{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/121410"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/121410","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Experiments of the natural fragmentation of explosively-driven metal hemispheres at the 100-gram scale","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms","abstract_has_math":false,"creators":["Spradling, Austin Lake"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Glumac, Nick G","Elliott, Gregory S"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-08","date_published":"2023-08","updated_at":"2026-07-22T22:24:57Z","subjects":["Natural Fragmentation","Metal Hemisphere","High Explosive","Cased Charge","Tantalum","Gallium","Indium","Experimental"],"languages":["en","eng"],"rights":["Copyright 2023 Austin Lake Spradling"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/121410","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Glumac, Nick G","Elliott, Gregory S"]},{"key":"dc:creator","label":"Author","values":["Spradling, Austin Lake"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-08","2023-07-21"]},{"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":["Natural Fragmentation","Metal Hemisphere","High Explosive","Cased Charge","Tantalum","Gallium","Indium","Experimental"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Austin Lake Spradling"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/121410"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms","The student, Austin Lake Spradling, accepted the attached license on 2023-06-06 at 12:57.","The student, Austin Lake Spradling, submitted this Thesis for approval on 2023-06-06 at 13:16.","This Thesis was approved for publication on 2023-07-21 at 17:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19407 on 2023-12-04 at 16:59:52","To study the problem of natural fragmentation of hemispherical high-explosive metal casings, six exploratory experiments were performed at the 100-gram scale using gallium, indium, and tantalum shells with 1:1 and 2:1 explosive-to-shell mass ratios. For each test, soft catch devices were used to capture shell fragments in flight, and other post-test particulates were collected, sieved, and elementally analyzed. For gallium and indium shells, post-test particulate analyses indicate near complete, if not total, conversion to oxide. Preliminary tantalum results suggest that soft catch, particularly ballistic gelatin, along with particle analysis techniques X-ray fluorescence and X-ray diffraction are likely to be useful tools for quantifying its fragment size distribution in flight. Three new optical diagnostics - ratio pyrometry, flash radiography, and high-speed videography - have recently been implemented and show promising results for both qualitative understanding and quantitative measurement of the fragmentation process at early times. Additionally, a technique was developed for press forming a unique shell shape and mounting it in a way that better approximates a spherical system."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Experiments of the natural fragmentation of explosively-driven metal hemispheres at the 100-gram scale"]}]}],"canonical_facts":{"dc:contributor":["Glumac, Nick G","Elliott, Gregory S"],"dc:creator":["Spradling, Austin Lake"],"dc:date":["2023-08","2023-07-21"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms","The student, Austin Lake Spradling, accepted the attached license on 2023-06-06 at 12:57.","The student, Austin Lake Spradling, submitted this Thesis for approval on 2023-06-06 at 13:16.","This Thesis was approved for publication on 2023-07-21 at 17:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19407 on 2023-12-04 at 16:59:52","To study the problem of natural fragmentation of hemispherical high-explosive metal casings, six exploratory experiments were performed at the 100-gram scale using gallium, indium, and tantalum shells with 1:1 and 2:1 explosive-to-shell mass ratios. For each test, soft catch devices were used to capture shell fragments in flight, and other post-test particulates were collected, sieved, and elementally analyzed. For gallium and indium shells, post-test particulate analyses indicate near complete, if not total, conversion to oxide. Preliminary tantalum results suggest that soft catch, particularly ballistic gelatin, along with particle analysis techniques X-ray fluorescence and X-ray diffraction are likely to be useful tools for quantifying its fragment size distribution in flight. Three new optical diagnostics - ratio pyrometry, flash radiography, and high-speed videography - have recently been implemented and show promising results for both qualitative understanding and quantitative measurement of the fragmentation process at early times. Additionally, a technique was developed for press forming a unique shell shape and mounting it in a way that better approximates a spherical system."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/121410"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Austin Lake Spradling"],"dc:subject":["Natural Fragmentation","Metal Hemisphere","High Explosive","Cased Charge","Tantalum","Gallium","Indium","Experimental"],"dc:title":["Experiments of the natural fragmentation of explosively-driven metal hemispheres at the 100-gram scale"],"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":"2026-07-22T22:24:57Z"}