{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/89983"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/89983","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum","abstract":"Stress relief of materials produced in bulk is a key part of the manufacturing process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and opposite nature to balance compressive and tensile stresses existing in the material after solutionizing. The experiment detailed in this work shows the effect of thermal gradients on residual stresses in polymethyl methacrylate (PMMA). A downhill quench from 95 C to 15C is able to create a deflection of 2.36 millimeters, evidence of residual stress. A subsequent uphill quench from -40 to 100 degrees reduced the deflection by 37 percent. The finite element simulation of a 6000 series aluminum block verifies that under properly controlled processing parameters, it is possible to induce opposite stresses to relieve residual stresses in a quenched material. Additional limitations to the uphill quench technique are detailed in the following work so that thermo-mechanical stress relief may be properly applied to a range of materials.","abstract_html":"Stress relief of materials produced in bulk is a key part of the manufacturing process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and opposite nature to balance compressive and tensile stresses existing in the material after solutionizing. The experiment detailed in this work shows the effect of thermal gradients on residual stresses in polymethyl methacrylate (PMMA). A downhill quench from 95 C to 15C is able to create a deflection of 2.36 millimeters, evidence of residual stress. A subsequent uphill quench from -40 to 100 degrees reduced the deflection by 37 percent. The finite element simulation of a 6000 series aluminum block verifies that under properly controlled processing parameters, it is possible to induce opposite stresses to relieve residual stresses in a quenched material. Additional limitations to the uphill quench technique are detailed in the following work so that thermo-mechanical stress relief may be properly applied to a range of materials.","abstract_has_math":false,"creators":["Stephens, Scott, S.B. (Scott A.). Massachusetts Institute of Technology"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Materials Science and Engineering.","school":null,"contributors":[],"advisors":["Thomas W. Eagar."],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014","date_published":"2014","updated_at":"2026-07-22T22:21:23Z","subjects":["Materials Science and Engineering."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/89983","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Thomas W. Eagar."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Materials Science and Engineering."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. Department of Materials Science and Engineering."]},{"key":"dc:creator","label":"Author","values":["Stephens, Scott, S.B. (Scott A.). 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They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/89983"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.","Cataloged from PDF version of thesis.","Includes bibliographical references (page 32)."]},{"key":"dc:description.abstract","label":"Abstract","values":["Stress relief of materials produced in bulk is a key part of the manufacturing process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and opposite nature to balance compressive and tensile stresses existing in the material after solutionizing. The experiment detailed in this work shows the effect of thermal gradients on residual stresses in polymethyl methacrylate (PMMA). A downhill quench from 95 C to 15C is able to create a deflection of 2.36 millimeters, evidence of residual stress. A subsequent uphill quench from -40 to 100 degrees reduced the deflection by 37 percent. The finite element simulation of a 6000 series aluminum block verifies that under properly controlled processing parameters, it is possible to induce opposite stresses to relieve residual stresses in a quenched material. Additional limitations to the uphill quench technique are detailed in the following work so that thermo-mechanical stress relief may be properly applied to a range of materials."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.B."]},{"key":"dc:title","label":"Title","values":["Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum"]}]}],"canonical_facts":{"dc:contributor.advisor":["Thomas W. Eagar."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Materials Science and Engineering."],"dc:contributor.other":["Massachusetts Institute of Technology. Department of Materials Science and Engineering."],"dc:creator":["Stephens, Scott, S.B. (Scott A.). Massachusetts Institute of Technology"],"dc:date.accessioned":["2014-09-19T21:32:34Z"],"dc:date.available":["2014-09-19T21:32:34Z"],"dc:date.issued":["2014"],"dc:description":["Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.","Cataloged from PDF version of thesis.","Includes bibliographical references (page 32)."],"dc:description.abstract":["Stress relief of materials produced in bulk is a key part of the manufacturing process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and opposite nature to balance compressive and tensile stresses existing in the material after solutionizing. The experiment detailed in this work shows the effect of thermal gradients on residual stresses in polymethyl methacrylate (PMMA). A downhill quench from 95 C to 15C is able to create a deflection of 2.36 millimeters, evidence of residual stress. A subsequent uphill quench from -40 to 100 degrees reduced the deflection by 37 percent. The finite element simulation of a 6000 series aluminum block verifies that under properly controlled processing parameters, it is possible to induce opposite stresses to relieve residual stresses in a quenched material. Additional limitations to the uphill quench technique are detailed in the following work so that thermo-mechanical stress relief may be properly applied to a range of materials."],"dc:description.degree":["S.B."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/89983"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Materials Science and Engineering."],"dc:title":["Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:21:23Z"}