Learning Forum

[Ken Ng]

Hi,

I am new to Ansys and I am trying to create the normal force for the friction of a pull-out test through the penalty method. So I read the guide and tried to mess around in Mechanical, and I found there are 2 ways to change it to the penalty method, which are the command and the parameter in detail of the contacts. I am not sure which one is the correct way to do the penalty method, so I wonder what are their differences and which is the right one. (actually, I think I failed to use both methods as they all give the same result as "Program Controlled", but I am not sure which parts go wrong

Method 1: APDL command in contacts

et ,cid, 174
KEYOPT,CONT,2, 1
KEYOPT,CONT,3, 1

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v241/en/ans_elem/Hlp_E_CONTA174.html 

Method 2: Change the parameter in detail of the contacts

et ,cid, 174

 

[Ashish Khemka]

Hi,

Why not use the deflaut 'Program Controlled' which is Augmented Lagrange forumulation. For comparison of different algorithms please refer to the links below:

PowerPoint Presentation (ansys.com)

Understanding Basics of Contact - Lesson 2 - ANSYS Innovation Courses

Regards,

Ashish Khemka

 

[Ken Ng]

Hi Ashish,

Thank you for answering, I'll try it and see their differences. And I wonder what is the difference between change the parameters in detail and using the commands code?

Regards,

Ken