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Explicit: Elements fly away and give "Excessive Rotation" error message

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dfgsdfgfd

Mechanical
Sep 30, 2015
37
Hi all,

I'm running explicit simulations of a lattice structure with beam elements that deform significantly (i.e. 80% strain). Most of the time, the simulations run just fine. However, in some instances, I get the following error message before the simulation is finished.

***ERROR: Excessive rotation of node number
INSTANCE-DELAUNAYSTRUCTURE.438

***ERROR: Excessive rotation increment at one node

***ERROR: The fatal error will generate a new field output in the last
increment. All variables applicable to the current procedure and
material type(s) will be written to the output database.

When I track down the respective node, I can see that the linked element is "flying" away (see attached image). I tried to switch on element deletion (which should be on by default anyway) in combination with damage evolution, but it didn't help. The element actually doesn't seem to be deleted, despite its obvious detachment. Is that the problem or is it somewhere else?

How can I ignore this error message/element and prevent the calculations from stopping when this occurs?

Thanks very much to everyone!




 
 https://files.engineering.com/getfile.aspx?folder=ccfb5c1a-0f19-43d0-8829-37d142e0d146&file=element_438.png
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