Hi everyone, very glad to see you here. My name is Kejie Zhao, a first year phd student working in Prof.Zhigang Suo's group (www.seas.harvard.edu/suo). My concentration is solid mechanics with the same name of this course, it also signifies its importance to my future research. I graduate from Xi'an Jiaotong University in China before coming to Harvard. There I obtained my bachelor and master degree in Engineering Mechanics and Solid Mechanics respectively.

Multiaxial behavior of nanoporous single crystal copper: a molecular dynamics study

Submitted by Kejie Zhao on Sat, 10/27/2007 - 09:11

research

molecular dynamics

size effect

incipient yield surface

The stress-strain behavior and incipient yield surface of nanoporous single crystal copper are studied by the molecular dynamics (MD) method. The problem is modeled by a periodic unit cell subject to multi-axial loading. The loading induced defect evolution is explored. The incipient yield surfaces are found to be tension-compression asymmetric. For given void volume fraction, apparent size effects in the yield surface are predicted: the smaller behaves stronger.

A movie of stress distribution on crack-tip based on MD method

Submitted by Kejie Zhao on Sat, 10/13/2007 - 09:38

video

students

crack simulation

Mechanical behaviors in MD simulations and experiments: loading rate

Submitted by Kejie Zhao on Mon, 09/03/2007 - 09:21

opinion

Plasticity

loading rate

Question: Is the local energy dictating dislocation emission constant for single crystal?

Submitted by Kejie Zhao on Sat, 09/01/2007 - 10:38

opinion

Dislocation

Crystal plasticity

Hi everyone, in my size dependence study, I find the local energy dictating dislocation emission is almost constant for varied sized samples, in given directions of single crystal. I don't know this is an interesing finding, or just a common sense. Will you give me some suggestion, Thank you!

Kejie