Contact

[ZohrehA]

Hi

I want to simulate multi particles impact in cold-spray process.

I have used:

Interaction: General contact
Contact domain: All with self
Contact properties: Tangential Behavior, Normal Behavior and Thermal Conductance
Uncheck "Allow separation after contact" in Normal Behavior,

But the Abaqus job displayed the error "At least one non-blank surface must be specified for contact surface interactions referencing NO SEPARATION surface behavior (see the surface interaction named INTPROP-1)".

Does anyone knows how should I fixed it?

 

[FEA way]

I assume that it's Abaqus/Explicit. You can use "Individual property assignments" in general contact settings to apply this contact property to selected surfaces. That's what Abaqus expects here. And you may have to add rough friction to this contact property.

 

[ZohrehA]

Dear FEA way,

Thanks for your answer.
I also tried it. You mean don't define a Global property assignment and just define Individual property assignment. I am right?

I did it. Since I have a lot of particles I cannot define individual surfaces for each of them, so I select Global and Self in selecting Pairs window. Face an error message that "The global contact property assignment cannot be redefined. This assignment can only be modified in the main dialog."
What is the reason?

 

[FEA way]

You will need a global property anyway, just without the no-separation behavior.

This type of interaction requires individual surface assignments. You have to add them for surfaces of particles that are supposed to behave this way. The same applies to cohesive behavior.

 

[ZohrehA]

Hi,

Ok, so as I understood I have to define global property (general contact--> All wit self), without the no-separation behavior.
1- Then I have to define surfaces for each particle and then at Individual surface assignment I have to select each two pair that have contact with each other, yes? Here I should define another property with no separation behavior and apply it to the contact pairs. Yes?

2- Since I have a lot of particles, defining surface for each and then choosing each two contact pair will take a lot of time! Is there any other and faster way?

 

[FEA way]

Yes, you have to do it as if you were using contact pairs instead of general contact. Maybe the contact pair detection tool in Abaqus/CAE could help you (especially if the surfaces to be bonded are close together). Or some scripting. Otherwise, it's manual work.

 

[ZohrehA]

Ok, Thank you so much.
I will try it.
Just would you please tell me where I can find "contact pair detection tool"?

BW

 

[FEA way]

It’s in the Interaction module: Interaction —> Find contact pairs. There’s also a button for it in the toolbar.

 

[ZohrehA]

Ok, Thanks a lot for your helpful comment.

I run the model but at the end I cannot see the results on deformed shape. The message that appears is attached.

What I have done is:

I used "general contact"--> "Global property assignment" --> "All with self" with separation behavior. And "Individual property assignment"--> with out separation behavior.

I defined two surfaces:
1- whole particles at once and named particle
2-substrate upper surface and named substrate

then at "Individual property assignment"--> "Select pairs and contact property": I selected particle (in Global column) + particle and substrate (at Self column) with 'no separation property'.

In this way I was able to run the model without error. But at the end I cannot see the results of deformed model, because of attached message.
Could you help me why it happend?

 

[FEA way]

Does it work (do you have results) without this individual property assignment ? Are there any relevant warning messages ?

 

[ZohrehA]

Yes it works without individual property assignment. But with separation properties, I need no separation in my model, so I must use individual property assignment for that.
The files for warning are attached.

 

[ZohrehA]

other one