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Deformation and Failure Behavior of Nanowires and Nanolattices

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SEMINAR

The State Key Lab of

High Performance Ceramics and Superfine Microstructure

Shanghai Institute of Ceramics, Chinese Academy of Sciences

中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室

Deformation and Failure Behavior of Nanowires and Nanolattices

Yong-Wei Zhang

Institute of High Performance Computing, Singapore

时间:2015年8月18日(星期二)下午2:00

地点:2号楼607会议室(国家重点实验室)

欢迎广大科研人员和研究生参与讨论!

联系人:陈立东(4804)

报告摘要:

Nanolattice, an architected structural meta-material, is instrumental in creating lightweight, strong, and damage-tolerant engineering materials. The reliability of nanolattice is often dictated by the mechanical properties of its truss components such as nanowires and nanopipes and its defects, such as notches and voids. An in-depth understanding on the effects of intrinsic factors such as grain boundaries and surface roughness and extrinsic factors such as size, shapes and man-made notches of its components on the plastic deformation mechanisms and failure patterns is of great importance in fabricating nanolattice with high reliability. In addition, the effects of defects such as notches and voids and also testing temperature on the failure behavior of nanolattices remain unexplored. In this talk, we will report our recent progresses in the study of the effects of intrinsic factors such as grain boundaries and surface roughness and extrinsic factors such as sizes, shapes and man-made notches, on the plasticity and failure of nanowires using both nanomechanical testing and molecular dynamics simulations. We will then report our recent work on the effect of temperature and component size on the deformation and failure of nanolattices under compression using both nanomechanical testing and molecular dynamics simulations. Finally, we discuss the effect of notch on the failure behavior of nanolattices under tension using both nanomechanical testing and finite element modeling. These works explore the size effect, testing conditions and flaw sensitivity of nanolattices and their components, using both experiments and simulations, and demonstrates various interesting and unique features of the architected structural meta-materials.

报告人介绍:

Prof. ZHANG Yong-Wei is Principal Scientist and Deputy Executive Director at Institute of High Performance Computing (IHPC), A*STAR, Singapore and Adjunct Professor at Singapore University of Technology and Design. He received Ph.D from Northwestern Polytechnical University, China. Subsequently he worked at Institute of Mechanics, Chinese Academy of Sciences, China; Division of Engineering at Brown University, USA; Institute of Materials Research and Engineering, A*STAR, Singapore; and Department of Materials Science and Engineering at National University of Singapore. His interests focus on using theory, modeling and computation as tools to study the relationship between structures and properties of materials with applications in material design, property engineering, mechanical-thermal coupling and mechanical-electronic coupling et al. He has published over 300 refereed journal papers, and delivered over 50 invited/keynote/plenary talks and lectures.

 
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