tlcfem/suanpan

🧮 An Open Source, Parallel and Heterogeneous Finite Element Analysis Framework

suanpan's Issues

[BUG] Loads and constraints cannot be enabled/disabled during analysis

[BUG] Wrong tangent stiffness in K4 material

Duncan-Selig hyperbolic soil model

Feature
Hello, excited about trying out this library for structural analysis.

The geotechnical analysis capability is great, but it is limited by the number of soil models. A great addition would be the Duncan-Selig hyperbolic soil model (modified somewhat recently by Katona, to take into account residual deformation during unloading).

The Duncan-Selig model is the gold standard for analysis of structural problems in which soil is the dominant load carrying component in a soil-structure system, such as in buried flexible culverts. In fact the AASHTO LRFD design code requires FEA to be performed for some classes of buried culverts, such as corrugated metal structures with deep corrugations. The only free FEA program available for this kind of FEA using the Duncan-Selig model is CANDE, and although it is still being actively updated, it is not open source and long periods of time pass between updates. It is also 2D only, the preprocessor and postprocessor are woefully out of date, and it is just dad-blamed tough to use. A more modern open source option like suanPan would be most welcome by the geotechnical engineering community.

References
Modified Duncan-Selig model by Katona

Document about case file format

Hi,

Just wondering where is the document located, so I can prepare a case file.

I have run one case. How do I get an VTK output?

Cheers,

Cean

[BUG] Undefiend behaviour when command is empty

[BUG] Memory leak in SuperLU mixed precision solving

[BUG] Segmentation fault with concurrent expression evaluation

[BUG] .load() raises error when loading plain text file

[BUG] Unintentionally set solver from subsequent steps

For

step static 1 1
step dynamic 2 6
solver LBFGS 1 20

Step 1 will try to use the LBFGS solver defined in step 2.

A warning will be issued if the solver is incompatible.

[BUG] `NodeLine` constraint is always activated

[BUG] Incorrect displacement components from support motion like loads