Hello Dear Friends,
I am doing explicit (with mass scaling) crushing analysis of porous media with small dimensions as 50 mm approx in all directions. Displacement BC with tabular data was given.
And I read the reaction force from the impactor surface that is a rigid plate. I applied mass-scaling with caution; no problem on energy levels.
RE: Quasi-static crushing and displacement basedBC
Presumably the momentum of the foam structure causes it to keep moving even after the indenter stops. How is the model constrained on the opposite side of the structure? Can you retrieve reaction forces there?
Lead Research Specialist
SEMS Research Laboratory
3M Center 235-3G-08
St. Paul, MN 55144
Re: Quasi-static crushing and displacement basedBC
One other thing to back up Dave's comment. Take a look at the magnitude of
the acceleration fields in that region. If those are non-zero then you
have forces still acting on it due to inertia. If that's the case, then
your part left the surface and is flying towards the bottom plate (out of
frame). You could probably go through the stress-equilibrium equations to
back out the elemental acceleration (typically a derived nodal value) and
determine the force in the elements. S(ij,j)=mAj. I frequently do this to
confirm if an input pulse in a dynamic simulation is being transmitted
correctly through the material.
What kind of interaction properties do you specify between the top platen
and the sample? Perhaps a cohesive bonding to the plate would help using
infinitely high debonding parameters.
> Presumably the momentum of the foam structure causes it to keep moving
> even after the indenter stops. How is the model constrained on the opposite
> side of the structure? Can you retrieve reaction forces there?
> Dave Lindeman
> Lead Research Specialist
> SEMS Research Laboratory
> 3M Center 235-3G-08
> St. Paul, MN 55144
> 651-733-6383 <(651)%20733-6383>
> From: [hidden email] [mailto:[hidden email]]
> Sent: Thursday, June 15, 2017 6:07 AM
> To: [hidden email] > Subject: [EXTERNAL] [Abaqus] Quasi-static crushing and displacement based
> Hello Dear Friends,
> I am doing explicit (with mass scaling) crushing analysis of porous media
> with small dimensions as 50 mm approx in all directions. Displacement BC
> with tabular data was given.
> And I read the reaction force from the impactor surface that is a rigid
> plate. I applied mass-scaling with caution; no problem on energy levels.
> However, I encountered loss of the surface contact between the rigid
> impactor and crushed material. Here:
> http://imgur.com/a/NKZU4 >
> Interestingly, crushing was continued but due to the loss of contact, I
> could not read the reaction force properly.
> Is there any advice on it?
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