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A method for the determination of the cyclic stress‐strain curve of presistent slip bands in fatigued single crystals
Author(s) -
Blochwitz C.,
Kahle E.
Publication year - 1980
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19800150818
Subject(s) - amplitude , lüders band , materials science , shear stress , saturation (graph theory) , slip (aerodynamics) , plasticity , critical resolved shear stress , cyclic stress , strain (injury) , composite material , analytical chemistry (journal) , physics , optics , thermodynamics , chemistry , mathematics , shear rate , microstructure , combinatorics , viscosity , medicine , chromatography
Single crystals of pure nickel oriented for single slip were fatigued at constant total strain amplitude (ε at ) at room temperature. The dependence of the saturation resolved shear stress amplitudes (τ as ) on the saturation plastic resolved shear strain amplitudes (γ aps ) (cyclic stress‐strain curve — CSSC) was determined. In the plateau range of the CSSC the volume fraction f of persistent slip bands (PSBs) was found to be linearly related to γ aps . The reduction of the total strain amplitude after saturation in the plateau range of the CSSC leads to the so‐called secondary CSSC with a slope n > 0 in the log‐log plot. From the secondary CSSC the ”true” cyclic stress‐strain curve of the PSB‐volume (PSB‐CSSC) can be determined. The method is based on the two assumptions that firstly the PSB‐groups (or ”macrobands”) penetrate the whole cross‐section of the specimen and secondly the volume fraction of PSBs in the secondary range of the CSSC remains constant.