Large deformation component

Hi all,

I read the manual but I still don't understand exactly how the large deformation component works. why at the end of the iterations it clears all the stresses inside the beams?

Probably what it lacks to me is a deep knowledge of non-linear anlysis...can someone guide me to some paper or book where i can understand better this kind of analysis?

Thx!!

Francesco

Replies to This Discussion

Permalink Reply by Leonardo on October 10, 2013 at 1:25am

Hi Francesco,

Just a question about "LaDeform" component: please could you explain me the use of "max disp" input data? I do not understand the words of the manual.

Thanks,

Leonardo

Permalink Reply by Francesco Ranaudo on October 11, 2013 at 1:49am

Hi Leonardo,

You are right, the manual is not so clear! So, I don’t know if what I am going to write is correct but this is my idea about this problem.

The “LaDeform” component runs a non-linear analysis by applying the loads on the deformed shape. This is done by steps or, in other words, in each step karamba applies a portion of the loads, computes the deformation and on this new configuration applies another portion of the loads and so on.

Now focus on what “portion” means.

One way of “portioning” the loads is to divide them in n parts (whit n= number of steps) and then applying in each step one part. For example, if you set 10 increments, in the first step the system will be loaded with the 10% of the loads, in the second with the 20% and so on. (I really don’t know if this is a linear proportion or not, but the concept is the same: a numerical division of the total loads).

Another way is to take that part of the loads that produces a fixed displacement. You know that F=ku: k is a property of the system, so it is fixed; setting the MaxDisp input you can compute u=Maxdisp/inc; so you can get F.

As I said before I am not sure of what I have written.

Tell me what you think!

Francesco

Permalink Reply by Leonardo on October 11, 2013 at 2:14am

Dear Francesco,

thanks for your reply. I totally agree with your description!

I think that the operating principles of LaDeform-component are clear.

I do not understand "MaxDisp" input value: where can you find this displacement in your model?

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