# Open source FEM – shell calculations

**URL:** <https://prepomax.discourse.group/t/open-source-fem-shell-calculations/1048>\
**Category:** Tips & Tricks\
**Created:** [August 27, 2023, 8:27pm UTC](https://prepomax.discourse.group/t/open-source-fem-shell-calculations/1048 "2023-08-27T20:27:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\
**Post date:** [August 27, 2023, 8:27pm UTC](https://prepomax.discourse.group/t/open-source-fem-shell-calculations/1048/1 "2023-08-27T20:27:58Z")

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Found this post on the net which I think is not properly solved.  
It is based on NAFEMS LE3: HEMISPHERICAL SHELL linear elastic benchmark.

> **[Open source FEM - shell calculations - FEA4free](https://fea4free.com/open-source-fem-shell-calculations/)**
>
> In this article I want to check this, "Are open source programs (Code Aster and Calculix) suitable for shell calculations?"

Prepomax result is 185.1mm compared to expected result 185mm.

 ![imagen](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/9/95887ab5612298c5f5db09eb5eaaa2c300151e12.jpeg)

[HEMISPHERICAL SHELL WITH POINT LOADS.pmx](https://prepomax.discourse.group/uploads/short-url/vkXrtmnmnPdyBVkkYnB6eeFh8z2.pmx) (1.5 MB)

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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:** [August 27, 2023, 10:10pm UTC](https://prepomax.discourse.group/t/open-source-fem-shell-calculations/1048/2 "2023-08-27T22:10:50Z")

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Apparently the same benchmark is discussed here: [Model definition — CoFEA Initiative](https://cofea.readthedocs.io/en/latest/benchmarks/005-hemispherical-shell-point-load/model.html)