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Static test for rubber model in LS DYNA

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Posts: 3
Topic starter
New Member
Joined: 6 years ago

Im a beginner in the implicit world and looking for any advise about the implicit setup.
I am trying to perform a static load analysis on a rubber part using the material model *MAT_HYPERELASTIC_RUBBER but I am running into failed to find equuilibrium error very often...
I am using Hex elements and have tried element formulations -1 and -2 as recommended by a source from Dynamore. (link - [url] [/url])

The loading rate is 10mm/min and the test is for 3 minutes. So Ive given DTMAX = 180 (seconds), DTMIN = 0.001 and DT0 = 0.1. But not getting the equilibrium. Is this the wrong way?

Further, I came across another source which says that the LS DYNA implicit functionality is not available for *MAT_077. Is this true? In that case, how do we perform the static case?
(Link - [url] [/url])

Thanks in advance.

Best Regards,

1 Reply
Posts: 3998
Joined: 5 years ago

If you are experiencing convergence problems then my first guess would be that your material model may have an inappropriate set of material parameters. I usually use the [URL= ]MCalibration[/URL] software to calibrate those types of LS-DYNA material models. MCalibration make it easy to ensure that the material model is stable.


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