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AS_1054067613-Aquamarine
13-Aquamarine
August 16, 2023
Question

Rigid link for assembly analysis

  • August 16, 2023
  • 1 reply
  • 8338 views

 Hello All, 

 

In the attached snap of my assembly, i would like to constraint center point of half circular surface. For that, i was attempting to create rigid link between center point and surface of half circle. and added displacement at center point. Can you please suggest is this a right way to do it? 

Rigid link

 

Thanks 

Ankur Shah

 

 

 

 

 

 

1 reply

A
AS_1054067613-AquamarineAuthor
13-Aquamarine
August 18, 2023

@SweetPeasHub 

Can you please help in this query? 

Can you please share the best procedure to define contacts  and constraints?

S
SweetPeasHub17-Peridot
17-Peridot
August 18, 2023

It is unclear to me what exactly the constraint is trying to accomplish, however the reason it will not work as shown is there is no element connected to the center point. Add a spring to ground at the point with low stiffness, or add a low stiffness spring from there to some arbitrary point on the model. In the image there is a weighted link not a rigid link. An assumption of rigid may not be correct. If the stress near this bolt pattern is not important then this is OK. If the stress near this bolt pattern is important then the boundary condition should include part of the mating components. This is due to St Venant's principal. (you have to have boundary conditions far enough away from area of interest so the approximation error is negligible)

-regards

A
AS_1054067613-AquamarineAuthor
13-Aquamarine
August 18, 2023

@SweetPeasHub 

Thanks for your reply. 

 

Half circular flange will have small metal wheels mounted on holes around the flange. So yes i would like to see if that flange will be under acceptable stress? 

To have this, if i create a spring with low stiffness like 10N/mm connecting center point of half circle flange to half circle flange surface as shown in attached image, do you think it will work?

 

Also i came across another issue with pin joint as shown in problem 2 attached image. Can you please advise what should be my interfaces and constraint to analyze this situation? There is a frame in between blue lugs on both sides locked with pin. Nothing welded here. Middle frame will be in position by 2 of these type of arrangement on both sides. 

 

Appreciate your help.

 

 

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