Science / Technology - Colloquium
Friday, February 26, 2010
4:00 PM-5:00 AM
Olin Hall
107
Soft glassy materials are important in a wide variety of applications and industries, including food science, construction, mining, waste management,pharmaceutical, and biotechnology. In many applications the balance between solid-like and liquid-like properties is essential to the function of the material. Many glassy materials exhibit yield stress behavior: they transition from solid-like to liquid-like behavior as the stress is increased. However, in some glassy materials, stress induces the opposite behavior, causing materials to become more solid-like. This unusual behavior is not confined to a single type of glassy material. I will present case studies of shear-induced solid-like behavior in two completely different glassy materials: particle suspensions and the oxide films of liquid metals. In particle suspensions, the solid-like behavior is associated with a jamming transition, which can be characterized with an apparent non-linear elasticity. In oxide metals, the solid-like behavior is associated with shear-induced wrinkling of the oxide surface. Despite the differences in the mechanisms responsible for these effects, both materials share an important characteristic: deformation induces internal stresses that persist even after the stress is applied. These results suggest that the engineering of favorable flow properties requires control of the strain energy that is stored in glassy materials while they are flowing.
Refreshments will be served in Olin Hall 118 at 3:30 P.M.
Cost: FREE
Sponsored by: WPI Physics Department, Dr. Erkan Tuzel
Suggested Audiences: College
E-mail:
etuzel@wpi.edu
Phone: 508-831-5391
Last Modified: February 3, 2010 at 11:45 AM
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