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

Item

Title
Suppression of the Bauschinger Effect and Changes in Flow Pattern of Ductile Metals Caused by Cyclic Torsional Strains
Creator
Polakowski, N. H.
Date
1963
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.
Date Issued
1963
Extent
11
Corporate Author
Illinois Inst. of Tech. Dept. of Metallurgical Engineering
Report Number
AFOSR-64-0412
Contract
AF 49(638)308
Distribution Conflict
No
Index In
Air Force Scientific Research Bibliography 1963-1964 (1970), p. 200
Distribution Classification
2
DTIC Record Exists
No
Report Availability
Not available via Contrails
Type
report
Item sets
Illinois Tech Related