Is there a text introduction about ZeroLengthImplemenxContact Element?

[2443631711@qq.com]

Dear STKO
After I open the STKO software, I select ZeroLengthSimplexContact Element and open the window for inputting parameters (as shown in the figure below). After clicking the blue link, I find that the introduction to me is ZeroLengthContact Element, not ZeroLengthSimplexContact Element. Is there any document that describes ZeroLengthSimplexContact Element?

[ValentinaSB]

Dear user 2443631711@qq.com,
you can read the information about ZeroLengthContact Element it will help you to understand ZeroLengthImplexContact Element that you want to use. If it is not enough, try to watch this webinar https://youtu.be/tXA5guozrFU where Dr. Massimo Petracca explained more in detail how this element works.

[2443631711@qq.com]

Thank you for your reply. I have read the document about ZeroLengthContact Element, but I want to know the difference between ZeroLengthContact Element and ZeroLengthASDImplex Element

At present, I only know that ZeroLengthASDImplex Element can connect two units with different degrees of freedom, such as U-P element and structural element,

Besides, what are the differences between them?

[STKO Team]

At present, I only know that ZeroLengthASDImplex Element can connect two units with different degrees of freedom, such as U-P element and structural element,

This is true, and it's about the usage.

Besides, what are the differences between them?

Other than the previously mentioned usage difference, the results they provide is exactly the same, (frictional contact with coulomb friction law). The difference is in the algorithms used which make the ZeroLengthASDImplex more convergent and robust, especially if you use the IMPL-EX integration scheme

[2443631711@qq.com]

ok, thank you very much

By the way, I want to ask which element in stko simulates Goodman contact element? Can you tell me?

[STKO Team]

What is Goodman contact?
Please share some ref

[2443631711@qq.com]

Dear stko,
The following artical explain goodman element clearly
Goodman R E，Taylor R L，Brekke T L. A model for the mechanics of jointed rock[J]. J. Soil Mech.and Found.，Engrg.Div.，ASCE，1968，99(5)：637～660

by the way, i have a new question
Whether non-constant numbers are allowed in the correlation coefficient input of ZeroLengthASDImplex Element, such as nonlinear parameter changes
For example, "Kn" changes with the decrease of soil stiffness, not a constant, but a function. Is this allowed？

[STKO Team]

The following artical explain goodman element clearly
Goodman R E，Taylor R L，Brekke T L. A model for the mechanics of jointed rock[J]. J. Soil Mech.and Found.，Engrg.Div.，ASCE，1968，99(5)：637～660

We cannot go through the article and check whether it is suitable or not. Anyways, the contact element is based on a simple coulomb friction law, with zero initial cohesion and tensile strength.

Whether non-constant numbers are allowed in the correlation coefficient input of ZeroLengthASDImplex Element, such as nonlinear parameter changes
For example, "Kn" changes with the decrease of soil stiffness, not a constant, but a function. Is this allowed？

No, it is constant

[2443631711@qq.com]

Dear stko team
Regarding the ZeroLengthContactASSimplex Element, I would like to ask whether it is allowed to not fill in the parameters of Kn, Kt, and mu, but instead define different zerolength materials in each direction, like the Zerolength element, to simulate different force-displacement relationships in each direction？

[STKO Team]

If you want to do that you can use the standard zeroLength Element.