ESAFORM Plenary Speakers

2016

 
 

Frederic Barlat

Frederic Barlat

Pohang University of Science and Technology, Korea

Professor Barlat received a PhD in Mechanics from the Grenoble Institute of Technology, France, in 1984. The same year, he joined Alcoa Technical Center near Pittsburgh PA, USA, the research facility of Alcoa Inc, where he conducted scientific research for more than 20 years. Since 2007, Dr. Barlat is a professor at the Pohang University of Science and Technology (POSTECH) in the Republic of Korea. His research focuses on the development of innovative plasticity theories for metals, as well as forming process and manufacturing technologies for steel products. Professor Barlat has actively participated in the scientific committees of various international conferences and is currently a member of the Board of Directors of the European Scientific Association for Material Forming (ESAFORM). He is an associate editor of “Modeling and Simulations in Materials Science and Engineering” and “International Journal of Material Forming.” He has published over 250 articles in peer-reviewed scientific journals. His work has been recognized by a number of awards among which, the ASM Henry Marion Howe Medal of the Material Society in 1995 for the best technical paper published in Metallurgical Transactions A and, in 2013, the Khan International Medal for outstanding life-long contributions to the field of Plasticity. Finally, in 2015, a special issue of the International Journal of Plasticity was published in his honor.

Multi-Scale Approach to Constitutive Modeling of Plasticity in Non-Proportional Loading

This presentation discusses constitutive modeling approaches of anisotropic plasticity at different scales for non-proportional loading. The purpose of this work is to provide a continuum constitutive description, namely, a distortional plasticity model defined with an appropriate yield condition, suitable for practical application in industry. At the mesoscale, the deformation of a single-phase material is investigated using a visco-plastic self-consistent (VPSC) crystal plasticity model. In parallel, the influence of a hard second-phase distribution embedded in a softer matrix is investigated using finite element simulations of a representative volume element. Finally, at the microscale, the dynamics of dislocation accumulation is addressed to assess the critical resolved shear stress in a single grain for slip and reverse slip. The lower scale approaches are developed to validate or suggest modification to the macroscopic model through virtual experiments.

Ram Upadhyay

Frederic Barlat

Senior principal Engineer GE Global Research Center Schenectady, New York

Dr. Upadhyay is a Senior Principal Engineer for Composites Technology in the Manufacturing and Materials Directorate at GE Global Research in NY USA. He has more than 30 years of experience working with numerous GE businesses - Aviation, Power & Water, Health Care, Lighting, Plastics, and Transportation. His expertise includes Polymer and Ceramic Matrix Composites processing, process modeling, automation and pro-active manufacturing process control. Ram has a B.Tech. in Aerospace Engineering - Indian Institute of Technology at Kanpur, MS and PhD - Cornell University. His main thrust has been to support introduction of light weight composite parts in GE aircraft engines notably F404, F414, GE90, GEnX. In last five years he has been focusing on introducing Information Technology tools and Automation in manufacturing environment to reduce cost and increase productivity. Dr. Upadhyay is the author of over 40 publications and technical society presentations, and holds over 15 patents related to various composites processes.

Polymer Matrix Composite Applications in Aerospace Industry - Real-time Decisions by Real-time Modeling

Light-weight composite components in today's airline industry continue to drive high fuel-efficiency, low-noise and low emissions. Most of these components tend to be high by performance and value-added applications with complex geometries e.g. fan blades, fan containment case and flow directing guide vanes. However, processing of these components with high success rate require a delicate trade-off between internal defects, local fiber structure and external dimensions. The variability in material chemical/physical properties and thermal/pressure histories pose challenges that limit the entitlement yield and add significant cost. This challenge can be overcome only by adapting the process for each part. By measuring relevant features during manufacturing process, feeding this information to real-time physical models, and getting feedback regarding process changes based on predicted quality - part to part adaptation can be implemented. Recent advances in new modeling techniques based on PGD (Proper Generalized Decomposition) formulation enables us to build physical models capable of responding in seconds rather than hours. These models can embed key material properties, process parameters and boundary conditions as dimensions which can cover entire process space and are capable of making real-time processing decisions.

Ming-Jen Tan

Frederic Barlat

Nanyang Technological University (NTU), Singapore

Ming-Jen Tan is currently the Director in Building & Construction (B&C) Programme at the Singapore Centres of 3D Printing (SC3DP) at Nanyang Technological University (NTU), Singapore. The SC3DP is a recently launched 100 million Euros national centre geared towards comprehensive 3D Printing technologies for advanced manufacturing (including bio and food printing), of which the B & C programme is part of. Prof. Tan received both his B.Sc.(Eng.) and Ph.D. from Imperial College, London, and has worked in various forming technologies of light alloys, including extrusion, superplastic forming, powder metallurgy and metallic composites. He was a Science & Technology Agency (STA) Fellow in the Mechanical Engineering Laboratory in Tsukuba (Japan), and Fulbright Research Scholar at UCLA and Northwestern University in the U.S., and Visiting Professor/Researcher at Columbia University, Supmeca, and City University Hong Kong.

Additive Manufacturing - Systems, Material & Challenges for Building & Construction

3D printing (3DP), also commonly known also as additive manufacturing (AM), is a promising technology that can fabricate three dimensional complex shape prototypes directly from computer-aided design (CAD) model without any tooling and human intervention. Owing to its peculiar characteristics, AM is widely used in many industries to assist in the design, manufacture and commercialization of a product. More recently, this technology has been extended to the building and construction (B&C) industry in order to mitigate some of the critical issues such as shortage of skilled labour, high production cost and construction time, health and safety concerns of the workers in the hazardous environment etc. However, compatibility of presently available materials, processes, build size and associated costs present significant barriers against widespread application and commercialization. This paper summarizes the currently available 3DP systems and the respective materials that have been used thus far by various experts, industries for B&C purposes. Finally, the benchmarking properties of theses material, challenges and potential research directions are briefly discussed.

Roland Keunings

Frederic Barlat

Louvain School of Engineering, ICTEAM Institute, Université catholique de Louvain (UCL), Belgium.

Roland Keunings is currently Professor of Applied Mathematics at the Université catholique de Louvain (UCL), Louvain-la-Neuve, Belgium. In 1982, he earned a PhD in Engineering Science from the UCL. He then worked for five years at the University of California and the Lawrence Berkeley Laboratory (USA), first as a Research fellow of the Miller Institute for Basic Research in Science, and later as a Divisional Fellow at the Center for Advanced Materials. During those years, he conducted pioneering research on numerical techniques for the simulation of complex flows of highly viscoelastic liquids. In 1988, he returned to the UCL, first as a Lecturer, and since 1996 as a Full Professor. His research focussed successively on micromechanical modelling of composite materials, parallel scientific computing for non-linear finite element simulations, and, over the last two decades, multi-scale modelling and simulation techniques for rheologically-complex fluids. Keunings served for 11 years as Editor of the Journal of Non-Newtonian Fluid Mechanics, the premier scientific journal in the field. Between 2004 and 2009, he was UCL's Pro-Rector for Research. Keunings' research accomplishments have been recognized by the prestigious Weissenberg Award of the European Society of Rheology (2005), his election as Member of the Royal Academy of Belgium (2009), and an Honorary Degree of Doctor Honoris Causa of the Ecole Centrale de Nantes, France (2013).

New Developments in the Multiscale Modelling of the Flow-Induced Microstructure in Fibre Suspensions

Most simulation software available today for the analysis of microstructure development in processing flows of fibre-reinforced composite materials make use of phenomenological modifications of the classical Jeffery model developed for a dilute suspension of rigid ellipsoids in a Newtonian fluid. Consideration of industrial applications calls for more advanced theoretical models. In this talk, we give an overview of the different facets of our ongoing collaborative studies on the multiscale kinetic theory modelling of fibre suspensions. We address several topics that go beyond the framework of Jeffery's model. These include higher-order velocity gradient descriptions to take account of fibre size and bending effects, fractional modelling for describing the suspension elastic behaviour, fibre-fibre interactions, non-Newtonian rheology of the suspending fluid, and confinement effects that arise in narrow-gap flows whose thickness is smaller than the fibre length. For each ot these topics, we propose a multiscale theoretical approach, give recent results and discuss open issues.

 

ESAFORM 2016 Plenary Speakers

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