# Multiple Shell Sections in one Model not working?

**URL:** <https://prepomax.discourse.group/t/multiple-shell-sections-in-one-model-not-working/1892>\
**Category:** General Questions\
**Tags:** material-definition\
**Created:** [July 22, 2024, 12:47pm UTC](https://prepomax.discourse.group/t/multiple-shell-sections-in-one-model-not-working/1892 "2024-07-22T12:47:54Z")\
**Posts on this page:** 1\
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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [July 22, 2024, 12:56pm UTC](https://prepomax.discourse.group/t/multiple-shell-sections-in-one-model-not-working/1892/2 "2024-07-22T12:56:35Z")

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> [@hnrwagner](#):
>
> in the first try I used only linear tri elements

I would avoid them in CalculiX - one such example: [Calculix vs Nastran big difference in results for shells - #22 by synt](https://prepomax.discourse.group/t/calculix-vs-nastran-big-difference-in-results-for-shells/1534/22)

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