travature in apdl

[enrico1979]

Hey, everybody.

I'm adventured in ansys adpl and the tutorials at my disposal date back to previous real estates.
In fact in shaping a 2d beam I should insert a 1link1 element (2d spar), but among the options in the version that I use this item is undocumented.
Now, by trying with other elements at the end the solution presents errors that believe depend exclusively on that initial step of the element.
someone can tell me how to model a 2d element (use ansys 13).
and then, but workbench static structural wouldn't allow me to get to similar solutions?
Only sin is that I believe that wb would not allow to view the trends of internal stresses (at least in terms of trends).
Right? ?

thanks and good evening

 

[luigi.paiano]

If I'm not mistaken in ansys 13 the auctions are beam 4 but I wouldn't miss it.
the goodness of a finite element analysis resides in your ability to approximate in the problem and in a good mesh: It is true that in wb you could get good results but using rod elements is another thing to use three-dimensional elements. with the rod elements you have the advantage of greatly simplifying the problem,do not have mesh problems and avoid unnecessary discretization errors.With solid elements you have to first make a decent mesh and introduce unnecessary complications (you are seeing the beam as a three-dimensional element and simultaneous to ''pappagallo''' what you see) rethinking also you risk introducing spurious tensions.
regarding the use of other elements, what do you mean? or use beams or uses rods. everything depends on what you do, the pc cannot solve your mistakes, it is just a donkey with great computational ability. you must be the designer instead and only you can guide the solution to an acceptable result.

 

[stefano.garbin]

correct the indications of luigi.
I always recommend using updated elements.
instead of link1 use link180
instead of beam4 use beam188
in the guide there are many indications, including "verification manual".

 

[turbin87]

I can't add the real costants after entering the beam160 or beam4 element because? use ansys13. I'm stuck and I can't do a static analysis of a trave uffiiiiiiiiiiiiiiiiiiii

 

[volaff]

But why don't you come before instead of complaining?? ? ? ? ? ?
Can't you?
Have you ever used ansys or is it the first time?
you have seen the recommended tutorials here: http://www.mece.ualberta.ca/tutorials/ansys/

 

[turbin87]

I apologize if I did not introduce myself . However I am a mechanical engineering student and as I have to do the thesis in ansys, I am learning to use it. Anyway, it's been a week I've been using the program and I'm learning. Anyway, I'm already in possession of the unique tutorials you've addressed to me. and it's just following one of those tutorials that I stopped. i.e. he uses the type beam3 for a rectangular section beam, but in ansys13 there is no. so I tried to use both beam161 and beam4. I recognize them though when I click on add to define real costants does not add beam161 and beam4 to me and therefore I cannot continue with the analysis.

 

[volaff]

in ansys 13 it seems to me that the beam3 element has another name but I do not remember which one.
up to ansys 12.1 the beam3 element is in the "2d elastic".

of facts, therefore, I cannot help you using ansys 12.1.

 

[stefano.garbin]

recommend reread this thread well. use links180 and beam188 or beam189 for dots or beams. instead of the real constant used the sections.

 

[turbin87]

Thank you for your help. I honestly thought about beam188, but by the help topics I couldn't understand how to use it for a beam. I have better from what I understand you don't need real costants and so how do I do the rectangular section? Sorry for ignorance, but I don't know English well, and I'm at first with ansys.

 

[turbin87]

however I solved differently using solid45

 

[luigi.paiano]

however I solved differently using solid45

I go back to the old speech:what seems to me that the use of the elements is a little at home.

 

[turbin87]

If I use beam 4, both beam 3 and beam 161, it does not allow me to define the real costants.

 

[luigi.paiano]

If you explain the problem, we try to solve it.

 

[turbin87]

thanks for the availability I solved. practically the problem was that when I went to click with the mouse on add to add the real costant to the beam4 element, a writing appeared that I don't remember now, that didn't make me add the real costants. then I tried to add them using the keyboard and then using the command bar, without using the mouse, and it made me add them.

 

[stefano.garbin]

Thank you for your help. I honestly thought about beam188, but by the help topics I couldn't understand how to use it for a beam. I have better from what I understand you don't need real costants and so how do I do the rectangular section? Sorry for ignorance, but I don't know English well, and I'm at first with ansys.

in the preprocessor.. .
1-create the beam188
2-click on "preprocessor-sections-beam-common sections"
3-will open the "beam tool". where there is written "sub-type" go to select the type of section that interests you (rentangle, round, quarry, ipe...).
4-section id is usually assigned automatically, you can then give a name to help you recognize it. insert the geometric dimensions of the section and possibly the offest of the section regarding the geometric center etc.
5-When you finished click on ok
6-creates beam geometry (axis)
7-on "preprocessor-meshing-mesh attributes-all lines" or "picked lines" define the attributes of mesh, i.e. materials, type of element, leave the real constant, select the id of the section and click ok.
8-generate mesh!