Weird deformed shape after plasticity in compression of plate

[Rodrigo Benitez]

Hi everyone,

I'm simulating an experiment regarding compression of an orthotropic plate. The deformed shape looks right if I do a linear elastic analisis, but after applying plasticity (von mises), the deformation around the loaded area disappears. I'm attaching some images.

I'm applying CP command to couple Uz DOF of all nodes in the loaded area to the central node of this area, because the loading plate of the experiment was unable to twist.

Is this normal? I'm replicating another author's simulation, and his deformed shape (with plasticity) looks like the one on the left of the above picture.

Any help will be much appreciated.

 

[apwang]

With plastic material, the deformation tends to be localized, especially when the hardening part of the plastic material is very soft.
Consider case 1, use one hand to push a rubber material; case 2, use one hand to push a soil-like material. For case 2, the deformation will be more localized, meaning that only the area very close to the hand shape is deformed.

 

[Rodrigo Benitez]

Hi apwang, thank you very much for your response and explanation.

A friend of mine also explained something similar to me about this topic. The thing is that I got surprised for having this deforme shape as I'm replicating another author's simulation (that also used plasticity but another type different than me) and got this deformed shape: