Bauschinger effect
The Bauschinger effect (named after Johann Bauschinger ) is the directional change in the elastic limit of a ( polycrystalline ) metal or alloy after a primary plastic deformation . If a metal is first deformed in one direction so that it is plastically deformed and then deformed in the opposite direction, the elastic limit is lower in the opposite direction. The reason for this are the restoring forces from pent-up dislocations (defects or imperfections) in the material.
The Bauschinger effect corresponds to an elastic-plastic model of an element connected in parallel consisting of a spring (Hooke's elasticity) and a friction element (Coulomb friction), as well as another spring connected in series.
See also
literature
- Johann Bauschinger : About the change in the elastic limit and the strength of iron and steel through stretching and squeezing, through heating and cooling and through often repeated stresses , Mitth. Vol. 13 (1886) ;
- Hubert Hoff : Observations on the Bauschinger effect on soft and medium-hard steels ; Düsseldorf: Verlag Stahleisen, 1958
- Manfred Dietz : Contribution to the nature and causes of the Bauschinger effect ; Zwickau: Diss. A, Zwickau Engineering College, 1977 (Part 1: 175 sheets, Part 2: 41 sheets). ( Link to the dataset at the DNB )