How to define contact stress or contact force ?

Furkan69

I want to create a contact between different materials. But I only know the force of separation with this model. When I do the tensile test, the two structures are separated at 4000 N. There is no break from the material part. Contact surfaces of only two parts are separated from each other.

I want to simulate this tensile test.

So, how can I define and analyze the contact force or stress between two parts in radioss or optistruct software?

 

Could you please help me?

Adriano Koga_20259

Hi,

there are a few nice tutorials to start with:

Go to OptiStruct help page, and look for tutorials

 

 

Furkan69

Adriano Koga_20259 said:

Hi,

there are a few nice tutorials to start with:

Go to OptiStruct help page, and look for tutorials

 

 

Thank you for answer Adriano.

I checked these tutorials but could not find the answers that  I wanted.

Adriano Koga_20259

Furkan69 said:

Thank you for answer Adriano.

I checked these tutorials but could not find the answers that  I wanted.

You can request contact force in OptiStruct by adding the GLOBAL OUTPUT REQUEST, and choose CONTF. Can you share more details on your physical model? Are you working with contact, or some other thing, such as adhesive or spotweld connection? It is not so clear what is your target.

Furkan69

Adriano Koga_20259 said:

You can request contact force in OptiStruct by adding the GLOBAL OUTPUT REQUEST, and choose CONTF. Can you share more details on your physical model? Are you working with contact, or some other thing, such as adhesive or spotweld connection? It is not so clear what is your target.

Actually, I have two part that has different material. (plastic-metal) I joined this part without adhesive, spotweld or weld. I can't explain joining method from privacy. But there is no any material between this parts.

I did the tensile test and reached the separation force of the parts.

How should I create a contact model to separate the two parts from each other at 4000 N?

 

Adriano Koga_20259

Furkan69 said:

Actually, I have two part that has different material. (plastic-metal) I joined this part without adhesive, spotweld or weld. I can't explain joining method from privacy. But there is no any material between this parts.

I did the tensile test and reached the separation force of the parts.

How should I create a contact model to separate the two parts from each other at 4000 N?

 

i believe you can tune an adhesive/cohesive formulation.

You might use HyperStudy to Tune your material properties for the cohesive zone.

 

Another way of doing this is through a nonlinear spring (CBUSH with PBUSHT). You can define the Force x Displacement curve of the spring element and assign it to your model, so that, from a certain force level, it softens. But take care, as it would be a non=linear analysis and you need to avoid the parts of "flying away".