Learning Forum

[Noura Mansour]

i want to get nonlinear graph between force and displacement I tried but the spring at small forces get graph linear between force and displacement and when i increase the force the spring make deflection in axis prependicular to axis of compression that cause error

 

[peteroznewman]

It would help us understand your model if you include some images in your reply.  An example of a nonlinear spring is a conical spring (like the spring under the negative terminal of a battery compartment) where the coils build up on the base platform as the spring is compressed.  You need to define contact between the spring and the base and turn on Large Deflection to see the nonlinear spring force.

[Noura Mansour]

[Noura Mansour]

can i know type of contact .. and i insert contact between spring and bas or contact between coils of spring also 

[peteroznewman]

Use Frictional Contact.  You will need to define self-contact between the spring and itself as well as the spring and the base.

[Noura Mansour]

What are you meaning by spring and itself

[peteroznewman]

In the Contact defininition, you must select one or more faces for the Contact side and one or more faces for the Target side of the contact.

Select the same face(s) for both.  That is self-contact.

[Noura Mansour]

sorry but when i made a frictional contact this error occured

[peteroznewman]

Looks like your mesh is not connected. In SpaceClaim, on the Workbench tab, use the Share button.

[Noura Mansour]

sorry how can i do it ?
i use anys workbench 2023 R1

[Noura Mansour]

can you tell me how can i fix this problem?

[peteroznewman]

Here is a long list of Google Search results for the term "unable to converge"

Please read most of these discussions for guidance on how to fix this problem.

[Noura Mansour]

[peteroznewman]

In Workbench, right click on the Geometry cell and Edit in SpaceClaim. In SpaceClaim, on the Repair tab click the Extra Edges button then the green check. Click the Extra Points button also. On the Workbench tab click the Share button then the green check. Close SC. Open the Model. You may need to reselect some faces to repair lost scoping.