Abstract

This paper presents a study of microscale plastic deformation at the crack
tip and the effect of microstructure feature on
the local deformation of aluminum specimen during fracture
test. Three-point bending test of aluminum specimen was conducted
inside a scanning electron microscopy (SEM) imaging system.
The crack tip deformation was measured in situ utilizing SEM imaging
capabilities and the digital image correlation (DIC)
full-field deformation measurement technique. The microstructure feature
at the crack tip was examined to understand its effect on
the local deformation fields. Microscale pattern that was suitable

Research integrity: subotage in Univ of Michigan, Ann Arbor

http://www.nature.com/news/2010/100929/full/467516a.html

I wanted to get some insight in the transient stress intensity factor (SIF).

In the time history, we notice there is an overshoot (~27%)  from the
steady state SIF for a fixed (not propagating crack). I found the
overshoot occurs at the time when the reflected wave from the opposite
crack-tip comes back to the first crack tip. I wanted to know why this
overshoot occurs, what is the physical explanation?

Sandip Haldar 

Hi,

I am a graduate student. I want to start learning Molecular Dynamics
specially in respest to Continuum Mechanics/Fracture Mechanics. Can anybody give me some
light about how to start or which textbook to start with?

 I want to use Large-scale Atomic/Molecular Massively Parallel
Simulator (LAMMPS) package (C++ version). Is there any group/person who is using this package? I need some help.

Sandip Haldar

Hi,

I am a graduate student. I want to start learning Molecular Dynamics
specially in respest to Continuum Mechanics. Can anybody give me some
light about how to start or which textbook to start with?

 I want to use Large-scale Atomic/Molecular Massively Parallel
Simulator (LAMMPS) package (C++ version). Is there any group/person who is using this package? I need some help.

Sandip Haldar

Dear Wei and Mogadalai,

As mentioned earlier I am trying to solve for a vector {x} from

{x'}=[A(t)]{x}

where [A(t)] is known matrix of size (2X2) at the max 4x4, elements and are functions of "t".

{x} is a vector (nX1) function of 't'

{x'} is derivative of {x} with respect to 't'.