contatti in ansys workbench

[Stan9411]

hello to all, I'm starting to use ansys workbench in view of the thesis. I cable quite well with the simulation of states of effort on individual components and I am beginning to consider axioms. are struggling to understand the contact options that ansys offers. What's the difference between "bonded" and "rough" or "no separation"? My professor, who does not use ansys, told me that for the thesis I will also have to simulate a bond of "non-competition" (?!). Can you clarify my ideas? I hope of beings explained well. Thank you all.

 

[emanuelemarzo]

hi , bonded glued i.e. it is as if the piece was joined then do not slide -no separation
no sepration prevents separation but allows sliding
rought allows separation but not sliding. .
ml depends on what you want to get

 

[Stan9411]

Excuse me, if "no separation" allows sliding without separation then what difference is there with "frictionless"?
thanks for the answer however

 

[emanuelemarzo]

Excuse me, if "no separation" allows sliding without separation then what difference is there with "frictionless"?
thanks for the answer however[/quotel
the difference tells you the command precisely.. the scroll but with friction...while frictionless is the slide without friction... generally applies if it is an open contact that supposes that in the post analysis it is going to close. . . example if you have two elements that will then apply forces will go into contact but that initially are not you can define a frictionless contact so that the post analysis will also inform you about that contact. . .

 

[700Hz]

Hello, Stan,
"frictionless" is a non-linear contact and also allows the two surfaces to be detached during the analysis.
"no separation" is a linear contact that does not allow detachment between surfaces.
look at the workbench guide that is not hurt regarding the explanation of contacts.

Bye!

 

[Stan9411]

Hello 700hz thank you. I would have another question: is there a way to simulate the presence of an infinitely rigid body within my structure ? basically in the reality between two points of my structure there is a rough body with a stiffness at least of an order of magnitude higher than the structure that I am analyzing, so I was asked to take into account in the fem. I am told that in general on the fem software there is (hard body ... or similar stuff).

 

[700Hz]

Hi.
you could use a linear material with very high elastic module (e.g. 10 times higher than your material rigid). This is how you solve this situation.

Bye!

 

[Stan9411]

The problem is that so I add an element to model (and I don't know exactly what geometry it has) , meshare and analyze. they tell me there is a way (I talk about the fem in general, I don't know ansys) to make the software understand that between point a and the b is interposed, in reality, something infinitely rigid... but without shaping it. . .

 

[700Hz]

Hi.

I can't tell you... you can set that one of the bodies is rigid, but I don't know if there is an option to "enter" a "virtual" rigid body. perhaps playing with the constraints of movement. . .

 

[volaff]

in apdl between a pair of knots you could put the mpc184 elements to simulate that the knots that united them were a whole, so they moved rigidly.

 

[emanuelemarzo]

in apdl between a pair of knots you could put the mpc184 elements to simulate that the knots that united them were a whole, so they moved rigidly.

By the way, do you know how to set, like in an analysis, an application of a load of 10000 n (an example) and how to save the results ogn increase of load? Thank you!

 

[Stan9411]

Hi.

I can't tell you... you can set that one of the bodies is rigid, but I don't know if there is an option to "enter" a "virtual" rigid body. perhaps playing with the constraints of movement. . .

700hz, if you're still interested, I found the solution. in the connection section it is possible to insert a joint between two surfaces also distant from each other. if you set the joint as fixed in particular the two surfaces will behave as if they were rigidly connected, thus simulating the presence of something extremely rigid.