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Dislocation migration in carbon onions

Submitted by Jianyu Huang on
research
dislocations
in-situ TEM
carbon onions

Phys. Rev. Lett. 105, 106102 (2010) 

What does a dislocation look like in a spherical geometry, and how does it migrate in such a structure? We report here the counterintuitive motion of the 1/2⟨0001⟩ edge dislocation in carbon onions from the outer surface to the inner core, i.e. from a low pressure surface to a high pressure core, rather than from the core to the surface as expected due to a surface image force. Maybe you can help us to explain this peculiar phenomenon.

Fabric Tensor

Submitted by gyanvikash on
research

I am studying the effect of intermediate microfabric on clay's mechanical behavior. In order to develope the constitutive model for clay considering its microfabric, I want to use fabric tensor. If any good paper or study material on fabric tensor is available then please send me.

Thanks

question about abaqus

Submitted by rainy_boy on
software
question about abaqus

Hi guys

I want to simulate a problem with abaqus,but during runing of my project,percent of process not increas for axample when i change mesh sizes to biger runing go up to 50 % and when i change mesh sizes to smaller than the previos size,it occure again but in 25%

is there any one that know about this problem,i'm trying to solve it for 2weeks but i cann't.

I'm waiting for your suggestions...

Simple Open Source Solver

Submitted by ESPcomposites on
Forums
Computational Mechanics Forum
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industry

I found the below thread, and thought this would be a good place to ask about open source FEM.

forum/357

But unlike that thread, I want something that is very simple, that can be run with just a single .exe.  I only need to solve basic structural problems and perhaps eigenvalue problems.  Orthotropic material capability is needed, but input for a composite material via lamina and stacking sequence would be better.

Abaqus UMAT problem

Submitted by yoon on
Forums
Ask iMechanica
Hello

I'm a new commer in Abaqus and working on topology shape optimization for dental implantation.
I have two user-defined materials for Jaw bone area, and using the stress-increment-controlled method
Young's modulus of an element is changed according to the following equation (1) with two constraints (2)

E(i+1) = E(i) + k(sigma(i) - sigma_ref)   --- (1)

where k and sigma_ref are constants

E(i+1) = E_min if E(i+1)<E_min
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