non linear shell case

sofien_73

Hi everyone, I'm looking for tips to push a classic case of a shell which has it's four sides simply supported and submited to pressure to the collapsing. Non linear analysis is not enough to do this (equivalent plastic deformation over 12% is the higest limit for this kind of analysis with steel plate) maybe there's somebody who had made this kind of analysis with realistic failure criteria with openradioss.
Here the model for example.

BR

Fatmac

I was not quite sure ur model was simple supported on 4 sides, so i fiddled around with the BCs but then with QuasiStatic steps I got to some high plastic strains

disla

2 Simply supported isotropic plate under uniform load benchmark.
Page 4/53.

Authors. Biswajit Banerjee[1]
Jeremy Chen, Raj Das, Anjukan Kathirgamanathan

https://www.researchgate.net/publication/258848858_Comparison_of_ANSYS_elements_SHELL181_and_SOLSH190

Use symmetry BC and reduced integration S8R.



That is to start assuring the right BC and minimum number of elements.
Then you can switch to Plasticity (

sofien_73

Thanks to both of you, that's ok for BC and element type.
Disla, what is the next step the main objective is to evaluate failure pressure in accordance with real material curve which I don't have. Is it possible to use failure criteria with non linear analysis we can only simulate elastic and plastic domain I just watched for equivalent plastic strain but it goes higher than 100% which have no physical sens but it's ok because we don't have any failure criteria computed.