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Nanoindentation Simulation - Prescribe Indentation Load Instead of Indentation Depth?


baotho
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(@baotho)
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Im trying to simulate the nanoindentation of ceramic-polymer layered composites. I have developed an axisymmetric model and have obtained good results for an isotropic material. Most practitioners prescribe the indentation depth as the boundary condition for the indenter and carry out their analysis based on the results. However, for my analysis, I want to apply a load [equal to the failure load of the specimen, as obtained from experimental data] by means of the indenter, and then obtain the stress distribution in the laminate. I have tried applying a concentrated force at the reference point, but the results do not really correlate with the analytical solution. Is there any other way of doing this? Please let me know.

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Jorgen
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I have used that approach many times and it has worked great.
In your case it sounds like you dont get accurate predictions. If that is the case then the problem is likely caused by an incorrect FE model or an inaccurate material model. How do you know that you are using an accurate material model?

-Jorgen

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zvexler
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Posted by: @jorgen

I have used that approach many times and it has worked great.
In your case it sounds like you dont get accurate predictions. If that is the case then the problem is likely caused by an incorrect FE model or an inaccurate material model. How do you know that you are using an accurate material model?

-Jorgen

What material models have you found necessary for your simulations to work? I’m running into solver errors in a similar problem once extreme plastic strains build up under the tip of the indenters. I was hoping wait until I succeeded with a simpler plastic model before adding in other behaviors such as viscoelasticity, but I’m wondering now if the lack of stress-relaxation modes could be behind convergence issues.

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