Constitutive Equations and Fracture Models for Sea Ice.
This final report summarizes research on deformation and fracture models for sea ice. In many cases results are compared with those for freshwater ice. Described first is work on modeling of primary creep for relatively short loading histories, studies on the applicability of linear elastic fracture...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1996
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA317988 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA317988 |
id |
ftdtic:ADA317988 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA317988 2023-05-15T16:37:17+02:00 Constitutive Equations and Fracture Models for Sea Ice. Rodin, G. J. Schapery, R. A. TEXAS UNIV AT AUSTIN DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS 1996 text/html http://www.dtic.mil/docs/citations/ADA317988 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA317988 en eng http://www.dtic.mil/docs/citations/ADA317988 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Mechanics *VISCOELASTICITY *FRACTURE(MECHANICS) *SEA ICE MATHEMATICAL MODELS STRESS ANALYSIS TIME DEPENDENCE DEFORMATION SINGLE CRYSTALS ICE MECHANICS CRACK PROPAGATION CREEP NONEQUILIBRIUM FLOW MICROMECHANICS GRAIN BOUNDARIES POLYCRYSTALLINE Text 1996 ftdtic 2016-02-19T19:14:11Z This final report summarizes research on deformation and fracture models for sea ice. In many cases results are compared with those for freshwater ice. Described first is work on modeling of primary creep for relatively short loading histories, studies on the applicability of linear elastic fracture mechanics to polycrystalline freshwater and sea ice, and finally a study on stress-transmission in polycrystals undergoing grain boundary sliding. Next, emphasis is on characterization of time-dependent deformation behavior of ice from short to very long-time behavior. This behavior requires the use of models that account for broad spectrum viscoelasticity. Linear viscoelasticity theory is used first in order to develop an understanding of how single-crystal creep produces broad-spectrum behavior of polycrystals through the mechanical interaction of single crystals. Guided by these results and then nonequilibrium thermodynamic principles, nonlinear viscoelastic constitutive equations are developed that make direct use of creep compliances predicted from the linear theory of polycrystals. While only theoretical work has been done on this grant, experimental data provided by others have been used to verify some of the predictions. Comparison of theory and experiment appears in some of the publications. Text Ice permafrost Sea ice Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Mechanics *VISCOELASTICITY *FRACTURE(MECHANICS) *SEA ICE MATHEMATICAL MODELS STRESS ANALYSIS TIME DEPENDENCE DEFORMATION SINGLE CRYSTALS ICE MECHANICS CRACK PROPAGATION CREEP NONEQUILIBRIUM FLOW MICROMECHANICS GRAIN BOUNDARIES POLYCRYSTALLINE |
spellingShingle |
Snow Ice and Permafrost Mechanics *VISCOELASTICITY *FRACTURE(MECHANICS) *SEA ICE MATHEMATICAL MODELS STRESS ANALYSIS TIME DEPENDENCE DEFORMATION SINGLE CRYSTALS ICE MECHANICS CRACK PROPAGATION CREEP NONEQUILIBRIUM FLOW MICROMECHANICS GRAIN BOUNDARIES POLYCRYSTALLINE Rodin, G. J. Schapery, R. A. Constitutive Equations and Fracture Models for Sea Ice. |
topic_facet |
Snow Ice and Permafrost Mechanics *VISCOELASTICITY *FRACTURE(MECHANICS) *SEA ICE MATHEMATICAL MODELS STRESS ANALYSIS TIME DEPENDENCE DEFORMATION SINGLE CRYSTALS ICE MECHANICS CRACK PROPAGATION CREEP NONEQUILIBRIUM FLOW MICROMECHANICS GRAIN BOUNDARIES POLYCRYSTALLINE |
description |
This final report summarizes research on deformation and fracture models for sea ice. In many cases results are compared with those for freshwater ice. Described first is work on modeling of primary creep for relatively short loading histories, studies on the applicability of linear elastic fracture mechanics to polycrystalline freshwater and sea ice, and finally a study on stress-transmission in polycrystals undergoing grain boundary sliding. Next, emphasis is on characterization of time-dependent deformation behavior of ice from short to very long-time behavior. This behavior requires the use of models that account for broad spectrum viscoelasticity. Linear viscoelasticity theory is used first in order to develop an understanding of how single-crystal creep produces broad-spectrum behavior of polycrystals through the mechanical interaction of single crystals. Guided by these results and then nonequilibrium thermodynamic principles, nonlinear viscoelastic constitutive equations are developed that make direct use of creep compliances predicted from the linear theory of polycrystals. While only theoretical work has been done on this grant, experimental data provided by others have been used to verify some of the predictions. Comparison of theory and experiment appears in some of the publications. |
author2 |
TEXAS UNIV AT AUSTIN DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS |
format |
Text |
author |
Rodin, G. J. Schapery, R. A. |
author_facet |
Rodin, G. J. Schapery, R. A. |
author_sort |
Rodin, G. J. |
title |
Constitutive Equations and Fracture Models for Sea Ice. |
title_short |
Constitutive Equations and Fracture Models for Sea Ice. |
title_full |
Constitutive Equations and Fracture Models for Sea Ice. |
title_fullStr |
Constitutive Equations and Fracture Models for Sea Ice. |
title_full_unstemmed |
Constitutive Equations and Fracture Models for Sea Ice. |
title_sort |
constitutive equations and fracture models for sea ice. |
publishDate |
1996 |
url |
http://www.dtic.mil/docs/citations/ADA317988 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA317988 |
genre |
Ice permafrost Sea ice |
genre_facet |
Ice permafrost Sea ice |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA317988 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027576317313024 |