Object overlapped after structural simulation

pranta432 · October 7, 2022, 12:53

Hello,

I want to simulate the movement of a shaft through a cylindrical shape. The shaft has spring support. It needs to push the spring and get through the cylinder. But when I applied the force of 68 N and fixed support beneath the body, the simulation completes and the shaft overlapped with the cylindrical body. It needs to just pass by. I'm presuming the shape of the spring tilting the shaft but I need to make it straight. Please help me with this.

evcelica · October 11, 2022, 10:40

Is it really overlapping, or is the deformation scale exaggerated which makes it look that way. Use True scale for deformation.
Do you have a contact set up between the two bodies (frictional, frictionless, bonded)? The program does not know about any contacts unless they are explicitly set. If everything is scaled correctly and the contacts are set correctly, try more load sub-steps to ramp the load more gradually or switch the contact/target faces. Also try a mesh refinement.

pranta432 · October 11, 2022, 10:49

Thanks for your reply. I've tried with all the contact options available (frictional, frictional, no separation) but the result is the same. I'll try mesh refinement as per your suggestion. But I don't know about the true scale deformation. Where can I find it?

pranta432 · October 11, 2022, 10:51

If you want I can send the model via email for your clear understanding.

evcelica · October 19, 2022, 16:52

The default deformationcale is never true scale, and usually exaggerated. You can change deformation scale from toolbars in mechanical. Display deformation result, then look at your toolbars at the top above your tree for: RESULT: [# Auto Scale], and change it to true scale.
Or look at the deformation values, and calculate if it is really going through the other geometry (is it larger than the original gap?)

October 7, 2022, 12:53	Object overlapped after structural simulation	#1
pranta432 New Member Bangladesh Join Date: Sep 2022 Posts: 3 Rep Power: 4	Hello, I want to simulate the movement of a shaft through a cylindrical shape. The shaft has spring support. It needs to push the spring and get through the cylinder. But when I applied the force of 68 N and fixed support beneath the body, the simulation completes and the shaft overlapped with the cylindrical body. It needs to just pass by. I'm presuming the shape of the spring tilting the shaft but I need to make it straight. Please help me with this.

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October 11, 2022, 10:40		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	Is it really overlapping, or is the deformation scale exaggerated which makes it look that way. Use True scale for deformation. Do you have a contact set up between the two bodies (frictional, frictionless, bonded)? The program does not know about any contacts unless they are explicitly set. If everything is scaled correctly and the contacts are set correctly, try more load sub-steps to ramp the load more gradually or switch the contact/target faces. Also try a mesh refinement.

October 11, 2022, 10:49		#3
pranta432 New Member Bangladesh Join Date: Sep 2022 Posts: 3 Rep Power: 4	Thanks for your reply. I've tried with all the contact options available (frictional, frictional, no separation) but the result is the same. I'll try mesh refinement as per your suggestion. But I don't know about the true scale deformation. Where can I find it?

October 11, 2022, 10:51		#4
pranta432 New Member Bangladesh Join Date: Sep 2022 Posts: 3 Rep Power: 4	If you want I can send the model via email for your clear understanding.

October 19, 2022, 16:52		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	The default deformationcale is never true scale, and usually exaggerated. You can change deformation scale from toolbars in mechanical. Display deformation result, then look at your toolbars at the top above your tree for: RESULT: [# Auto Scale], and change it to true scale. Or look at the deformation values, and calculate if it is really going through the other geometry (is it larger than the original gap?)