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     COLLOQUIUM OF THE COMPUTATIONAL MATERIALS SCIENCE CENTER
AND THE SCHOOL OF PHYSICS, ASTRONOMY, & COMPUTATIONAL SCIENCES
               (CSI 898-Sec 001 crosslisted with PHYS 703)
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       Crystal Plasticity-based Constitutive Modeling
       
                        Minh-Son Pham
Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, and
Center for Automotive Lightweighting, National Institute of Standards and
Technology, Gaithersburg, MD 
 
Advanced materials with high strength-to-weight ratio for  automotive
components reduce the weight of vehicles without compromising their safety
and performance and leads to a reduction in CO2 emissions. An effective
constitutive model that predicts the response of advanced lightweight
materials during formation is required for reducing manufacture costs 
and trial-and-error development cycles. The development of such model 
is the main goal of a current collaboration between the Center for 
Automotive Lightweigting of NIST and the Materials Science and the 
Engineering Department of Carnegie Mellon University. 

In this talk, I will first give an overview on crystal plasticity, dislocation
theory and existing approaches on crystal plasticity-based constitutive
modeling for metallic materials. I will then focus on the development of a
descriptive and predictive constitutive model that includes higher-order
dislocation interactions and preferred crystallographic orientation (i.e.,
texture) to simulate plastic anisotropic behavior of face-centered cubic
materials such as the aluminum alloy 5754-O. Finally, I will discuss on
the need of developing evolutionary constitutive model for long-term
service of materials utilized in power plants and how to improve their design
against fatigue damage.

                            April 21, 2014
                               4:30 pm
                    Room 3301, Exploratory Hall, Fairfax Campus

Refreshments will be served at 4:15 PM.
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Find the schedule at http://www.cmasc.gmu.edu/seminars.htm