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Calibration of viscoelastic material model using load-depth indentation data


mukundsrivastava
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Hi, 

I have the time, indentation depth, and load data of a viscoelastic material from an indentation test. The goal is to understand the local behavior of the viscoelastic material (unlike the bulk behavior that is recorded from a DMA test). 

While using MCalibration, which "Load Case Type" should be selected? Also, how to select the relevant material model for calibration? I wish to use the calibrated data for an ABAQUS/Standard simulation. 

Thanking you, 

Mukund

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Jorgen
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You can analyze that data using MCalibration if you use one of the following load case types: "Abaqus Inverse Solver" or "General Inverse Solver". I created one tutorial about the Abaqus inverse solver option: https://polymerfem.com/mcalibration-tutorial-abaqus-inverse-calibration/ .

/Jorgen

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mukundsrivastava
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Thank you for your help, Dr. Jorgen!
 
The calibration is running, but I'm getting a predicted curve with 0 force values. What could be the possible reasons for the 0 force values?
 
I'm using the ABAQUS External Solver load case to calibrate my indentation parameters. The predicted curve yields 0 force values with the ABAQUS hyperelastic viscoelastic material model. As a troubleshooting step, I have verified my ABAQUS input file by running a Linear Elastic simulation on the ABAQUS standard. The ABAQUS simulation is working well.
 
I have attached the image of the predicted curve for your kind perusal.

 

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Jorgen
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It is difficult to say what the problem is without more info.

Can you provide the mcal-file?

/Jorgen

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mukundsrivastava
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Sure. Please find the .mcal file attached herewith.

Kind regards, 

Mukund

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