Learning Forum

[Rameez_ul_Haq]

We see these two possible options under Interface Treatment for all the contact types. Can anyone please tell me the difference between these two? In which cases should any of these be used? Does it make a difference if I use it for linear contacts, or non-linear contacts?

[Akshay Maniyar]

Add Offset allows the user to specify any desired positive or negative distance to offset the contact surfaces. A positive value will tend to close a gap while a negative value will tend to open a gap.
Add Offset, Ramped Effects ramps the interference linearly over all substeps in the load step. This is a useful technique to enhance convergence for challenging interference problems.
Add Offset, No Ramping applies the interference all at once in first substep of the load step.
For more information you can check the Ansys help link.


Thanks Amaniyar

[Rameez_ul_Haq]

,well thanks for the answer.
Can you please tell me any use case of entering a value for offset while solving an interference fit problem?

[Akshay Maniyar]

This is the Ansys How to video for your reference which explains all 3 interface treatment options for interference fit.
Positive offset value is used to model initial interference fits without modifying the geometry: model the geometry in a just-touching condition and use a positive Add Offset value to implement the interference.
Thanks Amaniyar

[Rameez_ul_Haq]

,which face is offsetted when using a value? Contact or Target?