I have been working thru a few shell examples from this document
https://hub.hku.hk/bitstream/10722/54269/2/92945.pdf to get a better feel for the shell elements used in Calucix - particularly with non-linear analysis. I have set up a solid model as a control and have been playing around with different shell elements. With S4 elements the solution looks reasonable compared to the abaqus results presented in the paper

But, from what I understand, S4R elements were used in the study,

. When I try to use S4R the deflections are significantly less -perhaps I am not setting it up correctly?

any ideas
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