Woodruff School of Mechanical Engineering
Advanced Friction and Heat Transfer Models for Metal Deformation Simulations
Dr. Steven Schmid
Notre Dame, Aerospace and Mechanical Engineering
Monday, January 13, 2014 at 11:30:00 AM
MRDC Building, Room 4211
In the recent past, finite element-based simulations have become extremely popular, and have found use in troubleshooting or for evaluating tooling designs. Finite element software is readily available, comparably inexpensive, and extremely powerful. The usefulness of these programs has been greatly advanced by the incorporation of advanced constitutive models and yield criterion, auto-remeshing routines, fracture prediction capabilities, etc. A typical use of FEM is for forging, where the sequence of blocking, edging and finishing operations and their associated die cavities can be evaluated before purchase. Such simulations can use the advanced features mentioned, but invariably use a constant friction coefficient or stress and a constant heat transfer coefficient over the entire interface. This cannot be overstated: FEM software will allow five or six variable to describe material behavior, but one variable for interface variables. This obviously has validation confidence concerns. This seminar will present a micromechanics-based approach to determining the friction and heat transfer based on the film thickness that is generated, and implements the models in user routines in the popular software DEFORM. The model requires only mechanical and physical properties of the tooling and workpiece, and the rheological and thermal properties of the lubricant. The tribology module allows for spacial and temporal variation in friction and heat transfer, and correlates very well to experiments.
Steven R. Schmid received his B.S. degree in Mechanical Engineering from the Illinois Institute of Technology in 1986. He then joined Triodyne, Inc., where his duties included investigation of machinery failures and consultation in machine design. He earned his Master's Degree from Northwestern University in 1989 and his Ph.D. in 1993, both in mechanical engineering. In 1993 he joined the faculty at the University of Notre Dame, where he teaches and conducts research in the fields of design and manufacturing. Dr. Schmid received the American Society of Mechanical Engineers Newkirk Award and the Society of Manufacturing Engineers Outstanding Young Manufacturing Engineer Award in 2000. He was also awarded the Kaneb Center Teaching Award in 2000 and 2003, and served as a Kaneb fellow in 2003. Dr. Schmid holds professional engineering (PE) and certified manufacturing engineer (C.Mfg.E) licenses. He is co-author (with S. Kalpakjian) of Manufacturing Engineering and Technology and Manufacturing Processes for Engineering Materials, both published by Prentice Hall, and Fundamentals of Machine Elements and Fundamentals of Fluid Film Lubrication (with B. Hamrock and B. Jacobson), published by Taylor & Francis. In 2012-2013, he served at the Advanced Manufacturing National Program Office, where he helped design the National Network for Manufacturing Innovation program.
Refreshments will be served.