{"562351":{"#nid":"562351","#data":{"type":"event","title":"Micro-Engineered Materials for Space Propulsion and Pulsed Power Applications","body":[{"value":"\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003EYou are invited to hear\u003C\/strong\u003E\u003C\/p\u003E\u003Ch3 align=\u0022center\u0022\u003E\u003Cstrong\u003EProfessor Nasr M Ghoniem\u003C\/strong\u003E\u003C\/h3\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cem\u003E\u003Cstrong\u003Egive a talk entitled\u003C\/strong\u003E\u003C\/em\u003E\u003C\/p\u003E\u003Ch3 align=\u0022center\u0022\u003E\u003Cstrong\u003EMicro-Engineered Materials for Space Propulsion and Pulsed Power Applications\u0026nbsp;\u003C\/strong\u003E\u003C\/h3\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003E\u003Cstrong\u003EWednesday,\u0026nbsp;August 24th from 3:00-4:00pm\u003C\/strong\u003E\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003E\u003Cstrong\u003EMontgomery Knight 317\u0026nbsp;\u003C\/strong\u003E\u003C\/strong\u003E\u003C\/p\u003E\u003Cp align=\u0022center\u0022\u003E\u003Cstrong\u003E\u003Cbr \/\u003E\u003C\/strong\u003E\u003C\/p\u003E\u003Ch6\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/h6\u003E\u003Cp\u003EAdvances in electrode, chamber, and structural materials will enable breakthroughs in future generations of electric propulsion and pulsed power (EP \u0026amp; PP) technologies. Although wide ranges of electric propulsion and pulsed power technologies have witnessed rapid advances during the past few decades, much of the progress was based on empirical development of materials through experimentation and trial-and-error approaches. To enable future technologies and to furnish the foundations for quantum leaps in performance metrics of these systems, a science-based materials development effort is required. We aim to develop new plasma-resilient material architectures that will enable future generations of electric propulsion and pulsed power technologies through an integrated research approach that combines multiscale modeling of plasma-material interactions, experimental validation, and material characterization. The range of materials of interest in EP \u0026amp; PP include refractory metals, such as tungsten and its alloys (W-Re) and molybdenum, ceramic composites, such as BN and Al\u003Csub\u003E2\u003C\/sub\u003EO\u003Csub\u003E3\u003C\/sub\u003E, high-strength copper alloys, and carbon-carbon composites. These classes of materials serve various design functions; primarily in cathode and anode applications, in accelerator grids, and in beam dumps of HPM sources. The presentation will give a review of our fundamental understanding for the limits of using these materials in EE \u0026amp; PP, and the opportunity to design material architectures that may dramatically improve their performance. We discuss the results of recent research related to three questions: (1) how can we control the thermomechanical response of materials in extreme heat flux and mitigate failure?\u0026nbsp; (2) what are the phenomena that determine the unstable erosion of material surfaces in a plasma \u0026amp; ion environments?, and (3) How can we design materials that beneficially influence the plasma through Secondary Electron Emission (SEE) ? We first review the status of our experimental facilities for simulation of the space environment.\u0026nbsp; Then, we present results of our understanding of the thermomechanics of materials in severe pulsed plasma environments, and the factors that control the erosive instabilities of surfaces.\u0026nbsp; Finally, results of the effects of surface architectures on secondary electron emission will be given.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Ch6\u003E\u003Cstrong\u003EBio:\u0026nbsp;\u003C\/strong\u003E\u003C\/h6\u003E\u003Cp\u003EProfessor Ghoniem holds the \u201cDistinguished Professor\u201d title of the University of California.\u0026nbsp; He is currently professor of Mechanical and Aerospace Engineering, and is also of Materials Science \u0026amp; Engineering at UCLA. He has wide experience in the development of materials in severe environments (Nuclear, Mechanical and Aerospace). He developed some of main multiscale computational methods in defect physics and mechanics. He is a fellow of the American Nuclear Society, the American Academy of Mechanics, the American Society of Mechanical Engineers, the Japan Society for Promotion of Science, and The Materials Research Society. He was the general chair of the Second International Multiscale Materials Modeling Conference in 2004.\u0026nbsp; He serves on the editorial boards of several journals, and has published\u0026nbsp;\u003Cstrong\u003Eover\u0026nbsp;\u003C\/strong\u003E350 articles, 10 edited books, and is the co-author of a two-volume book (Oxford Press)\u0026nbsp; on the mechanics and physics of defects, computational materials\u0026nbsp; science, radiation \u0026nbsp;interaction with materials, \u0026nbsp;instabilities \u0026nbsp;and self-organization in non-equilibrium \u0026nbsp;materials (Nasr Ghoniem and Daniel Walgraef, \u201cInstabilities and Self-Organization \u0026nbsp;in Materials: Part \u0026nbsp;I-Fundamentals of Nanoscience, and Part \u0026nbsp;II-Applications \u0026nbsp;in Materials Design and Nanotechnology,\u201d\u003Cem\u003EOxford \u0026nbsp;Press\u003C\/em\u003E, 2007, 1100 pages.)\u0026nbsp; He graduated 35 Ph.D. students and 25 post-doctoral scholars (14 are currently in faculty positions).\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EThe presentation will give a review of fundamental understanding for the limits of using certain materials in EE \u0026amp; PP, and the opportunity to design material architectures that may dramatically improve their performance.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Professor Nasr M Ghoniem will speak in the Montgomery Knight Building"}],"uid":"33156","created_gmt":"2016-08-12 13:27:52","changed_gmt":"2016-10-08 02:18:43","author":"Corinna Draghi","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2016-08-24T16:00:00-04:00","event_time_end":"2016-08-24T17:00:00-04:00","event_time_end_last":"2016-08-24T17:00:00-04:00","gmt_time_start":"2016-08-24 20:00:00","gmt_time_end":"2016-08-24 21:00:00","gmt_time_end_last":"2016-08-24 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1239","name":"School of Aerospace Engineering"}],"categories":[],"keywords":[{"id":"2082","name":"aerospace engineering"},{"id":"168732","name":"Micro-Engineered Materials"},{"id":"168733","name":"Space Propulsion"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}