Foam compression 1m/s , problem at 50% of deformation , foam go throught impactor
Hi !
I try to simulate a foam compression at a constant speed of 1 m/s. Before I have realised the same compression experimentally. In order to compare simulation and experimental.
I block every movement on bottom of foam and I imposed a constant velocity to impactor.
To go to approximatively 50% of strain there is no problem, simulation and experimental are the same.
But after Simulation disgress from experiemental.
I use brick elements of 1x0.5x0.5cm.
Anyone have an idea to solve this problem
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Answers
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Hi,
the issue is because the interface 'impacteur vs foam' had dtmin=0.6 If the time step of a slave node in this contact becomes less than dtmin, the slave node is deleted from the contact and a warning message is printed in the output file. This dtmin value takes precedence over any model interface minimum time step entered in /DT/INTER/DEL. Because dtmin is quite high, a lot of nodes are deativated from the interface, therefore penetrating the plate.
The recommended solid property parameters for material law 70:
If there is hourglassing, use Isolid=17, however your model runs fine with the above.
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