yield stresses for continued and reversed straining, essentially disappears after a series of stress cycles of decreasing amplitude. This applies to annealed and initially cold-worked metals alike, although in the latter case the change is accompanied by an over-all decrease of the yield stress (fatigue softening). The attenuation of the Bauschinger effect also leads to a conspicuous change in the deformation mode of cold-worked (drawn, stretched) metals during subsequent continuous torsion. The ordinarily observed propagation of flow by Lüders-type shear bands recedes or, if the initial workhardening was moderate, it can be completely suppressed and replaced by homogeneous flow. This is indicative of a relation between the degree of work softening and the development and subsequent stabilization of the Bauschinger effect with increasing prestrain.

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