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http://impact.sourceforge.net/ This is not Linux, but quite cool with an explicit solver written in Java...

Sorry, the article can be found under Technical notes--> Nastran on the www.6dof.com page.

Hi, goto www.6dof.com and get yourself a user id. On the downloads page for Nastran there's a great article free to download that answers your question. It's called "The undocumented RBE3". I do not want to post the article here as I don't know if its allowed. /Cpt Kirk

Kotawsu, you can just define soft springs in a manner that your model will not be singular, i.e. so that tou will have stiffness in all directions. Where you put your springs does not matter as they are soft in order not to disturb your analysis. /Nodepicker

Hi, I have tested Patran, I-deas, Hypermesh, Ansa and a little Femap. In my opinion Ansa is by far the best mesher apart from when you mesh a lot of solid models. Shell meshing is the strongest part in Ansa. If you have used Ansa, you don't want to use anything else. It is the only program I've...

Strange enough, as far as I know there are no documentation about the punch format. At least thats what they told me at their support. I suggest you use the print command and send your data to the .f06 file. When you have done that, then you can identify the punch format by comparing numbers...

I usually use the element stress for the reasons as stated earlier in this thread. One has to be careful with the use of averaged nodal stresses. If there are varying thicknesses of shells connected to an averaged node, then it is not appropriate to talk about an averaged stress in the node. The...