Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte
The aim of this work is the derivation of material parameters of polar firn as a function of its density to describe the time-dependent deformation behaviour under compressive stress. The total pressure corresponding to the in situ depths of the firn layer is taken into account. The linear and the n...
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Language: | German |
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Universität Bremen
2010
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/2766 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000117719 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2766 2023-05-15T13:42:31+02:00 Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte Materialparameters for the modelling of the nonlinear time-dependend deformation behaviour of polar firn under compressive stress Bässler, Karl-Heinz Miller, Heinrich Huhn, Katrin 2010-02-22 application/pdf https://media.suub.uni-bremen.de/handle/elib/2766 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000117719 ger ger Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/2766 urn:nbn:de:gbv:46-diss000117719 info:eu-repo/semantics/openAccess material parameters of polar firn time-dependent deformation behaviour compressive stress nonlinear stress-strain relation settlement measurements in boreholes Georg von Neumayer Station in Antarctica time-independent linear deformation behaviour uniaxial and triaxial compression and creep tests on "in-situ ice cores" nonlinear constitutive equitation 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2010 ftsubbremen 2022-11-09T07:09:53Z The aim of this work is the derivation of material parameters of polar firn as a function of its density to describe the time-dependent deformation behaviour under compressive stress. The total pressure corresponding to the in situ depths of the firn layer is taken into account. The linear and the nonlinear stress-strain relation will be investigated. The use of simple constitutive equitation to describe settlement measurements in boreholes near the Georg von Neumayer Station in Antarctica yields material parameters to describe the time-independent linear deformation behaviour. Results of uniaxial and triaxial compression and creep tests on "in-situ ice cores" under high pressure are first described by a nonlinear constitutive equitation which yields the material parameters without consideration of the time dependency. A further consideration with the same nonlinear constitutive equitation will take into account the time dependency, and the resulting density-dependent material parameters will be identified. After conversion of the constitutive equitation to calculate the stress and in consideration of the strain at failure compressive strength are calculated. The indirect theoretically determined compressive strength (follows the above mentioned procedure) correspond well with those identified in laboratory tests. Doctoral or Postdoctoral Thesis Antarc* Antarctica Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Georg von Neumayer Station ENVELOPE(-8.367,-8.367,-70.617,-70.617) Neumayer Neumayer Station |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
German |
topic |
material parameters of polar firn time-dependent deformation behaviour compressive stress nonlinear stress-strain relation settlement measurements in boreholes Georg von Neumayer Station in Antarctica time-independent linear deformation behaviour uniaxial and triaxial compression and creep tests on "in-situ ice cores" nonlinear constitutive equitation 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
material parameters of polar firn time-dependent deformation behaviour compressive stress nonlinear stress-strain relation settlement measurements in boreholes Georg von Neumayer Station in Antarctica time-independent linear deformation behaviour uniaxial and triaxial compression and creep tests on "in-situ ice cores" nonlinear constitutive equitation 550 550 Earth sciences and geology ddc:550 Bässler, Karl-Heinz Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
topic_facet |
material parameters of polar firn time-dependent deformation behaviour compressive stress nonlinear stress-strain relation settlement measurements in boreholes Georg von Neumayer Station in Antarctica time-independent linear deformation behaviour uniaxial and triaxial compression and creep tests on "in-situ ice cores" nonlinear constitutive equitation 550 550 Earth sciences and geology ddc:550 |
description |
The aim of this work is the derivation of material parameters of polar firn as a function of its density to describe the time-dependent deformation behaviour under compressive stress. The total pressure corresponding to the in situ depths of the firn layer is taken into account. The linear and the nonlinear stress-strain relation will be investigated. The use of simple constitutive equitation to describe settlement measurements in boreholes near the Georg von Neumayer Station in Antarctica yields material parameters to describe the time-independent linear deformation behaviour. Results of uniaxial and triaxial compression and creep tests on "in-situ ice cores" under high pressure are first described by a nonlinear constitutive equitation which yields the material parameters without consideration of the time dependency. A further consideration with the same nonlinear constitutive equitation will take into account the time dependency, and the resulting density-dependent material parameters will be identified. After conversion of the constitutive equitation to calculate the stress and in consideration of the strain at failure compressive strength are calculated. The indirect theoretically determined compressive strength (follows the above mentioned procedure) correspond well with those identified in laboratory tests. |
author2 |
Miller, Heinrich Huhn, Katrin |
format |
Doctoral or Postdoctoral Thesis |
author |
Bässler, Karl-Heinz |
author_facet |
Bässler, Karl-Heinz |
author_sort |
Bässler, Karl-Heinz |
title |
Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
title_short |
Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
title_full |
Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
title_fullStr |
Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
title_full_unstemmed |
Materialparameter zur Beschreibung des zeitabhängigen nichtlinearen Spannungsverformungsverhaltens von Firn in Abhängigkeit von seiner Dichte |
title_sort |
materialparameter zur beschreibung des zeitabhängigen nichtlinearen spannungsverformungsverhaltens von firn in abhängigkeit von seiner dichte |
publisher |
Universität Bremen |
publishDate |
2010 |
url |
https://media.suub.uni-bremen.de/handle/elib/2766 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000117719 |
long_lat |
ENVELOPE(-8.367,-8.367,-70.617,-70.617) |
geographic |
Georg von Neumayer Station Neumayer Neumayer Station |
geographic_facet |
Georg von Neumayer Station Neumayer Neumayer Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2766 urn:nbn:de:gbv:46-diss000117719 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766168750272282624 |