# Latest **URL:** https://calculix.discourse.group/latest.md [Latest](https://calculix.discourse.group/latest.md) · [Categories](https://calculix.discourse.group/categories.md) --- ## [CalculiX User Meeting 2026](https://calculix.discourse.group/t/calculix-user-meeting-2026/4099)
**Author:** [@Durbul](https://calculix.discourse.group/u/Durbul)\ **Replies:** 2\ **Last updated:** [September 14, 2026, 2:55pm UTC](https://calculix.discourse.group/t/calculix-user-meeting-2026/4099 "2026-09-14T14:55:30Z")
Dear CalculiX users, We are pleased to announce the first CalculiX User Meeting, hosted by MTU Aero Engines in Munich. The meeting is aimed at professional CalculiX users and has the following objectives: Learning ab… --- ## [Welcome to Discourse](https://calculix.discourse.group/t/welcome-to-discourse/7)
**Author:** [@system](https://calculix.discourse.group/u/system)\ **Replies:** 0\ **Last updated:** [July 28, 2020, 7:30am UTC](https://calculix.discourse.group/t/welcome-to-discourse/7 "2020-07-28T07:30:50Z")
CalculiX is a free Finite Element Program for thermomechanical applications. Using a Finite Element Code can be quite involved. In this community people discuss all problems related to obtaining a valid solution with the… --- ## [Abq2ccx input converter (Abaqus to CalculiX)](https://calculix.discourse.group/t/abq2ccx-input-converter-abaqus-to-calculix/4017)
**Author:** [@Stefano4000](https://calculix.discourse.group/u/Stefano4000)\ **Replies:** 8\ **Last updated:** [September 22, 2026, 12:08pm UTC](https://calculix.discourse.group/t/abq2ccx-input-converter-abaqus-to-calculix/4017 "2026-09-22T12:08:52Z")
abq2ccx is a tool to convert abaqus inp file into calculix inp file. So work is here greatly reduced to run abaqus inp files in calculix. Calculix 2.22 is here actual state with 141 cards. For chiefs here: Only 3 r… --- ## [Nonlinear Axial Compression (Buckling) of a Cylinder not Converging](https://calculix.discourse.group/t/nonlinear-axial-compression-buckling-of-a-cylinder-not-converging/4027)
**Author:** [@fethio](https://calculix.discourse.group/u/fethio)\ **Replies:** 94\ **Last updated:** [September 22, 2026, 8:19am UTC](https://calculix.discourse.group/t/nonlinear-axial-compression-buckling-of-a-cylinder-not-converging/4027 "2026-09-22T08:19:23Z")
Dear All, My and my student have been trying to run a nonlinear buckling analysis on a reactor skirt, basically a cylindrical shell with holes, under axial compression in CalculiX 2.23, but I am having convergence probl… --- ## [Orthotropic Shell/Plate Analysis](https://calculix.discourse.group/t/orthotropic-shell-plate-analysis/1086)
**Author:** [@Disla](https://calculix.discourse.group/u/Disla)\ **Replies:** 25\ **Last updated:** [September 20, 2026, 4:42pm UTC](https://calculix.discourse.group/t/orthotropic-shell-plate-analysis/1086 "2026-09-20T16:42:29Z")
Hello, I need some help. I’m working on the several examples described in the book “Mechanics of Laminated Composite Plates and Shells (JN. Reddy)” Basic input data (E1,E2, E3,G12,G13,G23,v12). E3 is conditioning th… --- ## [USER element : 1D beam custom implementation](https://calculix.discourse.group/t/user-element-1d-beam-custom-implementation/4079)
**Author:** [@p.viguier](https://calculix.discourse.group/u/p.viguier)\ **Replies:** 46\ **Last updated:** [September 19, 2026, 6:52am UTC](https://calculix.discourse.group/t/user-element-1d-beam-custom-implementation/4079 "2026-09-19T06:52:13Z")
Dear community, First a big thank to Guido Dhondt for such a beautiful software. I have been working recently to add a U1 user beam element with standard section. I ha seen that other user have started to work on thi… --- ## [Proposal for official building instructions](https://calculix.discourse.group/t/proposal-for-official-building-instructions/4104)
**Author:** [@gmb](https://calculix.discourse.group/u/gmb)\ **Replies:** 9\ **Last updated:** [September 15, 2026, 6:09pm UTC](https://calculix.discourse.group/t/proposal-for-official-building-instructions/4104 "2026-09-15T18:09:33Z")
Hi! Being a new CalculiX user is challenging. I spent some time on this forum to find a comprehensive tutorial on how to build CalculiX. Since the repository is opening to contributions I propose a BUILD.md file that ca… --- ## [Coupling constraints: capabilities and local coordinate systems not compatible](https://calculix.discourse.group/t/coupling-constraints-capabilities-and-local-coordinate-systems-not-compatible/4111)
**Author:** [@roy.roffler](https://calculix.discourse.group/u/roy.roffler)\ **Replies:** 1\ **Last updated:** [September 15, 2026, 1:14pm UTC](https://calculix.discourse.group/t/coupling-constraints-capabilities-and-local-coordinate-systems-not-compatible/4111 "2026-09-15T13:14:40Z")
I’m very new to CalculiX and so far, are only using it via PrePoMax. However, I do have experience with Ansys and NX Nastran. In both of these programs, you can apply loads or BCs on external points/nodes, which are coup… --- ## [Calculix equivalent to Ansys force bonded](https://calculix.discourse.group/t/calculix-equivalent-to-ansys-force-bonded/4108)
**Author:** [@linth](https://calculix.discourse.group/u/linth)\ **Replies:** 2\ **Last updated:** [September 15, 2026, 9:57am UTC](https://calculix.discourse.group/t/calculix-equivalent-to-ansys-force-bonded/4108 "2026-09-15T09:57:05Z")
Hi there, Ansys provides ways to treat contact different in a prestressed modal analysis in different ways: true status (e.g. if sliding in static, than only normal contact stiffness is used in the modal analysis, if … --- ## [CalculiX 2.23: undersized fnl array in resultsmech.f — load1 reproducer and candidate fix](https://calculix.discourse.group/t/calculix-2-23-undersized-fnl-array-in-resultsmech-f-load1-reproducer-and-candidate-fix/4106)
**Author:** [@estorm](https://calculix.discourse.group/u/estorm)\ **Replies:** 5\ **Last updated:** [September 14, 2026, 1:20am UTC](https://calculix.discourse.group/t/calculix-2-23-undersized-fnl-array-in-resultsmech-f-load1-reproducer-and-candidate-fix/4106 "2026-09-14T01:20:05Z")
We would appreciate maintainer review of a small source correction for a reproducible face-to-face contact failure in CalculiX 2.23. AI disclosure: ChatGPT Astra Ultra identified the defect, implemented the candidate fi… --- ## [Tie constraint on the edges of 2D elements](https://calculix.discourse.group/t/tie-constraint-on-the-edges-of-2d-elements/2855)
**Author:** [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Replies:** 11\ **Last updated:** [September 11, 2026, 1:05pm UTC](https://calculix.discourse.group/t/tie-constraint-on-the-edges-of-2d-elements/2855 "2026-09-11T13:05:26Z")
Hi, I know the manual claims that tie constraints only work with 3D elements but it’s not really the case in practice. At least with shell elements it works flawlessly (I’ve never encountered any issues). I thought ther… --- ## [Clearance Vs penetration](https://calculix.discourse.group/t/clearance-vs-penetration/4102)
**Author:** [@Disla](https://calculix.discourse.group/u/Disla)\ **Replies:** 16\ **Last updated:** [September 10, 2026, 7:28pm UTC](https://calculix.discourse.group/t/clearance-vs-penetration/4102 "2026-09-10T19:28:14Z")
Hello, Manual states: “The relative contact displacements constitute a vector with three components. The first component is the clearance (entity \[COPEN\]), i.e. the distance between the slave node and the master surface… --- ## [CalculiX ccx, cgx and zstd compression](https://calculix.discourse.group/t/calculix-ccx-cgx-and-zstd-compression/4101)
**Author:** [@rafal.brzegowy](https://calculix.discourse.group/u/rafal.brzegowy)\ **Replies:** 4\ **Last updated:** [September 10, 2026, 2:15pm UTC](https://calculix.discourse.group/t/calculix-ccx-cgx-and-zstd-compression/4101 "2026-09-10T14:15:24Z")
I’d like to propose adding native zstd (Zstandard) compression support to both ccx and cgx. Using standard gzip or uncompressed files can be slow or storage-heavy. Integrating zstd directly gives us much faster compress… --- ## [Calculix sometimes converging](https://calculix.discourse.group/t/calculix-sometimes-converging/4103)
**Author:** [@Mishal](https://calculix.discourse.group/u/Mishal)\ **Replies:** 1\ **Last updated:** [September 8, 2026, 9:20am UTC](https://calculix.discourse.group/t/calculix-sometimes-converging/4103 "2026-09-08T09:20:19Z")
Hi Guys Please refer to the link for the .inp file. The simulation presents a connection where one location has a slotted hole. I am applying a fairly low pretension of 8kN on the bolts over 3 seconds, there is then 2 … --- ## [Large Difference between Solution at Integration Points and Nodes](https://calculix.discourse.group/t/large-difference-between-solution-at-integration-points-and-nodes/4091)
**Author:** [@Yannick](https://calculix.discourse.group/u/Yannick)\ **Replies:** 4\ **Last updated:** [August 27, 2026, 9:30am UTC](https://calculix.discourse.group/t/large-difference-between-solution-at-integration-points-and-nodes/4091 "2026-08-27T09:30:38Z")
Hello everybody. we are using ccx to simulate centrifugal loads on a 3D body (multiple parts and materials, with contact). In order to see if we are doing it correctly we benchmark the solution against Ansys and we have… --- ## [Full precision output at nodes and integration points](https://calculix.discourse.group/t/full-precision-output-at-nodes-and-integration-points/126)
**Author:** [@benzwick](https://calculix.discourse.group/u/benzwick)\ **Replies:** 13\ **Last updated:** [August 24, 2026, 2:21pm UTC](https://calculix.discourse.group/t/full-precision-output-at-nodes-and-integration-points/126 "2026-08-24T14:21:27Z")
Is it possible to output the full precision (i.e. same values used inside CalculiX solver) displacement at nodes, stress at integration points and stress extrapolated to nodes, preferably in an easy to read format such a… --- ## [Statically linked version for linux](https://calculix.discourse.group/t/statically-linked-version-for-linux/4092)
**Author:** [@calc4fem](https://calculix.discourse.group/u/calc4fem)\ **Replies:** 1\ **Last updated:** [August 24, 2026, 9:29am UTC](https://calculix.discourse.group/t/statically-linked-version-for-linux/4092 "2026-08-24T09:29:39Z")
For some reason can’t compile the latest version of ccx2.23 and cannot run existing binary due to luck of libgfortran.so.4. Gfortran-7 also cannot be installed easily. Can someone share statically linked ccx? I have comp… --- ## [Pyramid elements C3D5 & C3D13](https://calculix.discourse.group/t/pyramid-elements-c3d5-c3d13/1881)
**Author:** [@fgr](https://calculix.discourse.group/u/fgr)\ **Replies:** 32\ **Last updated:** [August 23, 2026, 10:54am UTC](https://calculix.discourse.group/t/pyramid-elements-c3d5-c3d13/1881 "2026-08-23T10:54:52Z")
I have been fiddling with implementing pyramid elements into ccx\_2.21 so it would be nice if anybody would help with any kind of testing of the elements. So far it’s only pure mechanical functionality in some unknown lim… --- ## [2D-model with 1D-thermal network](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684)
**Author:** [@rafal.brzegowy](https://calculix.discourse.group/u/rafal.brzegowy)\ **Replies:** 6\ **Last updated:** [August 21, 2026, 6:20pm UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684 "2026-08-21T18:20:47Z")
Does anyone have an example (even the simplest one) of such a connection, such an analysis as the example below? Source: --- ## [Precice calculix adapter 2.20.2 available](https://calculix.discourse.group/t/precice-calculix-adapter-2-20-2-available/4088)
**Author:** [@Stefano4000](https://calculix.discourse.group/u/Stefano4000)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 2:39pm UTC](https://calculix.discourse.group/t/precice-calculix-adapter-2-20-2-available/4088 "2026-08-14T14:39:06Z")
The adapter supports calculix 2.20 with now less errors and limitations. Next step is support of newer calculix 2.23 or next calculix. --- ## [The Mohr-Coulomb constitutive model & linear surface-to-surface contact](https://calculix.discourse.group/t/the-mohr-coulomb-constitutive-model-linear-surface-to-surface-contact/4077)
**Author:** [@pzu4](https://calculix.discourse.group/u/pzu4)\ **Replies:** 17\ **Last updated:** [August 14, 2026, 1:42pm UTC](https://calculix.discourse.group/t/the-mohr-coulomb-constitutive-model-linear-surface-to-surface-contact/4077 "2026-08-14T13:42:59Z")
I have observed an unusual phenomenon: when the Mohr-Coulomb constitutive model is combined with linear surface-to-surface contact in CalculiX, the model fails to converge. After replacing the linear contact definition w… --- ## [How to compile Umat.f to dll file](https://calculix.discourse.group/t/how-to-compile-umat-f-to-dll-file/2310)
**Author:** [@liberty](https://calculix.discourse.group/u/liberty)\ **Replies:** 20\ **Last updated:** [August 13, 2026, 1:26pm UTC](https://calculix.discourse.group/t/how-to-compile-umat-f-to-dll-file/2310 "2026-08-13T13:26:38Z")
How to compile umat fortan code into a DLL file, using VS or Msy64 MinGw? I have been troubled by this problem for a long time. Where can I find a detailed tutorial. --- ## [Coupling constraints with shells](https://calculix.discourse.group/t/coupling-constraints-with-shells/4084)
**Author:** [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Replies:** 0\ **Last updated:** [August 10, 2026, 3:39pm UTC](https://calculix.discourse.group/t/coupling-constraints-with-shells/4084 "2026-08-10T15:39:37Z")
Hi, there seem to be some issues with coupling constraints attached to shells (and probably also other 1D/2D elements). Kinematic couplings (\*COUPLING followed by \*KINEMATIC) apparently require node-based surfaces, a… --- ## [Meet us at WCCM 2026 in Munich](https://calculix.discourse.group/t/meet-us-at-wccm-2026-in-munich/4007)
**Author:** [@Durbul](https://calculix.discourse.group/u/Durbul)\ **Replies:** 5\ **Last updated:** [July 31, 2026, 12:03pm UTC](https://calculix.discourse.group/t/meet-us-at-wccm-2026-in-munich/4007 "2026-07-31T12:03:35Z")
Dear CalculiX-Community, We will attend WCCM-ECCOMAS 2026 (19-24 July) in Munich. Our talk is on Wednesday at 3 p.m. and part of the Minisymposium „Open-Source Software in Mechanics“: We would be happy to meet up! --- ## [Soil-pipe interaction analysis](https://calculix.discourse.group/t/soil-pipe-interaction-analysis/4078)
**Author:** [@Juseche](https://calculix.discourse.group/u/Juseche)\ **Replies:** 2\ **Last updated:** [July 30, 2026, 10:26am UTC](https://calculix.discourse.group/t/soil-pipe-interaction-analysis/4078 "2026-07-30T10:26:42Z")
Hi! This is a model for soil-pipe interaction analysis. It is experiencing convergence issues; what is the best way to model this problem? The link to the INP file is as follows: Thanks in advance. --- ## [How to properly visualize contact elements in GraphiX?](https://calculix.discourse.group/t/how-to-properly-visualize-contact-elements-in-graphix/4076)
**Author:** [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Replies:** 5\ **Last updated:** [July 28, 2026, 10:33pm UTC](https://calculix.discourse.group/t/how-to-properly-visualize-contact-elements-in-graphix/4076 "2026-07-28T22:33:02Z")
Hi, I want to visualize contact elements in GraphiX. Here are the commands I enter: cgx\_glut ns\_3d.frd read ns\_3d.cel inp plot e all plot fb all plus er contactelements\_st1\_in1\_at1\_it2 view elem on As a result, I get … --- ## [\*RESTART for aeroelastic analysis](https://calculix.discourse.group/t/restart-for-aeroelastic-analysis/4075)
**Author:** [@yolk](https://calculix.discourse.group/u/yolk)\ **Replies:** 3\ **Last updated:** [July 26, 2026, 8:07am UTC](https://calculix.discourse.group/t/restart-for-aeroelastic-analysis/4075 "2026-07-26T08:07:48Z")
Hi all, I’m trying to set up a nonlinear optimization with CalculiX and a custom aerodynamic solver. In the optimization loop, because stiffness is dependent on deformation, I have to do the following loop: Run aero Ap… --- ## [Freecad 1.1 available](https://calculix.discourse.group/t/freecad-1-1-available/3845)
**Author:** [@Stefano4000](https://calculix.discourse.group/u/Stefano4000)\ **Replies:** 5\ **Last updated:** [July 25, 2026, 6:38pm UTC](https://calculix.discourse.group/t/freecad-1-1-available/3845 "2026-07-25T18:38:56Z")
with many improvements to calculix and Elmer. Binaries available today. Python 3.11 is here compiled. But significant features are planned in FEM Workbench. Do you need a calculix feature in freecad? not an issue… --- ## [Problem with creating surface by 'comp' command in CGX](https://calculix.discourse.group/t/problem-with-creating-surface-by-comp-command-in-cgx/116)
**Author:** [@W.H.Meng](https://calculix.discourse.group/u/W.H.Meng)\ **Replies:** 12\ **Last updated:** [July 25, 2026, 11:08am UTC](https://calculix.discourse.group/t/problem-with-creating-surface-by-comp-command-in-cgx/116 "2026-07-25T11:08:42Z")
Hi there, My intention was going to apply a 3D bolt pretension by a surface and a node. I partitioned a cylinder by a plane in Salome and made a face group of the interface ‘pret’ and a bottom face of cylinder ‘bot’. Th… --- ## [Tags associated with the issues.Github](https://calculix.discourse.group/t/tags-associated-with-the-issues-github/4070)
**Author:** [@Disla](https://calculix.discourse.group/u/Disla)\ **Replies:** 2\ **Last updated:** [July 22, 2026, 9:51am UTC](https://calculix.discourse.group/t/tags-associated-with-the-issues-github/4070 "2026-07-22T09:51:52Z")
Hello, ¿What do the different tags associated with the issues mean on the Github official webpage? In particular the “2.23” TAG. [Next page](https://calculix.discourse.group/latest.md?page=1)