non-linear analysis

[petrelli9]

Hello, guys, would anyone tell me how to make ansys the phenomenon of "densification"? in practice it is a test in "lattice" structure subjected to a simple compression test. I managed to get to the plastic section (dark blue curve), but I can't make the piece "break" and then have a trend like what I looked for in green in the image. advice?

 

[meccanicamg]

Forgive me but I struggle to believe that ansys and whatever fem can return a graph made equal to that of a hydraulic galdabini.

a fem can give results according to a definite curve of the material. the curve of the material usually starts with a row of the elastic field. then a second stretch plastic elasto. the phenomenon of strition and oscillating load only see it with iron but normally in the fem are only two linear traits. for this is called bi-linear. possibly tri-linear.

If at a fem insert the true curve of a lab test you will have for equal stretching more voltage values....so what will choose the fem?

I think you want to get more than what the fem can do.

Maybe I'm wrong, but I think it's kind of like that.

 

[Onda]

We are talking about a latex print structure 3d under compression load.
In practice, you should have elastic deformation, then plastic, then yielding and packing (filling the lattice structure blanks), and then further plastic deformation.
I think it is quite challenging as a fem solution, you have to set up a solution with great deformations, contacts with the body itself, and I suppose it also has to do the remesh, as the deformed is too big to maintain the correct elements. with these settings you should fix. if you do not have contacts with the body itself you do not have the effect of increase of rigidity when you complete the packing

 

[petrelli9]

We are talking about a latex print structure 3d under compression load.
In practice, you should have elastic deformation, then plastic, then yielding and packing (filling the lattice structure blanks), and then further plastic deformation.
I think it is quite challenging as a fem solution, you have to set up a solution with great deformations, contacts with the body itself, and I suppose it also has to do the remesh, as the deformed is too big to maintain the correct elements. with these settings you should fix. if you do not have contacts with the body itself you do not have the effect of increase of rigidity when you complete the packing

Finally someone who understood. thank you so much for the answer, I wanted to ask you how do I set the contact between the body itself and the remesh? I've already set the big deformations. Thank you very much

 

[Onda]

I'm sorry. I use nastran and marc for big deformations. Not ansys. the concepts are the same. no commands.
If I understood correctly you should go to see a plastic deformation simulation pushed with the remesh and add the self-contact.