[FEM] More than 3 yield points in FEM_MaterialMechanicalNonlinear

[FreeCAD-Bug-Importer]

Issue imported from https://tracker.freecad.org/view.php?id=4720

• Reporter: @FEA-eng
• Date submitted: 8/6/2021
• FreeCAD version:
• Category: Feature
• Status: assigned
• Tags: FEM, material

Original report text

Currently only 3 yield points can be defined in FEM_MaterialMechanicalNonlinear (plasticity definition). It should be fairly simple to add a possibility to define more points so that a full stress-strain curve can be approximated. Ideally, there should be no limitation on the number of yield points at all. But if a limit can't be avoided due to coding issues then let's increase it significantly.

Forum thread: https://forum.freecadweb.org/viewtopic.php?f=18&t=57382

Previous forum thread with the discussion about this limitation: https://forum.freecadweb.org/viewtopic.php?f=18&t=51756

FreeCAD Info

OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24276 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: a88db11e0a908f6e38f92bfc5187b13ebe470438
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: Polish/Poland (pl_PL)

Other bug information

• Priority: normal
• Severity: feature
• Category: Feature
• Updated: 8/6/2021

Discussion from Mantis ticket

Comment by @luzpaz 2021-08-06 20:43

NewJoker thanks. BTW, if you're using FEM, please make sure to use the dev version as opposed to what you reported using in this ticket 'Version: 0.19.24276 (Git)' since FEM development progresses in bursts and changes are rarely backported.

[FEA-eng]

This issue can be closed since #5024 resolved it. @luzpaz Could you close it?