How to create contact surfaces for my structural analysis project?

Muhammad Hamza Taimoor

This is the project I am working on and there are several contact surfaces input between all components. I created the contact surfaces but I am receiving errors in the ouput file saying, "The structure of S2S contact element is quite different than the N2S contact element. No internal CGAP/CGAPG elements are created for S2S contact." 

Could anyone kindly describe what does this output message portray? 

 

PaulAltair

They are not errors, just for information, an N2S contact creates 'invisible' bushes between secondary nodes and main surfaces, whereas an S2S surface contact does not:

This page in the manual gives a good overview of the differences between the 2 types:

Contact - OptiStruct Manual (2022.3)