{"id":{"repo_id":"colo-mines","oai_identifier":"oai:repository.mines.edu:11124/176403"},"canonical_url":"https://search.dev.ndltd.org/etd/colo-mines/oai:repository.mines.edu:11124/176403","repository":{"repo_id":"colo-mines","name":"Colorado School of Mines","base_url":"https://repository.mines.edu/server/oai/request"},"display":{"title":"Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A","abstract":"This work examines the fracture behavior of additively manufactured (AM) thermosetting resins to enable rapid production of lightweight and functional polymeric and composite materials that can meet a wide range of applications. Specifically, the role of print orientation on the quasi-static and dynamic fracture response of two distinct AM polymer materials, DA-3 and PM-EM828, is presented. While predictive simulations often leverage quasi-static fracture criterion, impulsively loaded cracks can have substantially different resistance to growth. To study dynamic fracture, a unique long-bar apparatus is used to fire a striker at the opposite end of notched and pre-cracked specimens to create a dominantly dynamic Mode-I (opening) load. Digital Image Correlation (DIC) is used in conjunction with ultra-high-speed imaging to capture the evolving displacement fields ahead of the crack tip. The elastodynamic solution for a stationary crack is optimized using a least square fit to extract the evolving critical stress intensity factor (SIF) leading to fracture initiation. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Findings suggest that the print orientation does slightly affect the quasi-static and dynamic fracture response of DA-3, however the PM-EM828 does not show statistically significant orientation dependencies on fracture behavior. The DA-3 exhibited between 46% to 60% higher quasi-static fracture toughness values than dynamic, on average, but the trends mirrored the printed orientation dependency of dynamic loading. Conversely, PM-EM828 exhibited approximately 20% lower quasi-static fracture values than dynamic values and had little to no orientation dependency. The overall toughness of the PM-EM828 layers are on a similar level to their interlayer adhesion zones, suggesting why there may be little print orientation dependence. Conversely, the DA-3 layers are less brittle than their interlayer adhesion zones, and so the orientation of the adhesion zones with respect to the print orientation seems to allow for a greater resistance to fracture.","abstract_html":"This work examines the fracture behavior of additively manufactured (AM) thermosetting resins to enable rapid production of lightweight and functional polymeric and composite materials that can meet a wide range of applications. Specifically, the role of print orientation on the quasi-static and dynamic fracture response of two distinct AM polymer materials, DA-3 and PM-EM828, is presented. While predictive simulations often leverage quasi-static fracture criterion, impulsively loaded cracks can have substantially different resistance to growth. To study dynamic fracture, a unique long-bar apparatus is used to fire a striker at the opposite end of notched and pre-cracked specimens to create a dominantly dynamic Mode-I (opening) load. Digital Image Correlation (DIC) is used in conjunction with ultra-high-speed imaging to capture the evolving displacement fields ahead of the crack tip. The elastodynamic solution for a stationary crack is optimized using a least square fit to extract the evolving critical stress intensity factor (SIF) leading to fracture initiation. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Findings suggest that the print orientation does slightly affect the quasi-static and dynamic fracture response of DA-3, however the PM-EM828 does not show statistically significant orientation dependencies on fracture behavior. The DA-3 exhibited between 46% to 60% higher quasi-static fracture toughness values than dynamic, on average, but the trends mirrored the printed orientation dependency of dynamic loading. Conversely, PM-EM828 exhibited approximately 20% lower quasi-static fracture values than dynamic values and had little to no orientation dependency. The overall toughness of the PM-EM828 layers are on a similar level to their interlayer adhesion zones, suggesting why there may be little print orientation dependence. Conversely, the DA-3 layers are less brittle than their interlayer adhesion zones, and so the orientation of the adhesion zones with respect to the print orientation seems to allow for a greater resistance to fracture.","abstract_has_math":false,"creators":["Brunstad, Nicholas John"],"institution":"Colorado School of Mines. Arthur Lakes Library","degree_name":"Master of Science (M.S.)","degree_level":"Masters","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Lamberson, Leslie"],"committee_chairs":[],"committee_members":["Berger, John R.","Eliasson, Veronica","Koumlis, Stylianos"],"year":2021,"date_issued":"2021","date_published":"2021","updated_at":"2026-07-24T01:44:05Z","subjects":["digital light processing","fracture mechanics","quasi-static fracture","dynamic fracture","additive manufacturing","print orientation"],"languages":["eng","English"],"rights":["Copyright of the original work is retained by the author."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["T 9090"],"render_values":[{"text":"T 9090","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/11124/176403","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Lamberson, Leslie"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Berger, John R.","Eliasson, Veronica","Koumlis, Stylianos"]},{"key":"dc:creator","label":"Author","values":["Brunstad, Nicholas John"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2021-06-28T10:13:39Z","2022-02-03T13:24:30Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2021-06-28T10:13:39Z","2022-02-03T13:24:30Z"]},{"key":"dc:date.issued","label":"Date","values":["2021"]},{"key":"dc:publisher","label":"Institution","values":["Colorado School of Mines. Arthur Lakes Library"]},{"key":"dc:type","label":"Dc Type","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (M.S.)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Colorado School of Mines"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["digital light processing","fracture mechanics","quasi-static fracture","dynamic fracture","additive manufacturing","print orientation"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright of the original work is retained by the author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["Brunstad_mines_0052N_12122.pdf","T 9090"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/11124/176403"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Includes bibliographical references.","2021 Spring."]},{"key":"dc:description.abstract","label":"Abstract","values":["This work examines the fracture behavior of additively manufactured (AM) thermosetting resins to enable rapid production of lightweight and functional polymeric and composite materials that can meet a wide range of applications. Specifically, the role of print orientation on the quasi-static and dynamic fracture response of two distinct AM polymer materials, DA-3 and PM-EM828, is presented. While predictive simulations often leverage quasi-static fracture criterion, impulsively loaded cracks can have substantially different resistance to growth. To study dynamic fracture, a unique long-bar apparatus is used to fire a striker at the opposite end of notched and pre-cracked specimens to create a dominantly dynamic Mode-I (opening) load. Digital Image Correlation (DIC) is used in conjunction with ultra-high-speed imaging to capture the evolving displacement fields ahead of the crack tip. The elastodynamic solution for a stationary crack is optimized using a least square fit to extract the evolving critical stress intensity factor (SIF) leading to fracture initiation. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Findings suggest that the print orientation does slightly affect the quasi-static and dynamic fracture response of DA-3, however the PM-EM828 does not show statistically significant orientation dependencies on fracture behavior. The DA-3 exhibited between 46% to 60% higher quasi-static fracture toughness values than dynamic, on average, but the trends mirrored the printed orientation dependency of dynamic loading. Conversely, PM-EM828 exhibited approximately 20% lower quasi-static fracture values than dynamic values and had little to no orientation dependency. The overall toughness of the PM-EM828 layers are on a similar level to their interlayer adhesion zones, suggesting why there may be little print orientation dependence. Conversely, the DA-3 layers are less brittle than their interlayer adhesion zones, and so the orientation of the adhesion zones with respect to the print orientation seems to allow for a greater resistance to fracture."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["born digital","masters theses"]},{"key":"dc:title","label":"Title","values":["Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A"]}]}],"canonical_facts":{"dc:contributor.advisor":["Lamberson, Leslie"],"dc:contributor.committeemember":["Berger, John R.","Eliasson, Veronica","Koumlis, Stylianos"],"dc:creator":["Brunstad, Nicholas John"],"dc:date.accessioned":["2021-06-28T10:13:39Z","2022-02-03T13:24:30Z"],"dc:date.available":["2021-06-28T10:13:39Z","2022-02-03T13:24:30Z"],"dc:date.issued":["2021"],"dc:description":["Includes bibliographical references.","2021 Spring."],"dc:description.abstract":["This work examines the fracture behavior of additively manufactured (AM) thermosetting resins to enable rapid production of lightweight and functional polymeric and composite materials that can meet a wide range of applications. Specifically, the role of print orientation on the quasi-static and dynamic fracture response of two distinct AM polymer materials, DA-3 and PM-EM828, is presented. While predictive simulations often leverage quasi-static fracture criterion, impulsively loaded cracks can have substantially different resistance to growth. To study dynamic fracture, a unique long-bar apparatus is used to fire a striker at the opposite end of notched and pre-cracked specimens to create a dominantly dynamic Mode-I (opening) load. Digital Image Correlation (DIC) is used in conjunction with ultra-high-speed imaging to capture the evolving displacement fields ahead of the crack tip. The elastodynamic solution for a stationary crack is optimized using a least square fit to extract the evolving critical stress intensity factor (SIF) leading to fracture initiation. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Findings suggest that the print orientation does slightly affect the quasi-static and dynamic fracture response of DA-3, however the PM-EM828 does not show statistically significant orientation dependencies on fracture behavior. The DA-3 exhibited between 46% to 60% higher quasi-static fracture toughness values than dynamic, on average, but the trends mirrored the printed orientation dependency of dynamic loading. Conversely, PM-EM828 exhibited approximately 20% lower quasi-static fracture values than dynamic values and had little to no orientation dependency. The overall toughness of the PM-EM828 layers are on a similar level to their interlayer adhesion zones, suggesting why there may be little print orientation dependence. Conversely, the DA-3 layers are less brittle than their interlayer adhesion zones, and so the orientation of the adhesion zones with respect to the print orientation seems to allow for a greater resistance to fracture."],"dc:format.medium":["born digital","masters theses"],"dc:identifier":["Brunstad_mines_0052N_12122.pdf","T 9090"],"dc:identifier.uri":["https://hdl.handle.net/11124/176403"],"dc:language":["English"],"dc:language.iso":["eng"],"dc:publisher":["Colorado School of Mines. Arthur Lakes Library"],"dc:rights":["Copyright of the original work is retained by the author."],"dc:subject":["digital light processing","fracture mechanics","quasi-static fracture","dynamic fracture","additive manufacturing","print orientation"],"dc:title":["Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A"],"dc:type":["Text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science (M.S.)"],"thesis:institution_name":["Colorado School of Mines"]},"updated_at":"2026-07-24T01:44:05Z"}