Jae-Hwang Lee

Jae-Hwang Lee

Assistant Professor, University of Massachusetts
Talk Title: Microballistics: An emerging opportunity for quantitative extreme mechanics of nanomaterials
Lee

Exceptional mechanical characteristics of nanomaterials have become a topic of interest in a field of engineering where disruptive innovation is desired. However, there is very little known about nanomaterials’ behaviors under extremely rapid deformation although these are particularly important for defense applications and future manufacturing techniques. Moreover, the collective mechanical properties of an ensemble of nanomaterials such as nanocomposites are nearly undiscovered at this high-strain-rate regime. In this talk, I will present our recent microballistic studies designed to quantify the mechanical characteristics of graphene and carbon nanotubes when being deformed at extraordinarily fast speeds comparable to their speed of sound. As we can capture the extreme deformation events using light pulses shorter than one picosecond, an ultrafast temporal resolution, equivalent to trillions of frames per second, are achieved. Emerging opportunities from this novel mechanical characterization tool will also be discussed

Jae-Hwang Lee has been an Assistant Professor in the Department of Mechanical and Industrial Engineering at the University of Massachusetts Amherst since 2014. He received a PhD degree in Condensed Matter Physics in 2006 at the Iowa State. During his postdoctoral study in the Institute for Soldier Nanotechnologies at MIT, he devised a microballistic technique known as the laser-induced projectile impact test (LIPIT), and has applied LIPIT to the study of extreme mechanical deformation of various materials, including alloys, ceramics, nanocomposites, and tissues

Contact Information

313 Engineering Lab
University of Massachusetts
160 Governors Drive
Amherst, MA 01003-2210