{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25656"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25656","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The plastic behavior of predeformed ice crystals","abstract":"Analysis of previous plastic deformation experiments in ice has been complicated by the fact that the dislocation density changes during the experiment. To overcome this difficulty, measurements were made at stress levels lower than a predeformation value in an attempt to maintain constant dislocation densities. Creep, constant strain rate, and stress relaxation tests were performed as a function of stress, strain rate, temperature, and predeformation value. The response can be described in good approximation by a linear second order differential equation resulting from a combination of recoverable and non-recoverable components of dislocation strain. The dislocation viscosity results from a Snoek-type viscous drag arising from proton rearrangement in the stress field of the dislocations, as suggested by Weertman. Since the viscous drag constant at -100 C is about seven orders of magnitude greater than typical room temperature phonon drag constants, the deformation rate is limited by the viscosity, rather than by obstacles as in most materials. No evidence was found for electrical charge on the dislocations, or for a dislocation contribution to the decrement at 500 Hz or 10 MHz. No feature of the present results was inconsistent with the simple model proposed here, and ice is now perhaps one of the best understood plastic materials.","abstract_html":"Analysis of previous plastic deformation experiments in ice has been complicated by the fact that the dislocation density changes during the experiment. To overcome this difficulty, measurements were made at stress levels lower than a predeformation value in an attempt to maintain constant dislocation densities. Creep, constant strain rate, and stress relaxation tests were performed as a function of stress, strain rate, temperature, and predeformation value. The response can be described in good approximation by a linear second order differential equation resulting from a combination of recoverable and non-recoverable components of dislocation strain. The dislocation viscosity results from a Snoek-type viscous drag arising from proton rearrangement in the stress field of the dislocations, as suggested by Weertman. Since the viscous drag constant at -100 C is about seven orders of magnitude greater than typical room temperature phonon drag constants, the deformation rate is limited by the viscosity, rather than by obstacles as in most materials. No evidence was found for electrical charge on the dislocations, or for a dislocation contribution to the decrement at 500 Hz or 10 MHz. No feature of the present results was inconsistent with the simple model proposed here, and ice is now perhaps one of the best understood plastic materials.","abstract_has_math":false,"creators":["Joncich, David Michael"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Holder, J.T.","Granato, A.V."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-05T18:06:36Z","date_published":"2011-07-05T18:06:36Z","updated_at":"2026-07-22T22:25:24Z","subjects":["predeformed ice crystals","plastic behavior","ice crystals","creep","constant strain rate","stress relaxation"],"languages":["en"],"rights":["1976 David Michael Joncich"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["2300983"],"render_values":[{"text":"2300983","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25656","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Holder, J.T.","Granato, A.V."]},{"key":"dc:creator","label":"Author","values":["Joncich, David Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-05T18:06:36Z","10000-01-01","1976"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["predeformed ice crystals","plastic behavior","ice crystals","creep","constant strain rate","stress relaxation"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1976 David Michael Joncich"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["2300983","http://hdl.handle.net/2142/25656"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Analysis of previous plastic deformation experiments in ice has been complicated by the fact that the dislocation density changes during the experiment. To overcome this difficulty, measurements were made at stress levels lower than a predeformation value in an attempt to maintain constant dislocation densities. Creep, constant strain rate, and stress relaxation tests were performed as a function of stress, strain rate, temperature, and predeformation value. The response can be described in good approximation by a linear second order differential equation resulting from a combination of recoverable and non-recoverable components of dislocation strain. The dislocation viscosity results from a Snoek-type viscous drag arising from proton rearrangement in the stress field of the dislocations, as suggested by Weertman. Since the viscous drag constant at -100 C is about seven orders of magnitude greater than typical room temperature phonon drag constants, the deformation rate is limited by the viscosity, rather than by obstacles as in most materials. No evidence was found for electrical charge on the dislocations, or for a dislocation contribution to the decrement at 500 Hz or 10 MHz. No feature of the present results was inconsistent with the simple model proposed here, and ice is now perhaps one of the best understood plastic materials.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T18:06:36Z No. of bitstreams: 1 1976_joncich.pdf: 2525397 bytes, checksum: 928a2861c27ca2ac9bd1165cb7278b21 (MD5)","Made available in DSpace on 2011-07-05T18:06:36Z (GMT). No. of bitstreams: 1 1976_joncich.pdf: 2525397 bytes, checksum: 928a2861c27ca2ac9bd1165cb7278b21 (MD5) Previous issue date: 1976","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T18:06:36Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:39-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["The plastic behavior of predeformed ice crystals"]}]}],"canonical_facts":{"dc:contributor":["Holder, J.T.","Granato, A.V."],"dc:creator":["Joncich, David Michael"],"dc:date":["2011-07-05T18:06:36Z","10000-01-01","1976"],"dc:description":["Analysis of previous plastic deformation experiments in ice has been complicated by the fact that the dislocation density changes during the experiment. To overcome this difficulty, measurements were made at stress levels lower than a predeformation value in an attempt to maintain constant dislocation densities. Creep, constant strain rate, and stress relaxation tests were performed as a function of stress, strain rate, temperature, and predeformation value. The response can be described in good approximation by a linear second order differential equation resulting from a combination of recoverable and non-recoverable components of dislocation strain. The dislocation viscosity results from a Snoek-type viscous drag arising from proton rearrangement in the stress field of the dislocations, as suggested by Weertman. Since the viscous drag constant at -100 C is about seven orders of magnitude greater than typical room temperature phonon drag constants, the deformation rate is limited by the viscosity, rather than by obstacles as in most materials. No evidence was found for electrical charge on the dislocations, or for a dislocation contribution to the decrement at 500 Hz or 10 MHz. No feature of the present results was inconsistent with the simple model proposed here, and ice is now perhaps one of the best understood plastic materials.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T18:06:36Z No. of bitstreams: 1 1976_joncich.pdf: 2525397 bytes, checksum: 928a2861c27ca2ac9bd1165cb7278b21 (MD5)","Made available in DSpace on 2011-07-05T18:06:36Z (GMT). No. of bitstreams: 1 1976_joncich.pdf: 2525397 bytes, checksum: 928a2861c27ca2ac9bd1165cb7278b21 (MD5) Previous issue date: 1976","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-05T18:06:36Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:39-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["2300983","http://hdl.handle.net/2142/25656"],"dc:language":["en"],"dc:rights":["1976 David Michael Joncich"],"dc:subject":["predeformed ice crystals","plastic behavior","ice crystals","creep","constant strain rate","stress relaxation"],"dc:title":["The plastic behavior of predeformed ice crystals"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}