S4R elements

Fatmac

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

Fatmac

here is a picture of the set up, the papers results and the S4 element results