{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/113060"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/113060","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Theory and modeling of laser-driven flyer plate experiments to study explosives under a microscope","abstract":"Studying liquid and solid high-explosive materials requires precise characterization of thermodynamics and chemical kinetics to capture the reactive behavior. Although high explosives have been studied for many decades, there is currently no reactive continuum scale model for characterizing reactive materials in the micrometer length scale and nanosecond time-scale. The Dlott research group at the University of Illinois Urbana-Champaign has developed a novel, tabletop experimental set-up, which has provided high-quality experimental data. In the research described herein, we (1) present a computational framework for modeling and simulating microscopic size, laser-driven flyer impact experiments at 0.5 – 4.5 km/s, (2) identify and develop effective material models for inert and reactive materials, and (3) utilize this framework to present deeper understanding of reactive behavior for a classical reactive material, liquid nitromethane. We present a computational approach using a multi-material, arbitrary Lagrangian-Eulerian code termed ALE3D to model the nanosecond/micrometer dynamics of the launch of 0.5 - 4.5 km/s laser-driven metal flyer plates and the impact with stationary targets of Pyrex and fused silica glasses, and Lexan and Plexiglas polymers, producing pressures in the target in the 5 - 20 GPa range. The simulations are compared to experimental results where the flyer velocity profile and the velocity profile imparted to the target material were measured with high-speed velocimetry. The experimental flyer launch by a high-intensity pulsed laser is modeled by depositing heat into a thin vaporizable layer under the flyer plate. This model produces a flyer plate that has not been exposed to the laser pulse, allowing us to compare the properties of the real flyer to a simulated ideal flyer. Simulations of target impact are in good agreement with experiment except at the highest impact velocities where the shock release process in experiment is slower than in the simulation. In addition, we observe the spallation influence in the metal flyer at these hyper-velocity speeds. We utilize the same computational framework with the multi-physics ALE3D code to model the nanosecond/micrometer dynamics of the 1.60 – 4.30 km/s laser-driven flyer plate and the impact with stationary target containing pure, liquid nitromethane, sandwiched between a metal lid and a transparent Pyrex window. Basically, in this specific case, we extend the inert example above by incorporating a reactive material target to be studied. Shock compressed, nitromethane chemical reactivity is modeled using the CHEETAH, thermochemical code within ALE3D. The reactive model parameters are obtained from past studies in literature, and assessed to capture the reactivity in liquid nitromethane within the experimental time duration. Simulation results show good agreement when compared to experimental data for the incoming PDV velocity profiles and the downstream comparison of velocity profiles at 25 μm, 40 μm, 64 μm, 90 μm, and 170 μm downstream. We also present pressure, density, and temperature results. As part of this research, we developed a novel framework for studying reactive materials at the microscopic scale with fast-time chemical kinetics. We show careful characterization of the inert material behavior at high impact, as well as, the material behavior under shock compressive reactive behavior. This framework can be utilized to studying other liquid and solid materials to further understand the reactive dynamics at the point where physics and chemistry merge together.","abstract_html":"Studying liquid and solid high-explosive materials requires precise characterization of thermodynamics and chemical kinetics to capture the reactive behavior. Although high explosives have been studied for many decades, there is currently no reactive continuum scale model for characterizing reactive materials in the micrometer length scale and nanosecond time-scale. The Dlott research group at the University of Illinois Urbana-Champaign has developed a novel, tabletop experimental set-up, which has provided high-quality experimental data. In the research described herein, we (1) present a computational framework for modeling and simulating microscopic size, laser-driven flyer impact experiments at 0.5 – 4.5 km/s, (2) identify and develop effective material models for inert and reactive materials, and (3) utilize this framework to present deeper understanding of reactive behavior for a classical reactive material, liquid nitromethane. We present a computational approach using a multi-material, arbitrary Lagrangian-Eulerian code termed ALE3D to model the nanosecond/micrometer dynamics of the launch of 0.5 - 4.5 km/s laser-driven metal flyer plates and the impact with stationary targets of Pyrex and fused silica glasses, and Lexan and Plexiglas polymers, producing pressures in the target in the 5 - 20 GPa range. The simulations are compared to experimental results where the flyer velocity profile and the velocity profile imparted to the target material were measured with high-speed velocimetry. The experimental flyer launch by a high-intensity pulsed laser is modeled by depositing heat into a thin vaporizable layer under the flyer plate. This model produces a flyer plate that has not been exposed to the laser pulse, allowing us to compare the properties of the real flyer to a simulated ideal flyer. Simulations of target impact are in good agreement with experiment except at the highest impact velocities where the shock release process in experiment is slower than in the simulation. In addition, we observe the spallation influence in the metal flyer at these hyper-velocity speeds. We utilize the same computational framework with the multi-physics ALE3D code to model the nanosecond/micrometer dynamics of the 1.60 – 4.30 km/s laser-driven flyer plate and the impact with stationary target containing pure, liquid nitromethane, sandwiched between a metal lid and a transparent Pyrex window. Basically, in this specific case, we extend the inert example above by incorporating a reactive material target to be studied. Shock compressed, nitromethane chemical reactivity is modeled using the CHEETAH, thermochemical code within ALE3D. The reactive model parameters are obtained from past studies in literature, and assessed to capture the reactivity in liquid nitromethane within the experimental time duration. Simulation results show good agreement when compared to experimental data for the incoming PDV velocity profiles and the downstream comparison of velocity profiles at 25 μm, 40 μm, 64 μm, 90 μm, and 170 μm downstream. We also present pressure, density, and temperature results. As part of this research, we developed a novel framework for studying reactive materials at the microscopic scale with fast-time chemical kinetics. We show careful characterization of the inert material behavior at high impact, as well as, the material behavior under shock compressive reactive behavior. This framework can be utilized to studying other liquid and solid materials to further understand the reactive dynamics at the point where physics and chemistry merge together.","abstract_has_math":false,"creators":["Stekovic, Svjetlana"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Theoretical & Applied Mechans","degree_department":null,"school":null,"contributors":["Stewart, Donald Scott","Dlott, Dana D","Springer, Harry Keo","Glumac, Nick","Krier, Herman"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-01-12T21:46:51Z","date_published":"2022-01-12T21:46:51Z","updated_at":"2026-07-22T22:24:53Z","subjects":["explosives","laser-driven flyer impact","nitromethane","shock compression","chemical kinetics","fluid mechanics"],"languages":["en"],"rights":["Copyright 2021 Svjetlana Stekovic"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/113060","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stewart, Donald Scott","Dlott, Dana D","Springer, Harry Keo","Glumac, Nick","Krier, Herman"]},{"key":"dc:creator","label":"Author","values":["Stekovic, Svjetlana"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-01-12T21:46:51Z","2021-07-16","2021-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Theoretical & Applied Mechans"]},{"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":["explosives","laser-driven flyer impact","nitromethane","shock compression","chemical kinetics","fluid mechanics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2021 Svjetlana Stekovic"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/113060"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Studying liquid and solid high-explosive materials requires precise characterization of thermodynamics and chemical kinetics to capture the reactive behavior. Although high explosives have been studied for many decades, there is currently no reactive continuum scale model for characterizing reactive materials in the micrometer length scale and nanosecond time-scale. The Dlott research group at the University of Illinois Urbana-Champaign has developed a novel, tabletop experimental set-up, which has provided high-quality experimental data. In the research described herein, we (1) present a computational framework for modeling and simulating microscopic size, laser-driven flyer impact experiments at 0.5 – 4.5 km/s, (2) identify and develop effective material models for inert and reactive materials, and (3) utilize this framework to present deeper understanding of reactive behavior for a classical reactive material, liquid nitromethane. We present a computational approach using a multi-material, arbitrary Lagrangian-Eulerian code termed ALE3D to model the nanosecond/micrometer dynamics of the launch of 0.5 - 4.5 km/s laser-driven metal flyer plates and the impact with stationary targets of Pyrex and fused silica glasses, and Lexan and Plexiglas polymers, producing pressures in the target in the 5 - 20 GPa range. The simulations are compared to experimental results where the flyer velocity profile and the velocity profile imparted to the target material were measured with high-speed velocimetry. The experimental flyer launch by a high-intensity pulsed laser is modeled by depositing heat into a thin vaporizable layer under the flyer plate. This model produces a flyer plate that has not been exposed to the laser pulse, allowing us to compare the properties of the real flyer to a simulated ideal flyer. Simulations of target impact are in good agreement with experiment except at the highest impact velocities where the shock release process in experiment is slower than in the simulation. In addition, we observe the spallation influence in the metal flyer at these hyper-velocity speeds. We utilize the same computational framework with the multi-physics ALE3D code to model the nanosecond/micrometer dynamics of the 1.60 – 4.30 km/s laser-driven flyer plate and the impact with stationary target containing pure, liquid nitromethane, sandwiched between a metal lid and a transparent Pyrex window. Basically, in this specific case, we extend the inert example above by incorporating a reactive material target to be studied. Shock compressed, nitromethane chemical reactivity is modeled using the CHEETAH, thermochemical code within ALE3D. The reactive model parameters are obtained from past studies in literature, and assessed to capture the reactivity in liquid nitromethane within the experimental time duration. Simulation results show good agreement when compared to experimental data for the incoming PDV velocity profiles and the downstream comparison of velocity profiles at 25 μm, 40 μm, 64 μm, 90 μm, and 170 μm downstream. We also present pressure, density, and temperature results. As part of this research, we developed a novel framework for studying reactive materials at the microscopic scale with fast-time chemical kinetics. We show careful characterization of the inert material behavior at high impact, as well as, the material behavior under shock compressive reactive behavior. This framework can be utilized to studying other liquid and solid materials to further understand the reactive dynamics at the point where physics and chemistry merge together.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-01-12 without embargo terms","The student, Svjetlana Stekovic, accepted the attached license on 2021-07-15 at 22:10.","The student, Svjetlana Stekovic, submitted this Dissertation for approval on 2021-07-15 at 22:20.","This Dissertation was approved for publication on 2021-07-16 at 15:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #16976 on 2022-01-12 at 12:45:59","Made available in DSpace on 2022-01-12T21:46:51Z (GMT). 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Although high explosives have been studied for many decades, there is currently no reactive continuum scale model for characterizing reactive materials in the micrometer length scale and nanosecond time-scale. The Dlott research group at the University of Illinois Urbana-Champaign has developed a novel, tabletop experimental set-up, which has provided high-quality experimental data. In the research described herein, we (1) present a computational framework for modeling and simulating microscopic size, laser-driven flyer impact experiments at 0.5 – 4.5 km/s, (2) identify and develop effective material models for inert and reactive materials, and (3) utilize this framework to present deeper understanding of reactive behavior for a classical reactive material, liquid nitromethane. We present a computational approach using a multi-material, arbitrary Lagrangian-Eulerian code termed ALE3D to model the nanosecond/micrometer dynamics of the launch of 0.5 - 4.5 km/s laser-driven metal flyer plates and the impact with stationary targets of Pyrex and fused silica glasses, and Lexan and Plexiglas polymers, producing pressures in the target in the 5 - 20 GPa range. The simulations are compared to experimental results where the flyer velocity profile and the velocity profile imparted to the target material were measured with high-speed velocimetry. The experimental flyer launch by a high-intensity pulsed laser is modeled by depositing heat into a thin vaporizable layer under the flyer plate. This model produces a flyer plate that has not been exposed to the laser pulse, allowing us to compare the properties of the real flyer to a simulated ideal flyer. Simulations of target impact are in good agreement with experiment except at the highest impact velocities where the shock release process in experiment is slower than in the simulation. In addition, we observe the spallation influence in the metal flyer at these hyper-velocity speeds. We utilize the same computational framework with the multi-physics ALE3D code to model the nanosecond/micrometer dynamics of the 1.60 – 4.30 km/s laser-driven flyer plate and the impact with stationary target containing pure, liquid nitromethane, sandwiched between a metal lid and a transparent Pyrex window. Basically, in this specific case, we extend the inert example above by incorporating a reactive material target to be studied. Shock compressed, nitromethane chemical reactivity is modeled using the CHEETAH, thermochemical code within ALE3D. The reactive model parameters are obtained from past studies in literature, and assessed to capture the reactivity in liquid nitromethane within the experimental time duration. Simulation results show good agreement when compared to experimental data for the incoming PDV velocity profiles and the downstream comparison of velocity profiles at 25 μm, 40 μm, 64 μm, 90 μm, and 170 μm downstream. We also present pressure, density, and temperature results. As part of this research, we developed a novel framework for studying reactive materials at the microscopic scale with fast-time chemical kinetics. We show careful characterization of the inert material behavior at high impact, as well as, the material behavior under shock compressive reactive behavior. This framework can be utilized to studying other liquid and solid materials to further understand the reactive dynamics at the point where physics and chemistry merge together.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-01-12 without embargo terms","The student, Svjetlana Stekovic, accepted the attached license on 2021-07-15 at 22:10.","The student, Svjetlana Stekovic, submitted this Dissertation for approval on 2021-07-15 at 22:20.","This Dissertation was approved for publication on 2021-07-16 at 15:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #16976 on 2022-01-12 at 12:45:59","Made available in DSpace on 2022-01-12T21:46:51Z (GMT). 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