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Messages - bahmanpbamp

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1
Support Forum / strain analysis- liminate homogeneous deformation kye
« on: January 14, 2019, 04:42:04 PM »
Dear Experts,

I am really confused by atomic strain analysis modifier. I cannot understand whether should I activated" eliminate homogeneous deformation " key or not?!
why should we remove homogeneous deformation? I am modeling a particle impact in z direction to a substrate.

Sorry if the question is very stupid

Best wishes,
Bahman

 

2
Support Forum / Regarding analyzing crystal structures
« on: December 10, 2018, 05:34:54 PM »
Dear OVITO experts,

I am looking for a suitable technique for analyzing crystal structure of ceramic materials like Tio2 during deformation and fracture.

I have studies several existing techniques like  Centrosymmetric,  Bond-angle analysis,  Common-neighbor analysis,  Adaptive common-neighbor analysis, Voronoi analysis and Polyhedral template matching. According to  my studies,  it seems that PTM is the best choice with the highest accuracy for structure analysis. However, I cannot use this method too. Since, Tio2 lattice is Tetragonal and is not available between PTM template structures. I have this problem with other methods too actually!

So, any constructive comment in this regard is highly appreciated.


Yours faithfully,
Bahman




3
Support Forum / Re: Regarding Wigner-Seitz defect analysis
« on: December 05, 2018, 12:43:26 PM »
Dear Constanze,

Thank you very much for your email. So, I can use my 3d model instead!

Best regards,
Bahman

4
Support Forum / Regarding Wigner-Seitz defect analysis
« on: December 05, 2018, 11:25:39 AM »
Dear OVITO experts,

I am going to use Wigner-Seitz defect analysis modifier in 2D.  But I permanently facing with this error:

" Simulation cell is degenerate in the deformed configuration"

Actually, I have changed the  Dimensionality from default 3D to 2D but the problem sill exists. So, any helpful comment is highly appreciated.

Yours Faithfully,
Bahman

5
Support Forum / Re: dislocation analysis
« on: September 20, 2018, 11:41:44 AM »
Dear Alex,

Thank you for your response. yes, my 2D model is made from (111) plane of fcc structure.

Regards,
Bahman

6
Support Forum / dislocation analysis
« on: September 20, 2018, 10:26:56 AM »
Dear experts,

I am going to apply dislocation analysis for a 2D fcc model. However, OVITO tells that it does not support 2D. So, can I make a trick and change the z positions of all atoms from 0 to 1?

any comment is highly appreciated.

Yours Sincerely,
Bahman

7
Support Forum / Dislocation Analysis- tetragonal
« on: September 13, 2018, 04:08:40 PM »
Dear Ovitio experts,
 
I need to apply dislocation analysis on TiO2 rutile structure. Please let me know whether I can use Tetragonal or BCC initial structure with some modifications or not.

Yours Sincerely,
Bahman

8
Support Forum / total strain
« on: August 15, 2018, 04:59:18 PM »
Dear OVITO experts,

As you know OVITO can calculate strain/atom. My question is whether OVITIO can also calculate total strain of the system for example in X or Y direction?
I mean can it take average value over all the strain/atom data and reports a value?

Yours Sincerely,
Bahman

9
Support Forum / Re: stress analysis in OVITO
« on: July 20, 2018, 09:33:51 AM »
stimmt. danke dir!

10
Support Forum / stress analysis in OVITO
« on: July 18, 2018, 10:41:19 AM »
Dear experts,

Please let me know whether OVITO can also calculate stress per atom ? Actually,I personally do not think so! Since, we need to access to the forces!

Regards,
Baham

11
Thank you very much for your helpful comment!

12
Dear Alex,

Thank you very much for your email. Actually, I have a 2 dimensional 111 fcc plane. I am performing sever plastic deformation on this plane and I am looking to use a method to better show crystal modifications inside this plane.

Best regards,
Bahman

13
Dear experts,

I am looking for a method to analysis the structure of crystals in  2 dimensional . However, it seems that almost all of the atomic structure analysis modifiers are not active for 2 dimensional MD.

Yours,
Bahman


14
Thank you very much. It would be really helpful!

15
Dear OVITO experts,

As I now, in OVITO, we can only access to the Start and End Values of a property inside the "color coding" panel. Please let me know whether it is possible to have more values or not.

Yours Sincerely,
Bahman

16
Support Forum / Re: Regarding atomic strain modification
« on: June 06, 2018, 10:41:29 AM »
When I apply the larger model, it still calculates the strain tensors but it seems that the STRAIN TENSORS are not activated inside the Color coding/particle property.So, I cannot access to the strain tensors!

17
Support Forum / Re: Regarding atomic strain modification
« on: June 05, 2018, 05:22:21 PM »
thank  you very much for your email. yes it works. I was doing the same but did not going to the color coding to observe the results!
thank you Alex.

18
Support Forum / Re: Regarding atomic strain modification
« on: June 05, 2018, 04:35:39 PM »
Thank you very much for your response. Actually I am using OVITO rev.2.9.0 on WIN 7.0. Please find attached the dump file from history of model deformation.

19
Support Forum / Re: Regarding atomic strain modification
« on: June 05, 2018, 03:29:58 PM »
Dear Alex,

Thank you very much for your response. Actually, I did what you suggested. But, I have still problem when I activated the strain analysis checkbox during playing the dump movie. Actually OVITO reports  that:

"waiting for input data to become ready"?!

By the way, I have also inserted an initial atomic configuration file as the refrence

Yours Sincerely,
Bahman

20
Support Forum / Regarding atomic strain modification
« on: June 05, 2018, 01:11:24 PM »
Dear OVITO experts,

I am going to compute "atomic strain" by OVITO from a 2D dump file(as per attached). However I face with this error:

"Simulation cell is degenerate in the deformed configuration."

Actually, I checked the box Adjust the simulation size box in the show periodic image box. But, the result is the same!

 The reference file including initial positions of atoms has also been attached.

Any help is highly appreciated.

Yours Sincerely,
Bahman

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