The phenomenon in which a metal plastically deformed in one direction yields at a lower stress when loaded in the reverse direction. It is caused by back stresses from piled-up dislocations and the like.
Japanese name: バウシンガー効果
Bauschinger effect appears in 1 practice question across 1 topic, including Strengthening mechanisms and dislocations.
Answer: A. Dislocations piled up against obstacles during tension leave an internal stress in the opposite direction (back stress), which assists deformation in the reverse direction
During tension, dislocations pile up against grain boundaries, precipitates and clusters of other dislocations, and Orowan loops remain around hard particles. These create an internal stress (back stress) that opposes the tensile deformation and assists deformation in the reverse direction. So when the loading is reversed, the back stress acts to push the dislocations back, and compression begins at a lower stress. Gathering or collapse of vacancies cannot explain it. Grain refinement, through the Hall–Petch relationship, raises both the tensile and the compressive yield stress, so it cannot be why only the compressive one falls. The Bauschinger effect must be taken into account in analyzing members under cyclic loading, in reverse bending of sheet and in assessing the strength of formed steel pipe.
The Bauschinger effect must be taken into account in analyzing members under cyclic loading, in reverse bending of sheet and in assessing the strength of formed steel pipe.
When a metal is plastically deformed in tension, unloaded a…Dislocation Hall–Petch relationship Critical resolved shear stress Dispersion strengthening Orowan mechanism Peierls stress Schmid factor Taylor factor