Gantry-Crane with Pin Joints ?

Question

Gantry-Crane with Pin Joints ?

yassou (Mechanical)

(OP)

23 Dec 19 13:06

Hi guys
I Simulated something like the below Image.

With Wire features (Like Below):

Now I want this two Red Node act like a pin joint:

Like This Kind of Joint:

How Can I Do That ?
With Best Regards.
yassou.

FEA way (Mechanical) · Answer 1 · 2019-12-23 13:14:18

Actually there’s more than one way to create such hinge joint between beam elements in Abaqus. One method is to add a wire between the nodes, create connector section (join type) and assign it to the wire. Another option is to use equation constraint that will couple translations of both nodes. And finally you could do it with MPC type PIN.

yassou (Mechanical) · Answer 2 · 2019-12-23 15:47:24

Hi FEA way
Thanks for Reply.

Quote (FEA way)
Actually there’s more than one way to create such hinge joint between beam elements in Abaqus. One method is to add a wire between the nodes, create connector section (join type) and assign it to the wire.

My whole model is one part (not separated parts), Therefore there is no 2 nodes between 2 wires, it's just a common Node (Red node) between them.

Quote (FEA way)
Another option is to use equation constraint that will couple translations of both nodes.

Same before, There is no 2 Nodes, It's one common Node, If there is 2 Node then can you explain more?

Quote (FEA way)
And finally you could do it with MPC type PIN.

Same Problem, There is no 2 Nodes, It's one common Node.
With Best Regards.
yassou.

FEA way (Mechanical) · Answer 3 · 2019-12-23 15:51:04

If it’s modeled as a single part then the connection will behave like welded by default (same as with tie constraint). To create pinned joint you need two separate nodes for each joint so you would have to divide the frame into 3 separate parts (horizontal beam and 2 columns).

yassou (Mechanical) · Answer 4 · 2019-12-23 17:12:58

Quote (FEA way)
To create pinned joint you need two separate nodes for each joint so you would have to divide the frame into 3 separate parts (horizontal beam and 2 columns).

Now If I don't want to divide the frame into 3 parts, Is there any options to separate One common Node (Red Node) To two separate nodes ?

FEA way (Mechanical) · Answer 5 · 2019-12-23 17:45:12

Partitions won’t help here since they will result in a single node at the joint anyway. Thus it seems that the only option is to use Merge/Cut Instances (selecting Cut of course).

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