{"678380":{"#nid":"678380","#data":{"type":"event","title":"PhD Defense by Keara Frawley","body":[{"value":"\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EKeara Frawley\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EAdvisors: Rampi Ramprasad \u0026amp; Naresh Thadhani\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003Ewill defend a doctoral thesis entitled\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003E\u003Cstrong\u003EDesign Of Materials Tolerant To Dynamic Tensile Spall Failure\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003E\u003Cem\u003EOn\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cbr\u003ETuesday, November 26 at 1:00 p.m.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;Virtually via MS Teams\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/teams.microsoft.com\/l\/meetup-join\/19%3ameeting_ODU5MzViN2ItODE3OS00MGQwLTgzNjctNTdlYzQzZjk5MjNl%40thread.v2\/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%2272ea7c32-bb6b-47fa-bf38-2be6fd92a1aa%22%7d\u0022 target=\u0022_blank\u0022 title=\u0022https:\/\/teams.microsoft.com\/l\/meetup-join\/19%3ameeting_ODU5MzViN2ItODE3OS00MGQwLTgzNjctNTdlYzQzZjk5MjNl%40thread.v2\/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%2272ea7c32-bb6b-47fa-bf38-2be6fd92a1aa%22%7d\u0022\u003Ehttps:\/\/teams.microsoft.com\/l\/meetup-join\/19%3ameeting_ODU5MzViN2ItODE3OS00MGQwLTgzNjctNTdlYzQzZjk5MjNl%40thread.v2\/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%2272ea7c32-bb6b-47fa-bf38-2be6fd92a1aa%22%7d\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECommittee\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u2002\u2002\u2002\u2002\u2002\u2002Dr. Rampi Ramprasad \u0026nbsp;\u2013\u0026nbsp;School of Materials Science and Engineering\u003C\/p\u003E\u003Cp\u003E\u2002\u2002\u2002\u2002\u2002\u2002Dr. Naresh Thadhani\u0026nbsp;\u2013 School of Materials Science and Engineering\u003C\/p\u003E\u003Cp\u003E\u2002\u2002\u2002\u2002\u2002\u2002Dr. Chaitanya Deo\u0026nbsp;\u2013 School of Mechanical Engineering\u003C\/p\u003E\u003Cp\u003E\u2002\u2002\u2002\u2002\u2002\u2002Dr. Chao Zhang\u0026nbsp;\u2013 School of Computational Science and Engineering\u003C\/p\u003E\u003Cp\u003E\u2002\u2002\u2002\u2002\u2002\u2002Dr. Jennifer Jordan \u0026nbsp;\u2013 UK Program Office Technical Deputy, Los Alamos National Laboratory\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EMaterials tolerant to dynamic tensile or \u201cspall\u201d failure are of interest for applications involving high-velocity impact and blast loading. Metals and polymers generally have favorable responses to such extreme conditions and are therefore useful materials in shock-absorbing applications, such as the automotive industry, body armor, or other protection and shielding devices. The complex stress states and high strain rates involved in events leading to spall failure are typically different from the conditions under which most material testing is conducted to determine mechanical properties. Hence, it has been difficult to predict how spall strength, i.e., resistance to dynamic tensile failure, relates with typical mechanical properties such as hardness, toughness, strength, and moduli. This work focuses on utilizing machine learning (ML) to determine the relationship between these key properties and spall strength, with the goal of developing predictive models and a better understanding \u0026nbsp;of the spall response behavior of metals, alloys, and polymers.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EVarious methods were utilized to generate databases of spall strengths and key properties of metals and polymers through literature surveys and experiments. Sources included peer-reviewed journal articles and gas gun plate-on-plate impact experiments. Data analytic methods, such as the Pearson correlation and the coefficient of determination, were used to correlate the properties to spall strength.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe first main result of this work is a model that predicts the spall strength of metals and alloys. The study provides design guidelines for efficiently screening metals based on commonly available mechanical properties that most influence the spall strength values, minimizing reliance on intensive experimental procedures. Furthermore, the model has been extended to predict the spall strength values of a class of complex alloys for which there is limited data available: high entropy alloys (HEAs). The second main result is a database of the spall strengths of 22 unique polymers, either experimentally determined in this work or available in the literature. This database also includes the available mechanical and physical properties of the various polymers, and correlates those to predict the spall strength based on a physically-based energy balance model available in the literature. Additionally, an initial exploration using Molecular Dynamics (MD) simulations to model spall failure was conducted on a simple polymer, polyethylene, to evaluate how this computational approach might perform across a broader range of polymers. By learning more about the influence of material properties on the spall strengths of different classes of materials, we can better understand and predict the spall response of untested materials.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EDesign Of Materials Tolerant To Dynamic Tensile Spall Failure\u003C\/strong\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Design Of Materials Tolerant To Dynamic Tensile Spall Failure"}],"uid":"27707","created_gmt":"2024-11-12 20:42:25","changed_gmt":"2024-11-12 20:42:56","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2024-11-26T13:00:00-05:00","event_time_end":"2024-11-26T15:00:00-05:00","event_time_end_last":"2024-11-26T15:00:00-05:00","gmt_time_start":"2024-11-26 18:00:00","gmt_time_end":"2024-11-26 20:00:00","gmt_time_end_last":"2024-11-26 20:00:00","rrule":null,"timezone":"America\/New_York"},"location":" Virtually via MS Teams","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}