Problem with Connectors 1

[Marquiavel]

Hello everyone, I’m trying to apply connectors to represent the contact (mortar) between a beam and a wall (both represented in shell element). I need to apply two behaviors, axial and tangential, as presented in the image (1). I’m using a basic connector (slide-plane + align), that presents available CORM: U2, U3. When I enter with a negative value to the force F that means a compression to the connector right?

Image (1)

The greatest problem is due to the tangential behavior, I’m getting a undesired displacement between the two shell elements (Image 2). How can I solve this problem?

Image (2)

I’m reading about represent the contact as springs with determined stiffness, as presented in the image (3). How can I do it on abaqus? Can I use the connectors?

Image (3)

If anyone could give some tips, I would be glad.

 

[Mustaine3]

Sounds for me like you used connectors to approximate a contact and you where getting an approximate solution.

Visualize your connectors, check their orientations in the deformed configuration and their forces and displacements.

 

[Marquiavel]

Hi Mustaine3, could you help me check the orientation and the forces of the connectors? How can I do that? When I try to get the results (CTF) from the history output request I get the following message: Fastner domain data is missing.
Do you guys have any tips to my problem?

 

[Mustaine3]

Display connector CSYS: View > ODB Display Options > Entity Display > Show Connectors

"Fastner domain data is missing"
When does this message appear? Have you requested Connector History Output in Preprocessing?

 

[Marquiavel]

Thanks Mustaine3, I'm doing a mistake during the selection of the set. So far,I could not find a solution for to my problem. I’m trying to define a contact that provide me as an axial behavior, a zero stiffness to positive deformation (traction), working only in compression. In addition, I am trying to find a good way to represent the stiffness behavior in tangential direction. Do you know how could I represent it?

 

[Mustaine3]

> a zero stiffness to positive deformation (traction)

What does that mean? No friction?

 

[Marquiavel]

Sorry Mustaine3, I explain it in a poorly way.
I need that the axial behavior of my connector presents stiffness only to compression. When solicited by traction forces I want that the connector present a null stiffness. I try to represent this behavior with the first graphic. When solicited by an axial force of compression (negative), the connector present a small displacement, due to the stiffness of the connector. When the connector solicited by an axial force of traction (positive), the connecter present zero stiffness, so occur a big displacement. Do you think that this consideration is right?