Event
MSE Special Seminar: Measuring Multiaxial Yield Surfaces in Advanced Lightweight Automotive Alloys
Tuesday, April 9, 2019
3:00 p.m.
1105 Kim Engineering Building
Sherri Tatum
statum12@umd.edu
https://mse.umd.edu/events/mse-seminar-series
Speaker: Tim Foecke, Director, NIST Center for Automotive Lightwighting (NCAL)
Title: Measuring Multiaxial Yield Surfaces in Advanced Lightweight Automotive Alloys
Abstract:
The US Automotive industry is in the midst of a huge materials transition as they shift to
lighter, advanced alloys for vehicle bodies. Modeling and design using these new
materials is hampered by a lack of understanding of their evolving yield surface in
multiaxial stress space, particular along the arbitrary non-linear strain paths seen during
manufacturing. At NCAL, we have focussed on developing new and improved
metrological methods for measuring the yield surface and other critical mechanical
properties. Simultaneously, we characterize the evolving microstructural texture and
phase constituents, and attempt to explain the multiaxial / multipath mechanical response
using methods such as crystal plasticity modeling. In doing this we are trying to develop
insights that could be used to modify thermo mechanical processing of the sheet metal
and produce improved ductility. Our work applying digital image correlation (DIC)
strain metrology to a number of existing and new mechanical testing methods will also be
discussed. Finally, the interactions we have had with Detroit and their metals suppliers
will be detailed, including direct impacts we have had on automotive lightweighting
improvements over the past 15 years.
