# Square hollow section chassis

**URL:** https://calculix.discourse.group/t/square-hollow-section-chassis/1246
**Category:** Uncategorized
**Created:** [September 4, 2022, 10:12pm UTC](https://calculix.discourse.group/t/square-hollow-section-chassis/1246 "2022-09-04T22:12:34Z")
**Posts on this page:** 1
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### Author: ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)
#### Post date: [September 5, 2022, 8:18pm UTC](https://calculix.discourse.group/t/square-hollow-section-chassis/1246/21 "2022-09-05T20:18:28Z")

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There can be also surprisingly large inaccuracy when fully integrated beam elements are used with plasticity and when the mesh of beam elements is not significantly refined:

> [@Elasto-plastic bending - elements, accuracy](https://calculix.discourse.group/t/elasto-plastic-bending-elements-accuracy/700):
>
> Hi, I am currently working on the following scenario - a cantilever beam (rectangular section) meshed with solid elements subjected to a concentrated force at the free end. Bending occurs in the elasto-plastic regime (elastic perfectly-plastic material model). My goal is to obtain the deflection as close to the analytical one as possible using solid elements. Here are the current outcomes: analytical solution: 23,625 mm beam elements in Abaqus (40 x B22): 23,69 mm solid elements in Abaqus (70…

[https://forum.freecadweb.org/viewtopic.php?f=18&t=27903](https://forum.freecadweb.org/viewtopic.php?f=18&t=27903)  
[https://forum.freecadweb.org/viewtopic.php?f=18&t=23318&p=521544#p521544](https://forum.freecadweb.org/viewtopic.php?f=18&t=23318&p=521544#p521544)

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