A Theory of the Hysteretic Contribution to Internal Friction; Thermomechanical Unpinning of Dislocations
- 1 August 1968
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 39 (9), 4428-4437
- https://doi.org/10.1063/1.1656987
Abstract
The thermomechanical unpinning and repinning of dislocation lines pinned at equidistant points are analyzed. The hysteretic type of internal friction which results from this unpinning is calculated using a computer program which allows an examination of the effects of stress, temperature, frequency, dislocation‐pin interaction energy, dislocation loop length, and density of pinning points. It is shown that the internal friction due to thermomechanical unpinning is a function of the above variables. The hysteretic damping exhibits a maximum as a function of temperature, frequency, and stress, and the characteristics of these peaks are examined. A brief comparison of the calculated damping with the experimental results is made and it is shown that the theory can qualitatively account for the features of deformation produced damping peaks such as the Bordoni and Hasiguti peaks.Keywords
This publication has 22 references indexed in Scilit:
- High-Temperature Internal Friction in Potassium ChlorideJournal of Applied Physics, 1966
- Solute atom-dislocation binding in dilute copper alloysActa Metallurgica, 1966
- Contribution à I'analyse du frottement interne dépendant de I'amplitude de déformationPhysica Status Solidi (b), 1966
- A theory of internal friction peak due to thermal unpinning of dislocations and its application to P1 peak in copperActa Metallurgica, 1965
- Acoustic attenuation studies of the frictional force on a fast moving dislocationActa Metallurgica, 1964
- Entropy Factors for Thermally Activated Unpinning of DislocationsJournal of Applied Physics, 1964
- Theory of the Thermal Breakaway of a Pinned Dislocation Line with Application to Damping PhenomenaJournal of Applied Physics, 1964
- An Extension of a Theory of Mechanical Damping Due to DislocationsJournal of Applied Physics, 1962
- Dislocation damping in metalsAdvances in Physics, 1960
- Theory of Mechanical Damping Due to DislocationsJournal of Applied Physics, 1956