{"599070":{"#nid":"599070","#data":{"type":"event","title":"PhD Proposal by Jason P Allen","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Eon Thursday, December 7th, 2017\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E10:00 AM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ein Love 295\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION PROPOSAL DEFENSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Efor\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EJason P. Allen\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Modeling the Texture and Property Evolution in Subtractive and Additive Manufacturing of Ti-6Al-4V and Low Carbon Steel Alloys\u0026quot;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Hamid Garmestani, Advisor, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Steven Liang, ME\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Naresh Thadhani, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. David McDowell, ME\/MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf.\u0026nbsp;Preet\u0026nbsp;Singh,\u0026nbsp;ME\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ECommon effects of subtractive and\u0026nbsp;additive manufacturing processes are the development of residual stresses, the evolution of texture and change in mechanical properties, often to the detriment of the workpiece. High speed turning operations on Ti-6Al-4V parts\u0026nbsp;often subjects the workpiece surface to increased\u0026nbsp;temperatures, high strains and strain rates and can lead to phase transformations,\u0026nbsp;recrystallization, growth and\u0026nbsp;grain size\u0026nbsp;gradients\u0026nbsp;while additive manufacturing of low carbon steels, via processes\u0026nbsp;such as the\u0026nbsp;Wire-Fed Directed Energy Deposition (DED), can subject the workpiece to large thermal gradients and thermal gyrations leading to cyclic\u0026nbsp;remelting\/solidification, phase\u0026nbsp;transformations, residual stresses, recrystallization, etc.\u0026nbsp;Crystal plasticity modeling, with suitable flow stress models, have been shown to have good predictive\u0026nbsp;capabilities with regards to modeling the\u0026nbsp;evolution of\u0026nbsp;texture and\u0026nbsp;anisotropic\u0026nbsp;mechanical\u0026nbsp;properties\u0026nbsp;of many different\u0026nbsp;polycrystalline metallic systems (e.g. copper,\u0026nbsp;aluminum alloys, and titanium alloys)\u0026nbsp;for various processes, such as wire drawing or rolling. This proposal seeks to utilize a\u0026nbsp;Viscoplastic Self\u0026nbsp;Consistent (VPSC)\u0026nbsp;crystal plasticity simulation framework to\u0026nbsp;evaluate the evolution of\u0026nbsp;texture and mechanical properties of Ti-6Al-4V undergoing turning operations and low carbon steels undergoing Wire-Fed DED operations. Due to the variability of strain rates and temperatures throughout processing and its inclusion within the VPSC framework, the Mechanical Threshold Stress (MTS)\u0026nbsp;constitutive model is proposed to model the flow stress behavior of these material systems. It is the ultimate\u0026nbsp;goal of this proposed work to identify the processing parameters that yield the\u0026nbsp;most favorable texture and material\u0026nbsp;properties and\u0026nbsp;investigate the possibilities of leveraging current manufacturing processes\u0026nbsp;to tailor the microstructure and material properties in a beneficial manner.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Modeling the Texture and Property Evolution in Subtractive and Additive Manufacturing of Ti-6Al-4V and Low Carbon Steel Alloys"}],"uid":"27707","created_gmt":"2017-11-22 14:19:55","changed_gmt":"2017-11-22 14:19:55","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-12-07T10:00:00-05:00","event_time_end":"2017-12-07T12:00:00-05:00","event_time_end_last":"2017-12-07T12:00:00-05:00","gmt_time_start":"2017-12-07 15:00:00","gmt_time_end":"2017-12-07 17:00:00","gmt_time_end_last":"2017-12-07 17:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}