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Dislocation migration in 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.

question about UMAT

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I have read Pro Huang's UMAT for many times and one of its subprogramme I can't understand.

Can anybody help me ?

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gyanvikash's picture

Fabric Tensor

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

anilshirahatti's picture

Creep Analysis in Abaqus

Hi all,

I want to FEA of normal tensile creep test using Abaqus. Can anyone suggest me some notes/books/literature.

Thanks

Anil

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...

FATIGUE CRACK PROPAGATION-- ITS IMPORTANT

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Hello,    

FATIGUE CRACK PROPAGATION-- ITS IMPORTANT

Hello,

       Currently , I am working on the fatigue crack propagation in ANSYS 12.1. Can anybody help me regarding how to get the next cracktip position?

Currently, I am referring to the paper named, “Mixed mode fracture analysis of aluminium repaired panels using composite patches” , Authors : Hossein Hosseini-Toudeshky, Bijan Mohammadi, Hamid Reza Daghayani.

Taxonomy upgrade extras: 

questions about abaqus software package

Hello

I was analyzing pavement subjected to traffic wheel load. I was using the load as cyclic pressure. Suppose an amount of pressure with 200 different time frame. But I am not getting the right result as measured. So, would you please help on applying moving load? How can I assigned that load as moving load? where can I find the step load function? how can I determine the initial increment? is it more realistic to simulate the wheel load as dynamic? how can I do that?

Thanks a lot.
 
 Best regards,

Does Anyone has older version of FRANC3D i.e. version 2.6

 

Hi

 I am facing some problems with FRANC3D 3.2 as my getting different errors. Does anyone has the older version of FRANC3D i.e. version 2.6.

Furthermore all the manuals are for older version.

 

Kindly let me know if anyone has.

 

Thanks

Ayjwat

cantilever column

hello all,

i modeled a cantilever column with eccentric loading to simulate half of ordinary column, i get a small displacement at cantilever tip (equals 1/3 of reality,) so i want ahelp a bout updating geometry during analysis in order to getting effect of second order/nonlinear effects due to eccentric load.my software is ANSYS

thanks for all,

for contacting or sending any information my e-mail address:hany_well70@hotmail.com

Constructing the extension velocity or updating the signed distance of a level set

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Dear all,
I had been looking forward to use level sets to keep track of the surface in a simulation, but one thing has me stumped. Since many here work with XFEM, I was hoping someone might have some valuable input.

I want to simulate flows driven by a surface tension. This will typically yield holes, which will close rapidly. At the point at which the hole disappears, the signed distance function will have a discontinuity.
I would expect this to happen in pretty much any fluid simulation, but I can't see any way to handle it.

M.Hassan Mansouri's picture

boundary condition in plate analysis

Dear All

 I have a problem with some theories in plate analysis such as bending and buckling of plates.

 you know that in various theories of plates, equations have different order and different number of boundary condiotions must be apply. for example in classisal theory of plates we have 4 B.C.,  and in first order shear deformation theory the number of B.C. are 5.

I am confused, how should I recognize the number of required B.C. in each theory?

 

Regards

Mansouri

analysis for large deflection

hello all,

i modeled a cantilever column with eccentric loading to simulate half of ordinary column, i get a small displacement at cantilever tip (equals 1/3 of reality,) so i want ahelp a bout updating geometry during analysis in order to getting effect of second order/nonlinear effects due to eccentric load.

thanks for all,

for contacting or sending any information my e-mail address:hany_well70@hotmail.com

best wishes.

PrinceUS's picture

A new ABAQUS user needs some guideline

I am doing research in Bio mechanics field. I need to
get some urgent ABAQUS/Explicit result from my generated knee model
from MRI information. I am very very new user of ABAQUS. I need your kind
help.  In light of this connection, I am attaching one file regarding
to my quarries . if you kindly guide me for some few steps, I
will continue then on and it would be highly appreciable.

contact problem help in ABAQUS

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i am new to Abaqus and i am unsing Abaqus 6.10

i planned to solve a contact problem by taking a bearing for example problem. i modelled the bearing section in pro-e and inmported it to Abaqus.

*i gave the material properties of steel for both ball and races

* in interferance i defined ball as master and the surfaces in the reces in the bearing as slave. frictionless.

* i gave pressure on the top race and arresteed the bottom race.

* the sides were given symentric with respect to y axis.

when solved i get the job is aborted.

Help in ABAQUS

Hi

I am using Abaqus to model the profiled steel sheet and the dry board will be attached to it. i have two question:

1) i have drawn the profiled sketch and have to extrude it to the proper length. if i do so, then how can i add some points in between the sheet in order to put some springs.

2) if i extrude the created sketch to the certain length (ex. 200mm), can i then copy the created model and paste it there to reach the desirable length for the sheet.

thank you.

i want help to get cracks and strains in r.c columns

Hello all,I am an M.S student, my subject in modelling of high strength concrete column under eecentric loading.

Elastic Deformations & Lie Groups/Algebras

I'm interested in representing elastic deformation in terms of Lie groups/algebras. Is anyone working on this area ? I think it's easiest to start (end !) with homogeneous deformations. Thanks, John.

help about secnd order effect in columns

ello all,

I am an M.S student, my subject in modelling of high strength concrete column under eecentric loading. I made a model of reinforced

 concrete column with in ANSYS by solid65 to represent concrete and link8 for steel.

My model is 200*200*4000 mm, i choose multi., conc.,and elastic linear for concrete, closing crushing for it, for steel bilinear, elastic.

Heip to get second order effect in reinforced concrete column

Hello all,

I am an M.S student, my subject in modelling of high strength concrete column under eecentric loading. I made a model of reinforced concrete column with in ANSYS by solid65 to represent concrete and link8 for steel.

My model is 200*200*4000 mm, i choose multi., conc.,and elastic linear for concrete, closing crushing for it, for steel bilinear, elastic.

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