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Benchmark Pro Mech with Theory help pleas

M

msiva1981

Member
Hi,
Iam a fairly new user to Pro Mechanica though i have been using Pro E for quite sometime now. I am trying to optimize some structural steel shapes using Pro Mechanica. As a first step i want to benchmark my model.
I take a cantilever beam apply loads ( i use a small program called MDSOLIDS and it gives me the theorotical results). I know that the deflections are my benchmark.
I do the same with Pro Mechanica but my deflections are way off. I have attached two files which show the scenario. I have a deadline approaching. So any help on this would be immensly appreciated
Theorotical deflection 0.03 inches
Deflection from Mechanica 0.8456e-05
I have attached a file with two images for someone to help me

Thanks
Siva


2007-09-29_064410_Pro_Mechanica_siva.zip
 
An optimised model such as a cantiliver I beam would ideally be consistently stressed along its length. For a given stress, sigma_y you could obtain the I value and then use this I value to determine the cross section of the beam as a function of 'x' from the constraint of the wall. The beam would be deeper in section at the wall than at its end, where the minimum moment occurs.


Don't forget that direct stress needs to be considered along with the bending stresses when looking at the maximum allowable stress.


I can't stress enough how important it is how you constrain your model when running an analysis. Is it simply supported or built in ora mixture of the two? If your derived theory is correct (and it should be!) then I would presume you have gone wrong somewhere in your analysis. Have you constrained it properly? Are your units consistent and set correctly? If appying a load over area for a total load, have you carried out the correct multiplication / division for the calculated area?


These are just some points to consider.


If you give me details, I will run an analysis for you. Private message me for my e-mail.


Phil
 
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