{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/130043"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/130043","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Dynamic mechanical behavior of frozen Ottawa sand subjected to high strain rate loading","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","abstract_has_math":false,"creators":["Aza-Gnandji, Cocou Davis Ruben"],"institution":"University of Illinois Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Baser, Tugce","Elbanna, Ahmed","Carroll, Chris","Ehrhardt, David","Hashash, Youssef"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-07-17","date_published":"2025-07-17","updated_at":"2026-07-22T22:25:06Z","subjects":["Frozen Ottawa Sand","Split Hopkinson Pressure Bar","Temperature-controlled Chamber","High Strain Rate","Impact Loading","Dynamic Mechanical Behavior","Numerical Simulations","High-speed Infrared Camera"],"languages":["en","eng"],"rights":["Copyright 2025 Cocou Davis Ruben Aza-Gnandji"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/130043","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Baser, Tugce","Elbanna, Ahmed","Carroll, Chris","Ehrhardt, David","Hashash, Youssef"]},{"key":"dc:creator","label":"Author","values":["Aza-Gnandji, Cocou Davis Ruben"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-07-17","2025-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"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 Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Frozen Ottawa Sand","Split Hopkinson Pressure Bar","Temperature-controlled Chamber","High Strain Rate","Impact Loading","Dynamic Mechanical Behavior","Numerical Simulations","High-speed Infrared Camera"]}]},{"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 2025 Cocou Davis Ruben Aza-Gnandji"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/130043"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","The student, Cocou Davis Ruben Aza-Gnandji, accepted the attached license on 2025-07-14 at 16:04.","The student, Cocou Davis Ruben Aza-Gnandji, submitted this Dissertation for approval on 2025-07-14 at 16:14.","This Dissertation was approved for publication on 2025-07-17 at 06:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22553 on 2025-10-21 at 10:06:05","Increasing temperatures in the Arctic region raise environmental concerns, but also bring new opportunities for civil engineers including infrastructure development, such as roads, buildings, and pipelines, etc. Extensive research focusing on the behavior of frozen soils under quasi-static loading resulting in small strain rates exist; however, limited studies have explored their behavior under high strain rate loading, which is relevant in construction and resource extraction, etc. This research aims to investigate the dynamic mechanical behavior of frozen sands under varying thermal conditions and to characterize the impact of high strain rates on the overall stress-strain response. Frozen Ottawa sand samples having different dry densities and initial degrees of saturation were tested at temperatures of -15, -10, and -5°C to characterize the mechanical behavior. These samples were subjected to strain rates ranging from 400 to 1500/s using both traditional and modified Split Hopkinson Pressure Bar (SHPB). A temperature-controlled chamber was designed and attached to the SHPB setup to maintain constant temperatures during the experiments. A high-speed infrared camera was integrated to monitor temperature variations during the impact tests for estimating the thermal energy during the tests. The stress-strain curves of frozen Ottawa sand at different temperatures were obtained, and the results indicated that the stress-strain behavior was significantly influenced by the strain rate, temperature, and initial degree of saturation of the frozen sands. Specifically, the stress-strain curves exhibited peak stresses followed by pronounced strain softening when the strain rate was less than 900/s. However, at strain rates above 900/s, relatively more brittle response was observed. The results also revealed that the strength of the frozen Ottawa sand increased as the temperature decreased, due to the enhanced bonding between the ice and soil particles. To further evaluate the behavior of frozen sands under various strain rates, numerical simulations using LS-DYNA were performed. Two numerical methods available in LS-DYNA, namely, the Finite Element Methods and the Smoothed Particle Hydrodynamics, were employed to perform the numerical simulations of the SHPB tests. Holmquist-Johnson-Cook material model was employed in the simulations. Both numerical schemes produced results that were in good agreement with the experimental results. They also revealed the need for the development of advanced material models for the simulations of the dynamic behavior of frozen soils under extreme loading conditions. Key experimental results of this study can contribute to the design of infrastructure and protective structures that may be subjected to high-strain-rate deformations, impact loadings, or explosions. Future research will build on this study to develop a material model with temperature-dependent parameters for simulating the thermo-mechanical behavior of frozen sands under different thermal and extreme loading conditions."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Dynamic mechanical behavior of frozen Ottawa sand subjected to high strain rate loading"]}]}],"canonical_facts":{"dc:contributor":["Baser, Tugce","Elbanna, Ahmed","Carroll, Chris","Ehrhardt, David","Hashash, Youssef"],"dc:creator":["Aza-Gnandji, Cocou Davis Ruben"],"dc:date":["2025-07-17","2025-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01","The student, Cocou Davis Ruben Aza-Gnandji, accepted the attached license on 2025-07-14 at 16:04.","The student, Cocou Davis Ruben Aza-Gnandji, submitted this Dissertation for approval on 2025-07-14 at 16:14.","This Dissertation was approved for publication on 2025-07-17 at 06:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22553 on 2025-10-21 at 10:06:05","Increasing temperatures in the Arctic region raise environmental concerns, but also bring new opportunities for civil engineers including infrastructure development, such as roads, buildings, and pipelines, etc. Extensive research focusing on the behavior of frozen soils under quasi-static loading resulting in small strain rates exist; however, limited studies have explored their behavior under high strain rate loading, which is relevant in construction and resource extraction, etc. This research aims to investigate the dynamic mechanical behavior of frozen sands under varying thermal conditions and to characterize the impact of high strain rates on the overall stress-strain response. Frozen Ottawa sand samples having different dry densities and initial degrees of saturation were tested at temperatures of -15, -10, and -5°C to characterize the mechanical behavior. These samples were subjected to strain rates ranging from 400 to 1500/s using both traditional and modified Split Hopkinson Pressure Bar (SHPB). A temperature-controlled chamber was designed and attached to the SHPB setup to maintain constant temperatures during the experiments. A high-speed infrared camera was integrated to monitor temperature variations during the impact tests for estimating the thermal energy during the tests. The stress-strain curves of frozen Ottawa sand at different temperatures were obtained, and the results indicated that the stress-strain behavior was significantly influenced by the strain rate, temperature, and initial degree of saturation of the frozen sands. Specifically, the stress-strain curves exhibited peak stresses followed by pronounced strain softening when the strain rate was less than 900/s. However, at strain rates above 900/s, relatively more brittle response was observed. The results also revealed that the strength of the frozen Ottawa sand increased as the temperature decreased, due to the enhanced bonding between the ice and soil particles. To further evaluate the behavior of frozen sands under various strain rates, numerical simulations using LS-DYNA were performed. Two numerical methods available in LS-DYNA, namely, the Finite Element Methods and the Smoothed Particle Hydrodynamics, were employed to perform the numerical simulations of the SHPB tests. Holmquist-Johnson-Cook material model was employed in the simulations. Both numerical schemes produced results that were in good agreement with the experimental results. They also revealed the need for the development of advanced material models for the simulations of the dynamic behavior of frozen soils under extreme loading conditions. Key experimental results of this study can contribute to the design of infrastructure and protective structures that may be subjected to high-strain-rate deformations, impact loadings, or explosions. Future research will build on this study to develop a material model with temperature-dependent parameters for simulating the thermo-mechanical behavior of frozen sands under different thermal and extreme loading conditions."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/130043"],"dc:language":["en","eng"],"dc:rights":["Copyright 2025 Cocou Davis Ruben Aza-Gnandji"],"dc:subject":["Frozen Ottawa Sand","Split Hopkinson Pressure Bar","Temperature-controlled Chamber","High Strain Rate","Impact Loading","Dynamic Mechanical Behavior","Numerical Simulations","High-speed Infrared Camera"],"dc:title":["Dynamic mechanical behavior of frozen Ottawa sand subjected to high strain rate loading"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:06Z"}