主讲人：Wing Kam Liu 教授（ Northwestern University）

题目：Modeling and Simulation Challenges in Materials Design for Additive Manufacturing and Nano Manufacturing Applications

地点： 综合实验一号楼602室

主办单位：工业装备结构分析国家重点实验室、工程力学系

开始时间： 2016年12月3日（周六）上午10:30-12:00

摘要：

Additive Manufacturing (AM) enables the printing of 3D complex geometries that are otherwise impossible to manufacture, such as a part within a part. AM comes in many different varieties for numerous material systems including polymeric, biological, cement-based, and metallic materials. These processes typically involve an accumulation of cyclic phase changes, e.g., melting and solidification of metallic particles, until the desired 3D geometry is achieved. This has major implications for concurrent material and product design as it is quite simple using AM to adjust material composition for bulk property improvement or functional grading within the material. The primary focus of this talk encompasses the specific areas of multiscale modeling, materials characterization, and process modeling for final product performance of additively manufactured metallic components. The proposed approaches are applicable to other material systems with the appropriate amendment of materials physics and manufacturing processes. I will also give a short overview on the modeling of nano-manufactured metallic structures – as fundamental building blocks for the creation of architected periodic lattice materials with controllable properties – with respect to their effective mechanical properties. Trusses or lattices offer an ideal testbed as they may serve as building blocks for, in principle, arbitrarily complex structures created by nanomanufacturing techniques. Specifically, we will study the relationship between base material properties, truss architecture and effective properties. The nano-manufacturing process not only influences microstructural material features but it also induces residual stresses and strains that may affect deformation and failure mechanisms and thus the lifetime of the manufactured structures.

主讲人简介:

Professor Liu is a world leader in multiscale simulation-driven engineering and science. His research has benefitted the understanding and design of nano-materials, engineering material systems and additive manufacturing, biological processes, and the use of organic and inorganic materials for drug delivery systems, bio-sensing, and other diagnostic and therapeutic applications. Liu is selected as a highly cited researcher in Computer Science and a member of the World’s Most Influential Scientific Minds by Thompson Reuters for the period 2002 through 2012. Liu’s selected honors include 2014 JSCES Grand Prize in recognition of outstanding contributions in the field of computational mechanics, the Honorary Professorship from Dalian University of Technology in 2013, the International Association of Computational Mechanics (IACM) Gauss-Newton Medal; the ASME Dedicated Service Award, the Robert Henry Thurston Lecture Award, the Gustus L. Larson Memorial Award, the Pi Tau Sigma Gold Medal and the Melville Medal, (all from ASME); the John von Neumann Medal and the Computational Structural Mechanics Award from the US Association of Computational Mechanics (USACM); and the IACM Computational Mechanics Award, and the Computational Mechanics Award from Japanese Society of Mechanical Engineers. Currently, Liu is the President of IACM, the Chair of the US National Committee of Theoretical and Applied Mechanics (USNCTAM) and a member of the US Board of International Scientific Organizations. Liu chaired the ASME Applied Mechanics Division and is a past president of USACM. He was the founding Director of the NSF Summer Institute on Nano Mechanics, Nano Materials, and Micro/Nano Manufacturing, Founding Chairman of the ASME NanoEngineering Council, and Founding Director of the Master of Science in Simulation-Driven Engineering Program at Northwestern University. He is the editor of two International Journals and honorary editor of two journals and has been a consultant for more than 20 organizations. Liu has written four books; and he is a Fellow of ASME, ASCE, USACM, AAM, and IACM.