What's the default contact damping value in ABAQUS/Explicit

[robertt3]

Which one is the default setting? All I can find in the ABAQUS document is that "For ABAQUS/Explicit the default value for the tangent fraction is 1.0". But I just want to know if the default setting is "DAMPING COEFFICIENT" or "CRITICAL DAMPING FRACTION" and their default value.

 

[robertt3]

I found these words in document,"For ABAQUS/Explicit the default value for the tangent fraction is 1.0; therefore, by default, the damping coefficient for the tangential direction is equal to the damping coefficient for the normal direction. Furthermore, in ABAQUS/Explicit softened contact and hard penalty contact have a default critical damping fraction of 0.03". Maybe this is what I need.

 

[robertt3]

If you are particularly familiar with this aspect, please also provide practical advice. I would be very grateful!

 

[FEA way]

Furthermore, in ABAQUS/Explicit softened contact and hard penalty contact have a default critical damping fraction of 0.03

Yes, as you can see, the default contact damping for those types of contact (excluding hard kinematic contact) is a critical damping fraction of 0.03.

 

[Marekcom]

Hi all, does this value aplicable for all types of material or an average for ductile materials ?
Thanks !

Structural stress Engineer

 

[FEA way]

Contact damping is independent of material damping. It's just some numerical damping used to eliminate/reduce instabilities and convergence difficulties with contact.

 

[Marekcom]

Ok fair enough. That's a numerical viscosity to help the solver get convergence mostly used in nonlinear analysis. I think the term damping is not appropriate isn't it?

Structural stress Engineer