Friday, April 26, 2013
Deformation and Failure Under Extreme Conditions Enabled by Pulsed Laser Loading
Marc Meyers, Professor, Mechanical and Aerospace Engineering, University of California San Diego
The use of high-amplitude pulsed lasers to investigate the response of materials is rapidly growing as the loading, diagnostic, and recovery techniques produce increasingly quantitative and reproducible results. The combination of analysis, molecular dynamics predictions, and experiments are enabling us to probe the materials response at ever higher pressures and strain rates and shorter times.
Three fundamental problems are presented:
(1) Material strength at strain rates higher than 10 7 s-1.
(2) Defect (dislocations/twins/displacive transformations) generation in compression and tension.
(3) Dislocation velocities: transonic and supersonic dislocations.