Formation and evolution of persistent slip bands in metals

The formation and evolution of persistent slip bands (PSB) in metals under fatigue is investigated. The metal is considered as an active medium of the activator-inhibitor type where the immobile dislocations play the role of the activator while the mobile ones that of the inhibitor. Persistent slip...

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Bibliographic Details
Published inJournal of the mechanics and physics of solids Vol. 48; no. 8; pp. 1761 - 1775
Main Authors Trochidis, A., Douka, E., Polyzos, B.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2000
Subjects
Dislocations
Microstructures
Stability and bifurcation
Stability and bifurcation
Microstructures
Dislocations
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Summary:The formation and evolution of persistent slip bands (PSB) in metals under fatigue is investigated. The metal is considered as an active medium of the activator-inhibitor type where the immobile dislocations play the role of the activator while the mobile ones that of the inhibitor. Persistent slip band formation is regarded as a result of spontaneous formation and evolution of localized dissipative structures in the form of solitary static regions. Analytical results for the wavelength of the pattern and the dislocation densities are obtained far from the bifurcation point. It is shown that the wavelength of the PSB pattern lies between two extreme values defined by the material properties and the excitation level. The obtained results are discussed and compared with available experimental observations.
ISSN:0022-5096
DOI:10.1016/S0022-5096(99)00077-0