https://github.com/jfriedlein/ushl_ls-dyna_fortran
Basics to implement user-defined shell elements (ushl, uel) in LS-Dyna with Fortran
https://github.com/jfriedlein/ushl_ls-dyna_fortran
axisymmetry documentation element element-formulation fortran90 ls-dyna plane-strain resultant-element tutorial uel user-defined-element user-element ushl
Last synced: about 2 months ago
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Basics to implement user-defined shell elements (ushl, uel) in LS-Dyna with Fortran
- Host: GitHub
- URL: https://github.com/jfriedlein/ushl_ls-dyna_fortran
- Owner: jfriedlein
- Created: 2024-04-30T06:43:30.000Z (12 months ago)
- Default Branch: main
- Last Pushed: 2024-12-19T07:54:30.000Z (4 months ago)
- Last Synced: 2025-01-11T23:44:19.865Z (3 months ago)
- Topics: axisymmetry, documentation, element, element-formulation, fortran90, ls-dyna, plane-strain, resultant-element, tutorial, uel, user-defined-element, user-element, ushl
- Language: C++
- Homepage:
- Size: 152 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# ushl_LS-Dyna_Fortran
Basics to implement user-defined shell elements (ushl, uel) in LS-Dyna with Fortran
Focus here is on 2D elements for plane strain and axisymmetry, not on actual shell elements
## Generalised interface for use of separate element subroutines for 2D plane strain and axisymmetry
If you use a separate subroutine (e.g. a function that computes the force vector and stiffness matrix based on the displacement vector) for the element formulation or e.g. AceGen to generate the element routine, I can recommend the general interface stated in "ushl_e101_generalInterface.f".
## Numerical examples
The folder "numericalExamples_LS-Dyna" contains examples to test user-shell elements for plane strain and axisymmetry.
The folder "userLoading_LS-Dyna" contains the modified subroutine loadud to apply constant pressure on an edge of a shell element to enable plane strain or axisymmetric pressure loading of user-shell elements.
## todo
- "UEL_helper_Fortran_LS-Dyna" is included as submodule in git, but is therefore not downloaded when using "Code"->"Download ZIP". This is a common (and annoying) limitation/bug in git (status 2024). Please manually download the submodule or clone the entire repo (including submodules)
- function "isNan(*)" is only available for ifort compiler, e.g. not for pgi. Maybe use ( a /= 1 ) or ( a == NaN )?