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From transient to steady state deformation and grain size: A thermodynamic approach using elasto-visco-plastic numerical modeling

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cris.virtual.author-orcid0000-0001-7323-4199
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cris.virtualsource.author-orcid4a7fb6c5-1fff-482e-9dcb-223d47fc2283
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dc.contributor.authorHerwegh, Marco
dc.contributor.authorPoulet, T.
dc.contributor.authorKarrech, A.
dc.contributor.authorRegenauer-Lieb, K.
dc.date.accessioned2024-10-15T06:14:57Z
dc.date.available2024-10-15T06:14:57Z
dc.date.issued2014
dc.description.abstractNumerical simulation experiments give insight into the evolving energy partitioning during high-strain torsion experiments of calcite. Our numerical experiments are designed to derive a generic macroscopic grain size sensitive flow law capable of describing the full evolution from the transient regime to steady state. The transient regime is crucial for understanding the importance of micro structural processes that may lead to strain localization phenomena in deforming materials. This is particularly important in geological and geodynamic applications where the phenomenon of strain localization happens outside the time frame that can be observed under controlled laboratory conditions. Ourmethod is based on an extension of the paleowattmeter approach to the transient regime. We add an empirical hardening law using the Ramberg-Osgood approximation and assess the experiments by an evolution test function of stored over dissipated energy (lambda factor). Parameter studies of, strain hardening, dislocation creep parameter, strain rates, temperature, and lambda factor as well asmesh sensitivity are presented to explore the sensitivity of the newly derived transient/steady state flow law. Our analysis can be seen as one of the first steps in a hybrid computational-laboratory-field modeling workflow. The analysis could be improved through independent verifications by thermographic analysis in physical laboratory experiments to independently assess lambda factor evolution under laboratory conditions.
dc.description.numberOfPages19
dc.description.sponsorshipInstitut für Geologie
dc.identifier.doi10.7892/boris.47033
dc.identifier.publisherDOI10.1002/2013JB010701
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/118232
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.ispartofJournal of geophysical research
dc.relation.issn0148-0227
dc.relation.organizationDCD5A442C18FE17DE0405C82790C4DE2
dc.relation.organizationDCD5A442C1E1E17DE0405C82790C4DE2
dc.relation.organizationDCD5A442C41FE17DE0405C82790C4DE2
dc.subject.ddc500 - Science::550 - Earth sciences & geology
dc.titleFrom transient to steady state deformation and grain size: A thermodynamic approach using elasto-visco-plastic numerical modeling
dc.typearticle
dspace.entity.typePublication
dspace.file.typetext
oaire.citation.endPage918
oaire.citation.issue2
oaire.citation.startPage900
oaire.citation.volume119
oairecerif.author.affiliationInstitut für Geologie
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unibe.description.ispublishedpub
unibe.eprints.legacyId47033
unibe.journal.abbrevTitleJ GEOPHYS RES
unibe.refereedTRUE
unibe.subtype.articlejournal

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