creating contacts between surfaces in ansys apdl 13

[marcomer]

Bye to all,
I am using ansys 13 for my thesis work and I have some doubts; in particular I should create an frictional contact between multiple surfaces (which on workbench can be done with the contact command) but I cannot find the corresponding command in ansys apdl.
Does anyone know how to do that?

Thank you very much in advance :smile:

 

[Arturo79]

Bye to all,
I am using ansys 13 for my thesis work and I have some doubts; in particular I should create an frictional contact between multiple surfaces (which on workbench can be done with the contact command) but I cannot find the corresponding command in ansys apdl.
Does anyone know how to do that?

Thank you very much in advance :smile:

greetings and sons. contact in ansys classic is a stratospheric ball. . .
cmq uses the help or searches on the net if you find something...it is not easy to explain and understand how the contact in ansys classic works. I only tell you that there is no command like in the wb but you have to discuss the contact area with items count and target..

 

[marcomer]

I just don't understand one thing (actually not just one..): not putting any contact between the surfaces, how are these bodies considered? That is, they do not consider themselves bound in any way between them?

 

[Arturo79]

I just don't understand one thing (actually not just one..): not putting any contact between the surfaces, how are these bodies considered? That is, they do not consider themselves bound in any way between them?

if you do not use any element that simulates contact, the two (or more) bodies are perfectly independent. It's like every body doesn't know about the presence of the other. if you do a test with two independent framed beams, one on the other not initially in contact and apply a force on the upper beam, this will deform and will go to compute the lower beam which will not suffer any deformation.
to say it in poor words, these contact elements are elements interposed between the two surfaces that are in contact or that will come into contact after the application of the load.

 

[marcomer]

I understand.
I now have another doubt..I have seen that to create contact between two surfaces I have to use the commands count and target.. but having more surfaces to contact (in my case I have more than a thousand) just define a single contact and target (by contacting only two surfaces at a time) or should I define a n° equal to the contacts to create? because I want the contact type (and therefore the real costant parameters) to be the same for all surfaces

 

[Arturo79]

I understand.
I now have another doubt..I have seen that to create contact between two surfaces I have to use the commands count and target.. but having more surfaces to contact (in my case I have more than a thousand) just define a single contact and target (by contacting only two surfaces at a time) or should I define a n° equal to the contacts to create? because I want the contact type (and therefore the real costant parameters) to be the same for all surfaces

how do you have more than a thousand contact surfaces!!!!!?????? ? ? ? --
in any case, just define one contact and one target.
a curiosity, but is it a 3d model?

 

[marcomer]

you are a 3d model of a masonry building schematized as a set of parallelepiped blocks.. between each block I have to define this contact

 

[Arturo79]

you have to know that the wider the contact area, the more laborious the calculation and therefore there may also be problems of convergence of the solution. this because contact problems are non-linear problems. so before entering contacts at home studied first well the problem and avoid how many more contacts you can avoid.

 

[Arturo79]

you are a 3d model of a masonry building schematized as a set of parallelepiped blocks.. between each block I have to define this contact

but is it necessary to define the contact? Can't it be useful to represent all the blocks with one block? depends on the type of result you want to get, but it seems to me that your is a case where you can also do without using target surfaces. see well because I repeat, the modeling of contact is a ball

 

[marcomer]

Okay. I'm trying to find some references. .
thank you very much for the availability

 

[marcomer]

I know in fact I have to study two models: one with one block and the other with all these blocks that schematize the masonry.. :

 

[Arturo79]

I know in fact I have to study two models: one with one block and the other with all these blocks that schematize the masonry.. :

Got it! the usual mental saws of the profes to get a little manual to the students:
at least learn how to use contact and then geometry is not complicated.
Then let me know!