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Explicit Dynamic model

Explicit Dynamic model

Explicit Dynamic model

(OP)
I am running a dynamic model, but I obtain the following error when I apply a concerntrated load on a node, however I am obtaining the following error message:

The ratio of deformation speed to wave speed exceeds 1.000 in at least one element. I assume this element is related to the node I am applying the concerntrated load to.

When I apply a displacement to a number of nodes, this problem does not occur.

Does anyone have any suggestions on how to get around this? Thanks.

RE: Explicit Dynamic model

(OP)
Any input would be much appreciated, thanks.

RE: Explicit Dynamic model

Point loading is generally a bad idea because of errors like this.  That being said if you ramp the load it should probably converge better.  I usually would model the indentor and apply a displacement load to the far side of the indentor.  I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

RE: Explicit Dynamic model

(OP)
Thanks Rob,

"I usually would model the indentor and apply a displacement load to the far side of the indentor"

Could you please expand a little on this, I am not sure what you mean by this. Thanks.

RE: Explicit Dynamic model

Model the indentor with solid elements.  Apply a displacement to the back surface of the indentor.  Basically move the constraint assumptions away from the area of interest.  I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

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