{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101206"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101206","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Partial dislocations interactions with symmetrical-tilt grain boundaries containing e-structural units: Local stress analysis with molecular dynamics","abstract":"This Thesis was approved for publication on 2018-04-24 at 12:25.","abstract_html":"This Thesis was approved for publication on 2018-04-24 at 12:25.","abstract_has_math":false,"creators":["Mohan, Sivasakthya"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Chew, Huck Beng"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-04T20:36:50Z","date_published":"2018-09-04T20:36:50Z","updated_at":"2026-07-22T22:24:38Z","subjects":["Structural unit model","dislocation interaction","grain boundary","local stress fields","molecular dynamics simulations"],"languages":["en"],"rights":["Copyright 2018 Sivasakthya Mohan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101206","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chew, Huck Beng"]},{"key":"dc:creator","label":"Author","values":["Mohan, Sivasakthya"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-04T20:36:50Z","2020-09-05T09:15:17Z","2018-04-24","2018-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Structural unit model","dislocation interaction","grain boundary","local stress fields","molecular dynamics simulations"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Sivasakthya Mohan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101206"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This Thesis was approved for publication on 2018-04-24 at 12:25.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12413 on 2018-08-31 at 17:21:10","Made available in DSpace on 2018-09-04T20:36:50Z (GMT). No. of bitstreams: 2 MOHAN-THESIS-2018.pdf: 3730776 bytes, checksum: 2117f84a15ed4ee6d6201d558fa1c33d (MD5) LICENSE.txt: 4214 bytes, checksum: 7b7c68a1d14b2781471efb8dd2614a03 (MD5) Previous issue date: 2018-04-24","Embargo set by: Seth Robbins for item 107290 Lift date: 2020-09-04T20:37:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Grain boundaries containing porous E-structural units (SUs) are known to readily emit dislocations under tension. This work establishes a correlation between the atomic structure, evolution of interfacial stresses and slip transfer mechanisms at grain boundaries containing E-structural units. Using molecular dynamics simulations, we study the interactions between <112>{111} Shockley partial dislocations and <110> symmetrical-tilt Ni grain boundaries containing E-SUs. We show that the incoming Shockley partials can be accommodated by porous E-SUs along the grain boundary. However, the partial-absorption process disrupts the short-range interactions of incipient dislocations along the boundary, which generates high local tensile and compressive stress regimes emanating from the impingement site. For the favored Σ9(221) grain boundary comprising only of E-SUs, Shockley partials originating from E-SUs located within the tensile stress regime are subsequently re-emitted into the neighboring grain. We demonstrate that the critical strength for re-emission of Shockley partials can be delineated into contributions from tensile stress generated by partial-absorption, intrinsic grain boundary tractions, as well as external loading. In the presence of other types of SUs, the incoming Shockley partial can also be transmitted through the boundary or be stably absorbed by the boundary with no subsequent re-emission, depending on the impingement site.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Sivasakthya Mohan, accepted the attached license on 2018-04-23 at 12:14.","The student, Sivasakthya Mohan, submitted this Thesis for approval on 2018-04-23 at 12:19.","Embargo set by: Seth Robbins for item 107290 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107290 on 2020-09-05T09:15:17Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Partial dislocations interactions with symmetrical-tilt grain boundaries containing e-structural units: Local stress analysis with molecular dynamics"]}]}],"canonical_facts":{"dc:contributor":["Chew, Huck Beng"],"dc:creator":["Mohan, Sivasakthya"],"dc:date":["2018-09-04T20:36:50Z","2020-09-05T09:15:17Z","2018-04-24","2018-05"],"dc:description":["This Thesis was approved for publication on 2018-04-24 at 12:25.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12413 on 2018-08-31 at 17:21:10","Made available in DSpace on 2018-09-04T20:36:50Z (GMT). No. of bitstreams: 2 MOHAN-THESIS-2018.pdf: 3730776 bytes, checksum: 2117f84a15ed4ee6d6201d558fa1c33d (MD5) LICENSE.txt: 4214 bytes, checksum: 7b7c68a1d14b2781471efb8dd2614a03 (MD5) Previous issue date: 2018-04-24","Embargo set by: Seth Robbins for item 107290 Lift date: 2020-09-04T20:37:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Grain boundaries containing porous E-structural units (SUs) are known to readily emit dislocations under tension. This work establishes a correlation between the atomic structure, evolution of interfacial stresses and slip transfer mechanisms at grain boundaries containing E-structural units. Using molecular dynamics simulations, we study the interactions between <112>{111} Shockley partial dislocations and <110> symmetrical-tilt Ni grain boundaries containing E-SUs. We show that the incoming Shockley partials can be accommodated by porous E-SUs along the grain boundary. However, the partial-absorption process disrupts the short-range interactions of incipient dislocations along the boundary, which generates high local tensile and compressive stress regimes emanating from the impingement site. For the favored Σ9(221) grain boundary comprising only of E-SUs, Shockley partials originating from E-SUs located within the tensile stress regime are subsequently re-emitted into the neighboring grain. We demonstrate that the critical strength for re-emission of Shockley partials can be delineated into contributions from tensile stress generated by partial-absorption, intrinsic grain boundary tractions, as well as external loading. In the presence of other types of SUs, the incoming Shockley partial can also be transmitted through the boundary or be stably absorbed by the boundary with no subsequent re-emission, depending on the impingement site.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Sivasakthya Mohan, accepted the attached license on 2018-04-23 at 12:14.","The student, Sivasakthya Mohan, submitted this Thesis for approval on 2018-04-23 at 12:19.","Embargo set by: Seth Robbins for item 107290 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107290 on 2020-09-05T09:15:17Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101206"],"dc:language":["en"],"dc:rights":["Copyright 2018 Sivasakthya Mohan"],"dc:subject":["Structural unit model","dislocation interaction","grain boundary","local stress fields","molecular dynamics simulations"],"dc:title":["Partial dislocations interactions with symmetrical-tilt grain boundaries containing e-structural units: Local stress analysis with molecular dynamics"],"dc:type":["text"],"thesis:degree_discipline":["Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:38Z"}