Problem on grain growth during free sintering: non-uniform domain shrinkage with periodicity #16860
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Dear Moose experts, I want to study the sintering using phase field + tensor mechanics modules. The key outputs I am looking for are the volume shrinkage during sintering and evaluate the effective properties (e.g. elastic stress state) from the whole simulation domain. My initial idea is to setup a RVE with periodic boundary conditions and randomly fill the grains to certain volume fraction (or import from existing packing file), then assign only one order parameter to solve the interface evolution. Then adding rigid body motion, and coupled to tensor mechanics to get the stress/strain fields. If I now consider free sintering with gravity in y-direction, during sintering the pores are closed and grains will shrink in y-direction due to gravity, but the top boundary will still be the same as t=0, so the domain volume is constant, thus the effective volume fraction in the whole domain remains constant. Is it possible to set the domain to move and follow the shrinkage of top layer of grains? I also have a second question on how to apply gravity onto the material: Could you please tell me which option would be better and why? Best Regards, |
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I believe we don't yet have the capability to change the domain size with the shrinking particles. You can use the RVE based analysis to apply load and capture the associated deformation behavior including volume/shape change. https://www.sciencedirect.com/science/article/pii/S0168874X20301165 If you want to model initial powder stacking, you can apply the gravitational force to each of the particles but you will need a way to detect contact between particles to avoid any overlap. |
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I believe we don't yet have the capability to change the domain size with the shrinking particles. You can use the RVE based analysis to apply load and capture the associated deformation behavior including volume/shape change. https://www.sciencedirect.com/science/article/pii/S0168874X20301165
If you want to model initial powder stacking, you can apply the gravitational force to each of the particles but you will need a way to detect contact between particles to avoid any overlap.