全校師生：
我校定于2019年6月5日舉辦研究生靈犀學(xué)術(shù)殿堂——?jiǎng)⒂畛谓淌趫?bào)告會(huì)，現(xiàn)將有關(guān)事項(xiàng)通知如下：
1.報(bào)告會(huì)簡介
報(bào)告人：劉宇澄 教授
時(shí) 間：2019年6月5日（星期三） 上午09：00
地 點(diǎn)：友誼校區(qū)航空樓A706
報(bào)告題目：Experimental Analysis and Computational Modeling of Electroplasticity of Nonferromagnetic Ductile Metals.（非鐵磁韌性金屬電塑性的實(shí)驗(yàn)分析與計(jì)算模型。）
內(nèi)容簡介：A multi-physics Internal State Variable (ISV) theory that couples the thermo-elasto-visco-plastic-damage model of Bammann with electricity-related electromagnetic phenomena was formulated with internally consistent kinematics, thermodynamics, and kinetics. An innovative methodology to experimentally distinguish the ElectroPlastic (EP) effect from the thermal expansion was developed and applied to experimentally validate the proposed theoretical electro-mechanical model. Three series of quasi-static uniaxial tension experiments with titanium, copper, and zinc were conducted and a quadratic dependence of the EP stress drop on the electric current density was observed. This study experimentally confirmed the existence of EP as an electron-dislocation interaction phenomenon. The significance of the non-EP effects in the electro-mechanical coupling problems was estimated. The experimental procedure limitations were thoroughly discussed as well as the sensitivity and uncertainty, associated with each of the model parameters. Conclusions and suggestions for future work supplement the study. This piloting work on electro-mechanical coupling opened new horizons for modeling and experimental observation of the electroplastic effect..
（將Bammann的熱彈塑性損傷模型與電磁現(xiàn)象耦合的多物理內(nèi)部狀態(tài)變量（ISV）理論通過內(nèi)部一致的運(yùn)動(dòng)學(xué)、熱力學(xué)和動(dòng)力學(xué)來制定。開發(fā)了一種創(chuàng)新的方法來區(qū)分電塑性（EP）效應(yīng)和熱膨脹，并應(yīng)用于實(shí)驗(yàn)驗(yàn)證所提出的理論模型。進(jìn)行了三系列鈦、銅和鋅的準(zhǔn)靜態(tài)單軸拉伸實(shí)驗(yàn)，并觀察到EP應(yīng)力下降對(duì)電流密度的二次依賴性。該研究通過實(shí)驗(yàn)證實(shí)了EP作為電子-位錯(cuò)相互作用現(xiàn)象的存在。估計(jì)了非EP效應(yīng)在機(jī)電耦合問題中的重要性。詳細(xì)討論了實(shí)驗(yàn)程序的局限性以及與每個(gè)模型參數(shù)相關(guān)的靈敏度和不確定性。結(jié)論和對(duì)未來工作的建議是對(duì)該研究的補(bǔ)充。這項(xiàng)關(guān)于機(jī)電耦合的試驗(yàn)工作為電塑性效應(yīng)的建模和實(shí)驗(yàn)觀察開辟了新的視野。）
2.歡迎各學(xué)院師生前來聽報(bào)告。報(bào)告會(huì)期間請(qǐng)關(guān)閉手機(jī)或?qū)⑹謾C(jī)調(diào)至靜音模式。
黨委學(xué)生工作部
航空學(xué)院
2019年5月21日
報(bào)告人簡介
Dr. Yucheng Liu is the Jack Hatcher Chair Professor in the Department of Mechanical Engineering (ME) at Mississippi State University (MSU) and he currently serves as Graduate Coordinator in that department. Prior to joining MSU in 2014, Dr. Liu was the Assistant Professor of the ME Department at the University of Louisiana at Lafayette (UL Lafayette). Dr. Liu received his PhD degree from the University of Louisville in 2005 and Bachelor’s Degree from the Hefei University of Technology in 1997, both in Mechanical Engineering. Dr. Liu’s research has historically focused on the areas of multiscale material modeling and simulation, high strain rate performance of materials, vehicle systems design and analysis, and hydropower and wave energy technology. His current research interests and activities center on gaining a better understanding of the process-structure-property-performance relations of structural materials through advanced multiscale theoretical framework and integrated computational and experimental methods. To date, Dr. Liu has published about 200 peer reviewed publications, including more than 100 peer reviewed journal articles. He has been the PI and co-PI for over 40 research projects funded by NSF, DOD, DOE, NASA, FAA, Louisiana Board of Regents, and industry with the total amount of $8.2M. Dr. Liu has served as a panelist or a reviewer for several NSF, DOD, NASA, and DOE programs. Dr. Liu is a Professional Engineer registered in Ohio State and holds active membership in ASME, SAE, AAAS, and ASEE. Dr. Liu received the Junior Faculty Researcher of the Year of the College of Engineering at UL Lafayette in 2013, the Outstanding Senior Faculty Research Award from the ME Department in 2016, and MSU Faculty Research Award in 2018. He was elected ASME Fellow in 2017, named to the Jack Hatcher Chair in Engineering Entrepreneurship in 2018, and promoted to Full Professor in 2019.
（劉宇澄博士是密西西比州立大學(xué)（MSU）機(jī)械工程系（ME）的Jack Hatcher講座教授，目前擔(dān)任該部門的研究生協(xié)調(diào)員。在2014年加入密西西比州立大學(xué)之前，劉博士是路易斯安那大學(xué)拉斐特分校（UL Lafayette）ME部門的助理教授。劉博士于2005年獲得路易斯維爾大學(xué)博士學(xué)位，1997年獲得合肥工業(yè)大學(xué)學(xué)士學(xué)位。劉博士的研究歷來側(cè)重于多尺度材料建模和模擬、材料的高應(yīng)變率性能、車輛系統(tǒng)設(shè)計(jì)和分析以及水電和波浪能技術(shù)。他目前的研究興趣和研究活動(dòng)集中在通過先進(jìn)的多尺度理論框架、集成的計(jì)算和實(shí)驗(yàn)方法更好地理解結(jié)構(gòu)材料的過程-結(jié)構(gòu)-性能。迄今為止，劉博士已發(fā)表了大約200篇同行評(píng)審的出版物，其中包括100多篇同行評(píng)審期刊文章。他曾擔(dān)任NSF、DOD、DOE、NASA、FAA、路易斯安那州董事會(huì)和行業(yè)資助的40多個(gè)研究項(xiàng)目的PI和合作PI，總金額為820萬美元。劉博士曾擔(dān)任多個(gè)NSF、DOD、NASA和DOE項(xiàng)目的小組成員或評(píng)審員。劉博士是在俄亥俄州注冊(cè)的專業(yè)工程師，擁有ASME、SAE、AAAS和ASEE的活躍會(huì)員資格。劉博士于2013年獲得UL Lafayette工程學(xué)院年度初級(jí)學(xué)院研究員，2016年獲得ME部門杰出高級(jí)教師研究獎(jiǎng)，以及2018年獲得MSU教師研究獎(jiǎng)。他于2017年當(dāng)選為ASME研究員，于2018年入選Jack Hatcher工程創(chuàng)業(yè)教席，并于2019年晉升為正教授。）
