Stress analysis and dynamc simulation

[dpac18]

Hello,

I'm in the process of desiging a lazy tong linkage and I'm  unconvinced that my stress analysis results are correct because I am having a few problems:

1) While trying to export leg members to FEA I receive the following message:

"Joint efforts applied to this part are not unique because the model is over constrained. Be careful with their interpretation."

2) I am also experiencing the center connecting member constraints showing up redunant.

Could either of these two problems have unwanted results on my stress analysis?

I have attached a simplictis version of the lazy tong linkage.

 

Thanks Dave

[AndrewSears]

Dave,

"Joint efforts applied to this part are not unique because the model is over constrained. Be careful with their interpretation."

Take a look at this link and see if it will answer your questions about being over constrained and redundant joints.  

http://beinginventive.typepad.com/being-inventive/2012/09/degrees-of-freedom-and-redundancies-calcul...

Andy