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Introduction to mcalibration "Stress relaxation Check"

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aros001
Posts: 6
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(@aros001)
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Hello, I performed the introduction to mcalibration calibrating a TN model following the instructions from the link.

https://polymerfem.com/introduction-to-mcalibration/

I saw the prediction for stress relaxation and wanted to check it performing an Ansys simulation, I didnt get the Stress relaxation response of the material in the simulation. Maybe I made a mistake, so I tried replacing the TN material data for an hiperelastic + prony series to check the stress relaxation of the element, getting the desired response for H+P but not for TN model.

 

 i tried performing the TN model with t = 60 and t = 120 simulations but saw 0 relaxation response.

Toughts?

Best regards.

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Jorgen
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Your image seems to indicate stress relaxation. Can you explain more about the problem?

/Jorgen

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aros001
Posts: 6
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(@aros001)
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Yes, the image predicts stress relaxation, I tried to check it with an Ansys simulation, exported the material as xml and asigned the material to a geometry to test it. It didnt show any relaxation. To check if everything else was ok, I tried with a hiperelastic + prony series and got the expected stress relaxation. So the only diference between the 2 simulations was the material.

I know it is a vague way to ask, but any clue of what could be wrong?

Best regards.

 

 

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aros001
Posts: 6
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I downloaded the archive "Ansys_Seal_RigidSteel.wbpz"from https://polymerfem.com/how-to-simulate-a-teflon-seal-using-ansys/ and first tried the Hiperelastic + prony from Ansys and got positive stress relaxation.

then I tried a TN model with the following parameters



but no stress relaxation was apreciable. 

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Jorgen
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Is that the same TN model that I used? If not, and you want me to investigate, send the wbpz file.

/Jorgen

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aros001
Posts: 6
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I send you a link to the archive, .wbpz are not allowed in "Attach Files".

https://drive.google.com/file/d/1a-ttG1HkZlRbj4j68O9Q7r5xgEjyuA9e/view?usp=sharing

Also I add the Mcalibration file.

https://drive.google.com/file/d/1_d7VpDi-xdC2ubswBU1YlPdUnRSjjdqG/view?usp=sharing

The data used for the TN model is from.

https://polymerfem.com/introduction-to-mcalibration/

Thank you for your time.

 

 

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aros001
Posts: 6
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(@aros001)
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Joined: 11 months ago

I solved the problem.

I just downloaded the PolyUmod library and install it. Then all the simulations started working showing the viscoelastic response.

In conclusion, Mcalibration doesnt work as a standalone.

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