[patran] creation mesh

[volaff]

hello to all, mine is more a curiosity than a real question.
in practice I have a certain model in classic ansys created through appropriate hardpoints (which, in practice, are points where, succeed, they will coincide the knots of the mesh) and I came the curisoity of meshare the model using patran and then bind it back into ansys environment.

I was wondering if it was possible or is it more convenient to do everything in ansys? ?

Thank you all!

ps: I press that I have never used patran but if the creation of mesg is better than ansys, a thought I can also do!

 

[Onda]

If you've never used patran, forget it. uses rather hypermesh.
creates mesh much more beautiful in much less time than it spends on patran

 

[volaff]

the problem is that you never even use hypermesh.
You say it's easy to create mesh whose knots match hardpoints created with ansys?
Thank you very much for the answer

 

[Onda]

I don't know how many hard points you have, like your model, I don't know anything.
I used classic ansys, patran and hypermesh.
I would definitely face the problem with hypermesh

 

[volaff]

then I practically have a model already created in classic ansys of an airboard that is defined by section.

the panel consists, in practice, of two skins that are riveted along a common area plus other aprti riveted to completion of the same.

the rivets, practically, were shaped as beam4 elements at whose end there is a knot.

This is the reason why hardpoints were used: on the one hand they were placed there where the rivets went, on the other hand they were used to detect deformation measures at appropriate points (through strain gauges).

In fact, however, the position of some hardpoints was wrong and I managed to correct it by restoring the model from the mesh completely.

Now I have the need to meshare again (in this case every hardpoins will have to coincide a knot) and meshare so that the contact parts have an equal mesh (i.e. congruent knots) so as to study the problem in a coupled way.

I just wanted to know if you can use different software (hypermesh at this point) just for meshare and then go back to working in ansys environment.

Maybe the hypermesh "meshator" is easier, quicker and intuitive than the mesh that does ansys, then I don't know.

Thank you very much and good Saturday!

 

[Onda]

hypermesh e' molto forte per meshare.
prova

 

[volaff]

Well, as soon as I fix the last things I try.
Is any version okay?

 

[Onda]

The one available at your university is perfect!

 

[eih64]

any tool can do what you ask.

 

[volaff]

Thank you all. only now I read your answers.
I got the software thanks to a friend who uses it at the university where he goes, since we use ansys.

cu tips like meshare?
links or tutorials that could help me!?

thanks to all for the disponibility.
ps: for the creation of mesh to congruent knots I think it is still early

 

[Onda]

made the tutorials, they are of great help.
the hypermesh interface is a bit ostica at the beginning, but it is not that patran is better! !
then once you take your hand you fly and you do things that with Patran it would take 10 times the time, to make it worse!

 

[volaff]

thank you hope that in a dozen days at least I can meshare as you must (in fact I use hypermesh only for that to return to ansys then).

Meanwhile I attach a picture of the panel, made of composite material.

ps: start from the tutorials then! !

thanks and good day

 

[volaff]

Dear wave I saw a little the first tutorials regarding hypermesh.
sincerely, thanks to the graphical interface, they seem quite "abbable".

the first tutorials concern selection of nodes and elements as well as creation and modification of geometry.

because, in fact, geometry is the one that I pull out of the ansys model, sec te I could pass to the meshing phase that is the only one for which I will use hypermesh? ?

I don't want to "salt" but, in fact, the initial part would not help me at all.

ps: how do I import ansys file into hypermeh? ?

I tried to create iges and import that but nothing.

Thanks again for the help and good day!

pps: waiting for the continuous answer in "right line" tutorials, so much does not cost much.. :

 

[Onda]

Usually geometry is created in a cad program not in a fem program.
then you care and you create mesh.
iges is a good interchange format, I don't know why you don't work.

normally the correct process is:
model cad->iges or step
hypermesh fe model -> carry in format suitable for prepost
ready to apply loads and constraints, materials and properties.

It is difficult to draw directly with ansys or patran, unless they are very simple geometries. or you want to make some changes to a model already made.
if this is your need, in any case, try to pass through a generic cad, like rhinoceros, importing the model in iges format and see if it shows you something.
attention that in iges you can export only points, surfaces and lines, and not fem elements.

 

[volaff]

the model I have been created directly in ansys and is the one reported in the above fiugres.
It's just the geoemtric model.
Now I try again and see what I can pull out.
Thank you!

the error that pulls out ansys,when I want to create the iges file,is this:

"cannot write iges file hardpoints are defined."

What now?

 

[volaff]

tried and tried but nothing.
At this point I think it's better to mesaher in ansys directly! !

 

[Onda]

Sincerely it seems to me a model so simple that it should not be a problem to recreate it in a cad, parametric or not.
hypermesh has many features to drop mesh points in the chosen points (hard point) which is a sin to lose

 

[volaff]

definitely!
the problem is that at first I wanted to do this but my teacher explicitly told me not to take initiatives then I continued to work on the model already created earlier.

I think I'll keep working in ansys. God help me!
I forgot I don't even know where to take the drawings if I wanted to make it!

 

[eih64]

I want to help you. I need your files, though.

 

[volaff]

If you want, I'll put up the geometric model I have.
Is that okay with you?