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  4. A dislocation density based material model to simulate the anisotropic creep behavior of single-phase and two-phase single crystals
 
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2009
Journal Article
Titel

A dislocation density based material model to simulate the anisotropic creep behavior of single-phase and two-phase single crystals

Abstract
The primary and secondary creep behavior of single crystals is observed by a material model using evolution equations for dislocation densities on individual slip systems. An interaction matrix defines the mutual influence of dislocation densities on different glide systems. Face-centered cubic (fcc), body-centered cubic (bcc) and hexagonal closed packed (hcp) lattice structures have been investigated. The material model is implemented in a finite element method to analyze the orientation dependent creep behavior of two-phase single crystals. Three finite element models are introduced to simulate creep of a gamma' strengthened nickel base superalloy in < 100 >, < 110 > and < 111 > directions. This approach allows to examine the influence of crystal slip and cuboidal microstructure on the deformation process.
Author(s)
Preußner, J.
Rudnik, Y.
Brehm, H.
Völkl, R.
Glatzel, U.
Zeitschrift
International Journal of Plasticity
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DOI
10.1016/j.ijplas.2008.04.006
Language
English
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Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM
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