Explicit Dynamic model

[yaston4]

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.

 

[yaston4]

Any input would be much appreciated, thanks.

 

[rstupplebeen]

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/

 

[yaston4]

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.

 

[rstupplebeen]

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/