set a tree with traction-flying-torsion,principle help

[meccanicamg]

View attachment 57427

see... it hasn't changed much though if you see... even in my...the maximum value is some mesh dot but the average realistic one would be the orange....so if you try to halve the mesh on the ray you will get many more orange dots that will make the average reliable trend.

 

[bulfy98]

Hello, here's a rectangular one. as you see the traction result does not distance much from the previous case with mesh tetraedrica and however taller than that calculated by hand 289.

 

[bulfy98]

probably the speech is that in proportion the connection radius is small and in the curves is in the area where it tends to go to infinite the kt and probably there are difficulties of convergence. Therefore the type of mesh, shape and element, size and algorithm of convergence could give different results.
If you can do the test with rectangular mesh.
I would instead try not to use elements of the second order but of the first order and see if the tensions are lowered. in my practical experience I have seen that the first order despite rougher and rigid often approaches practical feedback.

I noticed this orange area, it is also present in case with tetrahedra. So do you recommend using an average voltage there? Do you have any idea how to calculate it?
I'm starting to lose some confidence, maybe I should get this overestimated result and peace. However, I fear that something is wrong in the setting, and this is confusing to me, especially because it is the first time I use this program and the prof is not providing me with great help on this.

 

[meccanicamg]

I noticed this orange area, it is also present in case with tetrahedra. So do you recommend using an average voltage there? Do you have any idea how to calculate it?
I'm starting to lose some confidence, maybe I should get this overestimated result and peace. However, I fear that something is wrong in the setting, and this is confusing to me, especially because it is the first time I use this program and the prof is not providing me with great help on this.

In the end you have to experiment. evolved programs have the ability to calculate the weighed average by clicking on the area of interest (the connection) and this ease very much.
if you further intensify the fineness of mesh and the value remains that there is nothing to do...it is high and that is. but it is to try.

 

[bulfy98]

hi, I continued and completed the calculation cases that prof had assigned me.
Wednesday I would have a skype synchron with her where to show her everything.
I wanted to share the results, in particular I would be attentive to the overlapped double cut cable (key seat and shoulder).
I attach the semi-complete power point. for each tree type the slides are in the sequence: traction, flux, twist.
at the beginning I have placed a summary table of everything with, where present, the counterent between analytical case and fem. are there some cases where the difference is a lot, ideas about it?
thank you very much for the attention
Good evening

 

[bulfy98]

I keep going. . .

 

[meccanicamg]

the calculated voltage due to the combination of the two carvings obviously not being theoretical treatment, when twisting you have a behavior of unflattering stress and tensions that make it inapplicable von mises.
There are probably factors that influence the intensification of efforts because they.... there is little meat cn too much stress and probably the fact of linear analysis is no longer valid. the matrix rigidity could be incorrect in the linear field.

Surely something strange happens.
It would be interesting to understand what the prof tells you.

 

[bulfy98]

the calculated voltage due to the combination of the two carvings obviously not being theoretical treatment, when twisting you have a behavior of unflattering stress and tensions that make it inapplicable von mises.
There are probably factors that influence the intensification of efforts because they.... there is little meat cn too much stress and probably the fact of linear analysis is no longer valid. the matrix rigidity could be incorrect in the linear field.

Surely something strange happens.
It would be interesting to understand what the prof tells you.

Thank you very much. know about the material (also theoretical) where these topics are?
I would like to try to give some conclusions on this by interpreting the values of my little work.

 

[meccanicamg]

Thank you very much. know about the material (also theoretical) where these topics are?
I would like to try to give some conclusions on this by interpreting the values of my little work.

Unfortunately not. are discussions made in various contexts with different professionals. . ..written there is very little... or nothing.

 

[Bonny23]

Sorry, maybe I missed it by reading the discussion, but what are the characteristics of the material used for trees?

 

[meccanicamg]

In fact, the type of material is not written but is definitely a steel with ductile behaviour.
Actually it does not need to know whether it is s275 or c45 or 42crmo4.