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Coupling Manufacturing, Mechanics and Materials Design in Additive Manufacturing Applications

le 5 février 2015
13H30

Wing Kam LIU, Professor of Mechanical Engineering,Northwestern university, interviendra à l'ENS Cachan lors du séminaire du LMT

Wing Kam Liu, PhD, PE, Walter P. Murphy Professor, Northwestern University
President of the International Association for Computational Mechanics
Chair of the US National Committee on TAM within the National Academies
Founding Chair of ASME NanoEngineering Council
Founding Chair of the NSF Summer Institute of Nano Mechanics and Materials
http://www.tam.northwestern.edu/wkl/liu.html, w-liu@northwestern.edu

3D printing or additive manufacturing refers to the various processes for printing three-dimensional objects.  The Laser Engineered Net Shaping (LENS) process deposits layers of metallic particles on a substrate and fuses them via a high-powered laser. The accumulation of these fused layers yield a final 3-D component which in many cases would be impossible by other manufacturing methods. However, for implementation of such components in a fully operational system, an aircraft engine for example, a much more comprehensive study of the subscales of the material and their corresponding behaviors is required. Repeatability and control of the microstructure, and subsequently the final material properties, of LENS manufactured components from the standpoint of process parameters such as laser power, feed-rate, hatch spacing, layer depth, and others is incredibly important. Due to the highly localized nature of the key physics and mechanics of the process we must turn to multiscale simulation methods which give us the capability of extracting the essence of the phenomena that occur within these fine-scale regions. The LENS process also provides an excellent materials design challenge. The material microstructure constituents are inherently modularized by the powder mixing process which combines a specific composition of assorted materials to obtain desirable material properties for the component. We turn to multiscale simulation and design for a combined optimization of the (1) material composition, (2) material microstructure, and (3) process parameters for direct control of the product-level performance.

Vita: 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. His ISI and Google citations and H factors are (14,000, 60) and (37,800, 88), respectively. In 2014, 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 and the Chair of the US National Committee of Theoretical and Applied Mechanics (USNCTAM). 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 X (SdX) specialization program between ME and CEE departments. 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.

Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci de - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
Plan d'accès

Agenda des séminaires 2013


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