Rigid Bodies in Deformed Configuration

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  • Last Post 06 May 2020
tarunsha posted this 06 May 2020

Hi,

I am trying to simulate the deformation in a helical spring. 

A load is applied to the lower cap on which the spring sits. The spring is supported by an upper cap which I have given as fixed support.

Note that I have kept the bottom cap as a rigid body and the rest as deformable bodies. Now I need to work on the prestressed structure. I have exported the stresses and transferred them to another Static Structural. I also transferred the previous solution to the model of the new static structural(Pic Attached). Everything is going as desired but when the deformed geometry gets transferred from the previous static structural to the new one, the rigid bodies do not appear over here. Only the deformable bodies get transferred. Please help me in resolving this issue.

 

 

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tarunsha posted this 06 May 2020

I can work on the same static structural if I somehow know how to switch the joints on after a certain time. 

peteroznewman posted this 06 May 2020

Please explain how you expect to turn on joints later in the simulation.

If the two sides of the joint have deformed, what do you want the joint to do when it is turned on?  Do you want the joint to connect the nodes at their current location or do you want the joint to "assemble" the two sides and pull them together?

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tarunsha posted this 06 May 2020

Hi Peter,

I want the revolute joint to start acting after the blue surface moves a specific distance w.r.t. to the red surfaces in the y-direction shown in the picture below.

As the blue surface moves up, the springs will develop some stresses. 

peteroznewman posted this 06 May 2020

I see a hole in the part with the blue surface and I see a pin in the center of the adjacent geometry. Use a Cylindrical joint between the pin and the hole. That way, the joint can be on at the start and the blue part will be free to move in the Y direction as well as rotate like a revolute joint.

tarunsha posted this 06 May 2020

Hi Peter,

Thanks for the quick response.

I wanted the blue part to move only in the y-direction(and not rotate) initially for like 28 mm. Then the revolute joint to be turned on where the blue surface will only be able to rotate about the z-axis.

tarunsha posted this 06 May 2020

For clarity, the setup looks like this and I am trying to model the control arm used in FIAT Bogies used in LHB Coaches of Indian Railways.

 

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