Just as a follow up I decided to try out FEMAP with NX Nastran. It allows you to install a 300 node limted demo, which should be OK for me to play around creating simple models as described above and run some analysis. Thanks for all advice.
Yes thats what I was hoping to do. I've gone through bar and beam elements and have a reasonable grip on 3D Space Frame type analysis, and the componentns of the stiffness matrix for such problems. However Im moving on to 2D and 3D problems and the learning curves seems steep to me.
Thanks for...
I will look into CalculiX.
Bear in mind I am just trying to get as much backround learning now before going on the course, after which hopefully I will have a better understanding. Then perhaps after that I can go into more depth and look into how this method is used in industry.
I plan to attend the NAFEMS Practical FE course in March. Does anyone know if its any good?
I'm a beginner with some experience but I really want to understand the basics of FE and not just how to use a piece of software (ie Femap Patran etc). I have a few books which have helped get me...
kellnerp thanks for answer but what about the fact that derivation of vM assumes that the total strain energy is area under stress/strain curve that is proportional? the derivation following (Total Strain Energy - Hydrostatic Strain Energy) = Distortion Strain Energy. Thats is the only issue I...
Hmm...Im still not seeing the applicability to ultimate failure. What does vMises physically mean when you are near fracture (to me failure = fracture, perhaops im not being clearer).
Regardles, I found interesting discusion here.
http://www.eng-tips.com/viewthread.cfm?qid=171174
thread727-148480
Can someone explain the logic of using Von Mises for static failure (i.e. ultimate)? I thought it was only really useful for determining if yielding has occured. Once you get close to failure you're in the non-linear portion of the stress/strain curve, so is Von Mises still...
dominat is largest magnitude principal stress? So for if a spectrum the dominant principal stress at node are 0,-10,0,25,65,0,-82,50,70,0 (10 cases) the vectors could all be different?
I think I know how to rainflow to find the reversals, and add the damages together for each pair, but as above...
Thanks, however I was more concernd with the use of Principal streses.
I may also looked at a number of cases, like maybe 10 instead of just 2. That is, my spectrum might contain 10 different load case. I guess I would need to just use Principal stresses becasue taking the difference might be...
thread727-156008
forgive my english, regarding using principal streses for fatigue analysis.
If I have two FE cases, and suppose FEA based fatigue analysis will be caried out by cycling between these two cases.
How would principal stresses be used? Does it matter that the principal vectors...
