question about rotation spring

pimkkk · Post by **pimkkk** » Mon Jul 19, 2010 11:05 am

Hi, i have a question about rotation spring, can it be used in 3D model? thanks

vesna · Post by **vesna** » Mon Jul 19, 2010 4:29 pm

Yes, it can be used.

pimkkk · Post by **pimkkk** » Wed Jul 21, 2010 10:59 pm

thanks for the reply, but when i tried to change my fixed boundry condition to a rotation spring, i got an error says analyze failed, returned -3error flag.
i basically added another node which has the same location as the node where i wanna have the spring, and i added a zerolengh element, using " uniaxialMaterial Elastic $ShearmatTag [expr $G*1];"
i really dont know how i can fix this error right now, i was like tried everything already, please help me with that.

thank you so much!

nitadorakis · Post by **nitadorakis** » Fri Aug 20, 2010 8:54 am

Hi pimkkk

I also want to use a rotational spring in a 3D model.
The zerolength element approach seems ok.
Have you solved the issue?

pimkkk · Post by **pimkkk** » Fri Aug 20, 2010 10:10 am

no, it stiill doesnt work for my model, the results(deformation) i got from the sping model are the same as the fixed end model.

do you know why i got this problem?

Thank you very much~

nitadorakis · Post by **nitadorakis** » Fri Aug 20, 2010 12:45 pm

Check that only one end of the zerolength element is fixed or maybe use a different value for the uniaxial material....
I can't think of something else now!