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#1 Re: Salome-Meca usage » SALOME-MECA Result is not correct » Today 18:41:14

If you love Code-Aster then this is the right platform to discuss.

Mr. Patankar, I have visited IIT's many times. And Below are the Website Links which clearly shows GOI promotion of Open Source,,,,Why IIT's using Linux platform and not Windows...

hmm/books.google.co.in/books?id=Z7PLDwAAQBAJ&pg=RA2-PA9&lpg=RA2-PA9&dq=government+of+india+guidelines+to+use+opensource+software+at+IIT%27s&source=bl&ots=if4RafMf5p&sig=ACfU3U0SqTQD7q41swbS3rLgBY2kTMWjvA&hl=en&sa=X&ved=2ahUKEwjTmIHejtzpAhVYH7cAHQlRDkEQ6AEwBXoECAkQAQ#v=onepage&q=government%20of%20india%20guidelines%20to%20use%20opensource%20software%20at%20IIT's&f=false
meity.gov.in/content/major-foss-initiatives

meity.gov.in/content/free-and-open-source-software-foss

opensource.com/government/15/8/india-adopts-open-source-policy

you will get many articles & guidelines by GOI.

Professors have to take initiative towards PROJECTS compulsary solved in Open Source.

Professors tell students to download Ansys student version or crack version.

It is true that Ansys is easy operating then COde-Aster. But if he wants to learn steps in FEA then Code-Aster will make him follow and understand the same.

ALso, Look at Europe, All Good Colleges have their OWN FEA Software, Computational Mechanics as Master's Degree...WHy IIT's not having Computational Mechanics as MTech Degree ---this will be true FEA Programming and Physics Combination.

#2 Re: Code_Aster usage » The software show"ACCESS VIOLATION during READ operation" error » Today 10:50:01

Graphic Card Reading Problem.

The same issue is fixed up in Ubuntu 18.04.

code-aster.org/spip.php?article1112

ww.code-aster.org/forum2/viewtopic.php?id=24611&p=2

#3 Re: Salome-Meca usage » SALOME-MECA Result is not correct » Yesterday 18:43:28

Mr Patankar & Mr. Sukumar,
I understand you both are at IIT's.

Why IIT's Collaborating With Ansys and Not Code aster. Promote Open Source.

Govt. of India has clearly made mandatory to use Open Source Software at IIT's. Like LInux System is widely used.

#4 Re: Code_Aster usage » Nodes are not following the enforced displacements » 2020-05-27 06:22:04

yes it should expand in dx and dy.

simplify your model.
remove any stiffness, mass , damping matrix define.

#5 Re: Code_Aster usage » Nodes are not following the enforced displacements » 2020-05-20 15:16:56

decrease SY, keep on decreasing SY...

u will get result.

at the end of test, what results you want.

#6 Re: Code_Aster usage » Nodes are not following the enforced displacements » 2020-05-20 12:25:57

ECRO_LINE for material is not define.

define it, vary the SY...you will see effect of centrifugal force.

#7 Re: Code_Aster usage » Advice needed with weak springs and contact » 2020-05-18 18:22:58

ORIE_PEAU_3D=_F(GROUP_MA=

for contact faces not define,

not seen your .med file, but remove all sharp corners at contact zone.

#8 Re: Code_Aster usage » Advice needed with weak springs and contact » 2020-05-18 08:59:40

reslin = MECA_STATIQUE(identifier='6:1',
                       CARA_ELEM=elemprop,
                       CHAM_MATER=fieldmat,
                       EXCIT=_F(CHARGE=load),
                       MODELE=model)

you are performing linear analysis.

contact is not define
timestep not define

share your .med file

your .comm file doesnot show steps you have written.

#9 Re: Code_Aster usage » [SOLVED] MUMPS version issue » 2020-05-15 14:29:30

Hi,

If you have Downloaded PETSC Solver. Will you please give detail steps for ubuntu 18.04.

PetSc is important for complex studies.

#11 Re: Code_Aster usage » Nodes are not following the enforced displacements » 2020-05-14 16:23:25

your expansion or contraction due to centrifugal force is directly correlated to your material properties.

#12 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-14 07:04:45

there should not be any rebound of teeth when torque is applied. your observation is right mr. mib.

Can we Raise BUG or Write to CodeAster. How to do it. Is anybody from CodeAster Reading.

#13 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 18:10:50

i think if torque is applied at pcd on driven gear will solve the problem. code aster at present doesnot allow 0D element with weak spring.

if anyone knows how both 0D +liasione solid and weak spring can be incorporated, please reply.

Mr. Konrayo views are welcome.

#14 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 08:24:06

auxillary shaft will also move its centre to Free Axis Say DX on wheel.

you can run at your end, i have tried many options. even Giving Velocity by Rotation Command which allows Centre Defination.
Also, Applied Opposite Pressure in DZ direction to both gears.

We Mech Engineers need reliable solution from code aster.
And Code Aster has to allow Node, Element0, Liasione Solid to wheel without Singaluraity error, when contact analysis is done. As such we have to define Weak Spring additional to run Contact Analysis.
That is my observation.

#15 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 08:12:45

i had block DZ =0.0, but DX is Open for movement. if DX=0.0 is also block, Wheel stops Rotation.

#16 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 08:09:23

ref attachment

cannot upload video file size 14mb. sending screenshots

#17 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 07:34:23

solver do converge in AUTO mode. But the Driven Gear shifts in DOF axis. Say DY is 0.0, Gear tries to shifts in DX, DZ. This changes centre distance and thus your torque data goes wrong...Reaction Force goes wrong.
yes it is grabcad file
i am using astk 14.4

#19 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-13 06:03:36

ok. see attachment.

we can raise bug to code-aster.
Torque has to be applied to PCD of Gear.
And Code Aster doesnot allow defining 0D Element with Liasione Solid to apply torque , in contact analysis.

Hope, somebody from code aster is reading this.

#20 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-12 17:24:00

i hv define contact face as you have done.

i hv gone through your png.

what is p ----in geometry

what changes you suggest in my .comm file. how to strictly maintain centre distance between gears.

to apply torque i tried defining 0D element and LIasione Solid with Driven Gear,,,but gives Singaluraity Error because of Node on 0D element.

#21 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-12 17:22:57

here i hv attach sepaerate mesh files.
compound them.

#22 Re: Salome-Meca usage » Units used in Salome-Meca? metres or millimetres? » 2020-05-12 14:18:09

tonne/mm3
is not acceptable

If N, mm, MPa, Tonne/mm3 i am using

#24 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-12 08:06:09

I did not get very clear,

There is a extra say rectangle object on Driven Gear Which will be given pressure against direction of rotation of driving gear.

a small screen shot can you send

#25 Re: Code_Aster usage » Friction force depending on the timestep » 2020-05-12 06:39:53

@mib @konyaro

"
"i modify the time step set like this : 0.01;0.02;0.022;0.024;0.026;0.028;0.03;0.04;0.05
run the solver and i obtain the convergence

during temporal window from 0.02 to 0.03 i observe in paravis which the cursor scale of DPL goes to left and after 0.03 to 0.05 goes totally to right."

On above message of MIB.

When i am testing 2 Gears in contact, The Centre Distance Between Gears Shifts. As we fix Single Axis Say DZ,,,but DY,DX are free for movement. if i fix DY & / or DX Gear stops rotation.

To be Realistic Simulation, I have to Apply Torque in Reverse to Rotation to Driven Gear, to Obtain Reaction Load Realistic.
How this can be done. Any Hints.