{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78705"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78705","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Enhancing reactivity of aluminum-based structural energetic materials","abstract":"Reactive metals are routinely added in applications such as propellants and explosives to increase energy density and total energy output. These materials are also becoming useful in warhead casings compared to traditional inert materials because of their ability to enhance weapon output such as peak blast pressure and blast impulse. Aluminum is a good candidate for such enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic potential stored within the material. In addition, aluminum casings are capable of producing large fragments (on the order of mm's) which can be diffi cult to ignite and are accelerated away from the target, lending no additional reaction enhancement to the initial blast. This study aims to determine the most e ffective methods of increasing the reactivity of aluminum warhead casings through modi fication of alloy composition and casing geometry using controlled explosive initiation experiments. The study also explores e ffects of explosive end confi nement and impact induced fragment reactions. Transient and quasi-static pressure measurements, high speed imaging, and spatially-varying spectroscopy are performed to determine the e ffectiveness of reaction enhancement for each alloy. In addition, analysis of coarse and fine fragments collected during experiments provides insight into the role of fragmentation size and distribution on reactivity enhancement of the aluminum materials. Generation of fi ne particles below 10 microns during initial fragmentation is believed to play a key role in the casing reactivity enhancement immediately following the high explosive detonation.","abstract_html":"Reactive metals are routinely added in applications such as propellants and explosives to increase energy density and total energy output. These materials are also becoming useful in warhead casings compared to traditional inert materials because of their ability to enhance weapon output such as peak blast pressure and blast impulse. Aluminum is a good candidate for such enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic potential stored within the material. In addition, aluminum casings are capable of producing large fragments (on the order of mm's) which can be diffi cult to ignite and are accelerated away from the target, lending no additional reaction enhancement to the initial blast. This study aims to determine the most e ffective methods of increasing the reactivity of aluminum warhead casings through modi fication of alloy composition and casing geometry using controlled explosive initiation experiments. The study also explores e ffects of explosive end confi nement and impact induced fragment reactions. Transient and quasi-static pressure measurements, high speed imaging, and spatially-varying spectroscopy are performed to determine the e ffectiveness of reaction enhancement for each alloy. In addition, analysis of coarse and fine fragments collected during experiments provides insight into the role of fragmentation size and distribution on reactivity enhancement of the aluminum materials. Generation of fi ne particles below 10 microns during initial fragmentation is believed to play a key role in the casing reactivity enhancement immediately following the high explosive detonation.","abstract_has_math":false,"creators":["Clemenson, Michael"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Glumac, Nick G.","Krier, Herman","Stewart, Donald S.","Lambros, John"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:44:54Z","date_published":"2015-07-22T22:44:54Z","updated_at":"2026-07-22T22:26:12Z","subjects":["Casing","Detonation","Structural Energetic Materials","Combustion","Aluminum"],"languages":[],"rights":["Copyright 2015 Michael D. 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Clemenson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78705"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Reactive metals are routinely added in applications such as propellants and explosives to increase energy density and total energy output. These materials are also becoming useful in warhead casings compared to traditional inert materials because of their ability to enhance weapon output such as peak blast pressure and blast impulse. Aluminum is a good candidate for such enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic potential stored within the material. In addition, aluminum casings are capable of producing large fragments (on the order of mm's) which can be diffi cult to ignite and are accelerated away from the target, lending no additional reaction enhancement to the initial blast. This study aims to determine the most e ffective methods of increasing the reactivity of aluminum warhead casings through modi fication of alloy composition and casing geometry using controlled explosive initiation experiments. The study also explores e ffects of explosive end confi nement and impact induced fragment reactions. Transient and quasi-static pressure measurements, high speed imaging, and spatially-varying spectroscopy are performed to determine the e ffectiveness of reaction enhancement for each alloy. In addition, analysis of coarse and fine fragments collected during experiments provides insight into the role of fragmentation size and distribution on reactivity enhancement of the aluminum materials. Generation of fi ne particles below 10 microns during initial fragmentation is believed to play a key role in the casing reactivity enhancement immediately following the high explosive detonation.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01","The student, Michael Clemenson, accepted the attached license on 2015-01-13 at 14:53.","The student, Michael Clemenson, submitted this Dissertation for approval on 2015-01-14 at 10:08.","This Dissertation was approved for publication on 2015-01-20 at 11:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7679 on 2015-07-22 at 14:23:38","Made available in DSpace on 2015-07-22T22:44:54Z (GMT). No. of bitstreams: 2 Clemenson_Michael1.pdf: 136615581 bytes, checksum: 5c59cc4ad90fb36220a2ec0490eba24d (MD5) license.txt: 4067 bytes, checksum: b418d9c6937dbe64bb81536f0bddcdb4 (MD5) Previous issue date: 2015-01-20","Embargo set by: Seth Robbins for item 79946 Lift date: 2017-07-22T22:46:21Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 79946 on 2017-07-23T09:15:24Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Enhancing reactivity of aluminum-based structural energetic materials"]}]}],"canonical_facts":{"dc:contributor":["Glumac, Nick G.","Krier, Herman","Stewart, Donald S.","Lambros, John"],"dc:creator":["Clemenson, Michael"],"dc:date":["2015-07-22T22:44:54Z","2017-07-23T09:15:24Z","2015-05","2015-01-20","2015-5"],"dc:description":["Reactive metals are routinely added in applications such as propellants and explosives to increase energy density and total energy output. These materials are also becoming useful in warhead casings compared to traditional inert materials because of their ability to enhance weapon output such as peak blast pressure and blast impulse. Aluminum is a good candidate for such enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic potential stored within the material. In addition, aluminum casings are capable of producing large fragments (on the order of mm's) which can be diffi cult to ignite and are accelerated away from the target, lending no additional reaction enhancement to the initial blast. This study aims to determine the most e ffective methods of increasing the reactivity of aluminum warhead casings through modi fication of alloy composition and casing geometry using controlled explosive initiation experiments. The study also explores e ffects of explosive end confi nement and impact induced fragment reactions. Transient and quasi-static pressure measurements, high speed imaging, and spatially-varying spectroscopy are performed to determine the e ffectiveness of reaction enhancement for each alloy. In addition, analysis of coarse and fine fragments collected during experiments provides insight into the role of fragmentation size and distribution on reactivity enhancement of the aluminum materials. Generation of fi ne particles below 10 microns during initial fragmentation is believed to play a key role in the casing reactivity enhancement immediately following the high explosive detonation.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01","The student, Michael Clemenson, accepted the attached license on 2015-01-13 at 14:53.","The student, Michael Clemenson, submitted this Dissertation for approval on 2015-01-14 at 10:08.","This Dissertation was approved for publication on 2015-01-20 at 11:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #7679 on 2015-07-22 at 14:23:38","Made available in DSpace on 2015-07-22T22:44:54Z (GMT). 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