traction rubber behaviour

[tailele]

hello to everyone, I'll give you my problem.. .then I have difficulty simulating the traction behaviour of a standard rubber already preinstalled in the ansys library (explicit materials). In theory rubber should have linear traction behavior if you do not exceed the yield limit, and a behavior however not linear in compression given the non crystalline structure. Now my problem is the following, I have a very simple structure. .two cylindrical steel wheels of diameter 100 and height 10mm connected along the vertical axis from a 100mm long square bar (always of steel). on the side surfaces of the wheels is a cylindrical rubber standar so that the 2 wheels are put in contact with each other. to make you understand better place 2 scrrens:
- in image 1 you see the two wheels connected by the bar
- in image 2, the 2 wheels with cylindrical rubber covering them
I hope I've been clear. . attached hang 2 forces visible in image 3 in correspondence of the rims on the rubber. constraint the side supports and launch the solutor. from here it gives me unknown error and does not give me the deformed rubber. The strange thing is that if instead of putting rubber as material, I put structural steel, it solves it quietly. What's the problem?

 

[davide_r]

could be due to the fact that the simulation program considers the two discs diameter 100 mm. bound to the square bar, preventing the rubber sleeve from extending virtually. I would try to repeat the analysis without the disks by applying the uniformly distributed load on the two annular surfaces of the rubber sleeve to see what happens, subsequently, evaluating the result obtained I would be right about to be done.

 

[Zaxxon]

Hi.
check the solutor error messages,
tells you everything you're wrong! (or almost).

♪

 

[tailele]

He tells me to go check the solutor's mistakes. Where are they? Now I try to repeat the analysis without disks, but it seems strange to me xke if instead of telling him ke is rubber I give him another material (type steel)do not give me that error

 

[tailele]

I did the test by putting only the rubber tied sideways, but it's okay, it's the same mistake. .

 

[davide_r]

applying as material steel is probably interpreted as a single body with the same mechanical characteristics. at this point I would try to perform the analysis of the rubber sleeve only to see whether the problem is related to the material of the same or to the whole axieme (excluding discs, bar etc.).

 

[tailele]

Yes, yes, I did, but it makes me mistake.. Only with the rubber sleeve.. .

 

[davide_r]

or incorrect steps or try to insert another type of rubber, for example a material with a higher shore hardness and remake everything from head.