Negetive Eign Value
Negetive Eign Value
(OP)
My beam model worked fine for a small load. However, whenever I was trying to give a large load, its giving me an warning massege "2 negative eign values" and followed by an error message. I am sure the load is not too much for the model. Any one have any idea whats going on and how I can avoid that problem.





RE: Negetive Eign Value
RE: Negetive Eign Value
Or you would like to try using stabilization in the step to check is if there is an error in the model such as material.
RE: Negetive Eign Value
What is the error message that you get?
Regards
Martin
RE: Negetive Eign Value
RE: Negetive Eign Value
Yes, I Set Nlgeom to on.I think that is why the beam is distorting too much.
RE: Negetive Eign Value
And turning The NLGEOM On is a must in large deformation analysis in order to get the correct result.
RE: Negetive Eign Value
Regards
Martin
RE: Negetive Eign Value
try adding *controls after your *step. It helps with my solution sometimes.
*Controls, parameters=field, field=displacement
, 100.0
RE: Negetive Eign Value