{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19673"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19673","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Compression mold filling simulation for thick, nonplanar parts","abstract":"A finite element simulation, based on Barone and Caulk's model, is developed to study the compression mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.","abstract_html":"A finite element simulation, based on Barone and Caulk's model, is developed to study the compression mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.","abstract_has_math":false,"creators":["Liang, Erwin Wen-Ti"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Science","degree_department":null,"school":null,"contributors":["Johnson, Robert E."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:14:52Z","date_published":"2011-05-07T12:14:52Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Applied Mechanics","Engineering, Mechanical","Plastics Technology"],"languages":["eng"],"rights":["Copyright 1991 Liang, Erwin Wen-Ti"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124452","(UMI)AAI9124452"],"render_values":[{"text":"AAI9124452","href":null,"code":true},{"text":"(UMI)AAI9124452","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19673","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Johnson, Robert E."]},{"key":"dc:creator","label":"Author","values":["Liang, Erwin Wen-Ti"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:14:52Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Applied Mechanics","Engineering, Mechanical","Plastics Technology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Liang, Erwin Wen-Ti"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124452","(UMI)AAI9124452","http://hdl.handle.net/2142/19673"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["A finite element simulation, based on Barone and Caulk's model, is developed to study the compression mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.","In solving the velocity-pressure type equation, an element-based penalty method is implemented into the simulation. This approach shows great accuracy and efficiency as compared with the mixed formulation and a iteration scheme. The full Barone and Caulk model gives accurate predictions of filling patterns for thick charges. In thin charges, a special numerical treatment of the full Barone and Caulk model is developed by adding artificial elongational viscosity. Finite element results show that this model produces better accuracy in velocity as well as velocity gradient compared with the Hele-Shaw formulation, which is used by most molding simulations.","A new technique is developed for tracking the moving flow front, using a fixed finite element mesh which models the part geometry. For each time step, temporary elements and temporary nodes are generated within the filled region of any element intersected by the flow front. This scheme allows a smooth representation of the flow front and the imposition of exact boundary conditions on the flow front. Other advantages of this scheme are flexibility in mesh generation and the local mesh refinement. This simulation accurately predicts the flow patterns and knit line locations. The formation and motion of knit lines can easily be tracked by this scheme.","A three dimensional shell-like mold cavity is mapped from the physical domain to a planar cavity of uniform thickness in a transformed domain. Two-dimensional flow equations are formulated in the curvilinear coordinate system associated with the mid-surface. The mold filling simulation is performed in the transformed space, as metric tensors and Cristoffel symbols for the surface are provided. The solutions can be mapped back onto the three-dimensional physical space, since all the quantities in the two domains has a one-to-one correspondence.","Made available in DSpace on 2011-05-07T12:14:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124452.pdf: 4932288 bytes, checksum: 75befb9fe29309e5346404c4d0242f94 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:39Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:16:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Compression mold filling simulation for thick, nonplanar parts"]}]}],"canonical_facts":{"dc:contributor":["Johnson, Robert E."],"dc:creator":["Liang, Erwin Wen-Ti"],"dc:date":["2011-05-07T12:14:52Z","10000-01-01","1991"],"dc:description":["A finite element simulation, based on Barone and Caulk's model, is developed to study the compression mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.","In solving the velocity-pressure type equation, an element-based penalty method is implemented into the simulation. This approach shows great accuracy and efficiency as compared with the mixed formulation and a iteration scheme. The full Barone and Caulk model gives accurate predictions of filling patterns for thick charges. In thin charges, a special numerical treatment of the full Barone and Caulk model is developed by adding artificial elongational viscosity. Finite element results show that this model produces better accuracy in velocity as well as velocity gradient compared with the Hele-Shaw formulation, which is used by most molding simulations.","A new technique is developed for tracking the moving flow front, using a fixed finite element mesh which models the part geometry. For each time step, temporary elements and temporary nodes are generated within the filled region of any element intersected by the flow front. This scheme allows a smooth representation of the flow front and the imposition of exact boundary conditions on the flow front. Other advantages of this scheme are flexibility in mesh generation and the local mesh refinement. This simulation accurately predicts the flow patterns and knit line locations. The formation and motion of knit lines can easily be tracked by this scheme.","A three dimensional shell-like mold cavity is mapped from the physical domain to a planar cavity of uniform thickness in a transformed domain. Two-dimensional flow equations are formulated in the curvilinear coordinate system associated with the mid-surface. The mold filling simulation is performed in the transformed space, as metric tensors and Cristoffel symbols for the surface are provided. The solutions can be mapped back onto the three-dimensional physical space, since all the quantities in the two domains has a one-to-one correspondence.","Made available in DSpace on 2011-05-07T12:14:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124452.pdf: 4932288 bytes, checksum: 75befb9fe29309e5346404c4d0242f94 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:39Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:16:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9124452","(UMI)AAI9124452","http://hdl.handle.net/2142/19673"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Liang, Erwin Wen-Ti"],"dc:subject":["Applied Mechanics","Engineering, Mechanical","Plastics Technology"],"dc:title":["Compression mold filling simulation for thick, nonplanar parts"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Science"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:14Z"}