Skip over navigation

 

Monitoring Microstructural Evolution in Opaque Specimens under Kolsky Bar Loading

Weinong Chen (Purdue)

Eringen Medal Symposium in honor of G. Ravichandran

Wed 10:45 - 12:15

Salomon 001

Kolsky bars are common high-rate characterization tools for dynamic mechanical response of materials. It is desired to track the microstructural evolution during the dynamic deformation of the specimens, which has not been possible except for a few transparent materials under high-speed imaging. The successful process of amalgamating both the image capabilities present at the Advanced Photon Source and the proficiency of high-rate loading offered by the Kolsky compression/tension bar apparatus are discussed and verification of system effectiveness is expressed via impact on various material systems. Single particle sand interaction along with glass cracking due to impact have been analyzed via the compression setup, while fiber-epoxy interfacial friction, ligament-bone debonding, and single-crystal silicon failure was achieved using a tension bar. Analysis of said material systems being loaded with the Kolsky bar apparatus while visually tracking deformation history via Phase Contrast Imaging demonstratively depicts the effectiveness of the novel union between these two powerful techniques, thereby allowing for in-situ image analysis inside of the material system during loading rates commonly encountered in blast environments.