Geometrically Necessary Dislocations Example at webpage gives errors

[Qamar Hayat]

Please be as detailed as possible, explain what you want to do, what kind of data you are using. Attaching simplified code and data is always useful. Click the the button { } to inline code and finally remove these lines before posting :)

Hi All, 

I am new user of MTEX. I need to see GNDs in the pure Iron sample and for that purpose, I am trying with a tutorial given on MTEX website but as I reach at ''Fitting Dislocations to incomplete dislocation density tensor'' it strat giving following error

Error using curvatureTensor/fitDislocationSystems (line 30)

Optimization Toolbox not found. The funtion fitDislocationSystems depends on the Matlab

Optimzation Toolbox or, more specifically, on the function linprog.

Can you please help me to sort this out and guide which optimization toolbox I need to install in  MATLAB. 

If there are other examples to plot GND please share links of them.  

Kind regards

Qamar 

[Rüdiger Kilian]

Hi Qamar,

the toolbox you'll need is called "Optimization Toolbox". As far sa I see, there's only one toolbox with this name.

Cheers,

Rüdiger

[Qamar Hayat]

Hi Rudiger, 

Thank you for your help. I have installed the toolbox but now I am struck at fitdislocationsystems, it gives following error

 [rho,factor] = fitDislocationSystems(kappa,dSRot);

Error using curvatureTensor/fitDislocationSystems

Attempt to execute SCRIPT fitDislocationSystems as a function:

C:\Users\hayatq\OneDrive - Coventry University\MATLAB\EBSD Toolbox

MTEX\mtex-5.2.8\TensorAnalysis\@curvatureTensor\fitDislocationSystems.m 

uptill dSRot = ebsd.orientations * dS the code works very well but as it goes on it starts giving above error at following line  [rho,factor] = fitDislocationSystems(kappa,dSRot);

Please also see attached screenshot. 

Looking forward for the help. 

Kind Regards

Qamar 

[Rüdiger]

Hi Qamar,
it looks like you have a script with the same name as the function in
your mtex base directory.
Cheers,
Rüdiger

[Qamar Hayat]

Hi Rudiger, 

Thank for your support. It works now and I got GND map but it gives it sort a heat map. I want to get GND and its density as shown in below picture. Can you please guide me how can I get it. 

Regards

Qamar

[Qamar Hayat]

[Qamar Hayat]

On Thursday, 16 April 2020 19:41:18 UTC+1, Qamar Hayat wrote:

On Thursday, 16 April 2020 19:40:08 UTC+1, Qamar Hayat wrote:

Hi Rudiger, 

Thank for your support. It works now and I got GND map but it gives it sort a heat map. I want to get GND and its density as shown in below picture. Can you please guide me how can I get it. 

Regards

Qamar

[Qamar Hayat]

Hi, 

GND example at the webpage ends up finding a total dislocation energy map. I want to calculate GN density can you please let me know how can I find a dislocation density map of each bcc crystal slip system. Another thing is that the dislocation energy map on webpage shows staircase effect at grain boundaries, can you please guide how can I minimize this effect. 

Thanks

Qamar 

On Thursday, 16 April 2020 19:40:08 UTC+1, Qamar Hayat wrote:

[Rüdiger Kilian]

Hi,

factor*sum(abs(rho .* dSRot.u),2)

is the number of GND in 1/m^2.

What you observe along the boundaries is, that mtex should not try to compute a gradient across/on a grain boundary.

Cheers,

Rüdiger

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