University of Minnesota
Aerospace Engineering and Mechanics
Spring 1998 Seminar Series



Micromechanics of FCC Metal Single Crystals

Professor Alberto Cuitiño
Department of Mechanical
and Aerospace Engineering

Rutgers University



Abstract

In this talk, a plausible form of the hardening relations for single crystals is presented. The theory is based on: i) the motion of a dislocation line through forest dislocations; ii) the short-range interactions between pairs of dislocations and the strength of the resulting intersections viewed as point obstacles, and iii) the kinetics of dislocation multiplication.

Then, three-dimensional near-tip fields are characterized numerically. For comparison purposes, the corresponding plane-strain field are also computed numerically and their asymptotic behavior determined semi-analytically. On the basis of these analyses, we investigate: i) the dependence of the fields on the hardening law; ii) the degree of correlation between surface and interior fields in finite specimens; and iii) the degree of correlation between plane-strain and three-dimensional fields.

Finally, a time-dependent deformation mechanism for FCC metal single crystals in which the resulting deformation is produced by the cumulative effect of dislocation glide in each slip systems is introduced. This model presents a self-consistent micromechanical approach where both the time-dependent and independent deformation are linked together.


Friday, May 29, 1998
209 Akerman Hall
2:30-3:30 p.m.


Refreshments served after the seminar in 227 Akerman Hall.
Disability accomodations provided upon request.
Contact Audrey Stark-Evers, Senior Secretary, 625-8000.