Dynamic simulation of a hyperelastic beam

1

Hi everyone,

I’m trying to conduct a dynamic simulation of a hyperelastic beam. We applied linear elastic material first successfully.
Then I tried to use hyper-elastic with *dynamic method, but failed. The deformation is very strange and the simulation diverses in the following time steps. The beam deformation is shown after the simulation.

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I use SI unit system in the simulation, the dimension of the beam is 0.13m0.01m0.01m.
If I change the unit from m to mm, with a beam size of 1301010, the simulation can be run successfully.
Anyone knows what is the reason and how to avoid it? I can only use SI unit system for some reason.

Thanks!

2

Maybe your SI(m) model has inconsistent units (for example material constants are wrong). Double check the correctness of all values.

Apart from that, can you attach a picture showing the undeformed mesh and possibly also boundary condition and load symbols ? This would help us verify the correctness of this model.

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3

As @Calc_em mentioned, check your units - that would be my first step.
Why can’t you just use mm-SI units?

4

Thanks! it seems the units used for the material parameters were wrong. I modified it and the problem is solved!

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