# Uncategorized **URL:** https://calculix.discourse.group/c/uncategorized/1.md [Latest](https://calculix.discourse.group/latest.md) · [Categories](https://calculix.discourse.group/categories.md) --- ## [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… --- ## [CalculiX 2.23 binaries for Windows 11 x64](https://calculix.discourse.group/t/calculix-2-23-binaries-for-windows-11-x64/4196)
**Author:** [@mkhan](https://calculix.discourse.group/u/mkhan)\ **Replies:** 0\ **Last updated:** [October 19, 2026, 7:29pm UTC](https://calculix.discourse.group/t/calculix-2-23-binaries-for-windows-11-x64/4196 "2026-10-19T19:29:15Z")
Dear colleagues! Here the binaries for CalculiX 2.23 with the required dlls to run every ccx variant in the calculix\_2.23\_4win.zip package on the CalculiX Homepage. https://github.com/mkhan138/calculix-fea-examples/rel… --- ## [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… --- ## [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… --- ## [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… --- ## [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. --- ## [Pretension shear/tensile resistance](https://calculix.discourse.group/t/pretension-shear-tensile-resistance/2091)
**Author:** [@Disla](https://calculix.discourse.group/u/Disla)\ **Replies:** 39\ **Last updated:** [June 12, 2026, 6:51am UTC](https://calculix.discourse.group/t/pretension-shear-tensile-resistance/2091 "2026-06-12T06:51:25Z")
Hi, I’m testing other user approach of bolting. I have certainly pushed hard the test as it has shown to be very stable in terms of convergence. What I have notice is that as soon as I activate the pretension section (… --- ## [\*ERROR in u\_calloc: error allocating memory variable=sideload](https://calculix.discourse.group/t/error-in-u-calloc-error-allocating-memory-variable-sideload/881)
**Author:** [@CRossmann](https://calculix.discourse.group/u/CRossmann)\ **Replies:** 20\ **Last updated:** [March 19, 2026, 5:48pm UTC](https://calculix.discourse.group/t/error-in-u-calloc-error-allocating-memory-variable-sideload/881 "2026-03-19T17:48:07Z")
Hello, I am running into issues with memory allocations for the sideload array in ccx\_2.1x.c. I have a thermal model with a mesh that contains about 160k elements with lots of surfaces for consideration of radiation and… --- ## [About UNCOUPLED TEMPERATURE-DISPLACEMENT](https://calculix.discourse.group/t/about-uncoupled-temperature-displacement/3786)
**Author:** [@tommow](https://calculix.discourse.group/u/tommow)\ **Replies:** 4\ **Last updated:** [February 14, 2026, 1:43am UTC](https://calculix.discourse.group/t/about-uncoupled-temperature-displacement/3786 "2026-02-14T01:43:29Z")
Hi. I’m looking to implement UNCOUPLED TEMPERATURE-DISPLACEMENT, but my specific use case requires a static structural analysis. Does CalculiX support a combined mode for statics and transient heat transfer? I’ve heard … --- ## [Buckling of sphere](https://calculix.discourse.group/t/buckling-of-sphere/2774)
**Author:** [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\ **Replies:** 32\ **Last updated:** [July 28, 2025, 7:26pm UTC](https://calculix.discourse.group/t/buckling-of-sphere/2774 "2025-07-28T19:26:11Z")
Hello, is it possible to get the buckling mode of a spherical shell? I have tried with a half of a perfect spherical shell, with uniform pressure, but i dont’ get it work. wbr dichtstoff --- ## [Modelling variable stiffness composites](https://calculix.discourse.group/t/modelling-variable-stiffness-composites/1505)
**Author:** [@OliviaS](https://calculix.discourse.group/u/OliviaS)\ **Replies:** 6\ **Last updated:** [July 22, 2025, 8:24am UTC](https://calculix.discourse.group/t/modelling-variable-stiffness-composites/1505 "2025-07-22T08:24:05Z")
Hi all, I would like to share a simple python script that I recently wrote to model a variable stiffness / steered fibre composite panel in compression with CalculiX - in case this is of interest to the community. I wo… --- ## [Buckling cylindrical shell axial with shell elements](https://calculix.discourse.group/t/buckling-cylindrical-shell-axial-with-shell-elements/2813)
**Author:** [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\ **Replies:** 0\ **Last updated:** [July 21, 2025, 7:26pm UTC](https://calculix.discourse.group/t/buckling-cylindrical-shell-axial-with-shell-elements/2813 "2025-07-21T19:26:59Z")
hello, i made an example for buckling of cylindrical shell under axial compression with S8 shell elements. For boundary i need to add spring elements. if someone has a better solution, please let me know. maybe i can… --- ## [Use \*TRANSFORM with \*RIGID BODY](https://calculix.discourse.group/t/use-transform-with-rigid-body/2810)
**Author:** [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\ **Replies:** 2\ **Last updated:** [July 18, 2025, 1:57pm UTC](https://calculix.discourse.group/t/use-transform-with-rigid-body/2810 "2025-07-18T13:57:08Z")
i want to use \*TRANSFORM, TYPE=C, NSET=Nrefnode-01 0,0,0,0,0,1 (Nrefnode-01 = 69553) with \*RIGID BODY, NSET=Nboundary-01, REF NODE=69553, ROT NODE=69554 but ccx stops without any messages: STEP 1 Stati… --- ## [Multi-step contact issues](https://calculix.discourse.group/t/multi-step-contact-issues/2805)
**Author:** [@lukerickert](https://calculix.discourse.group/u/lukerickert)\ **Replies:** 2\ **Last updated:** [July 16, 2025, 7:31am UTC](https://calculix.discourse.group/t/multi-step-contact-issues/2805 "2025-07-16T07:31:30Z")
Hi all. I am running some large nonlinear static models that have a shell structure loaded (with contact) by a solid with constrained displacement. It runs no problem (contact works etc) in a step with a small amount of… --- ## [Plastic collapse of a thin-walled cylinder](https://calculix.discourse.group/t/plastic-collapse-of-a-thin-walled-cylinder/2797)
**Author:** [@jcabrerag](https://calculix.discourse.group/u/jcabrerag)\ **Replies:** 11\ **Last updated:** [July 13, 2025, 4:11pm UTC](https://calculix.discourse.group/t/plastic-collapse-of-a-thin-walled-cylinder/2797 "2025-07-13T16:11:12Z")
I am solving a tower composed of sections with different thicknesses (I am using S8R elements because the S4R didn’t work properly before). I would like to determine the plastic collapse of this tower, assuming an ideal… --- ## [Crack Propagation Simulation using Calculix](https://calculix.discourse.group/t/crack-propagation-simulation-using-calculix/2803)
**Author:** [@cae4u](https://calculix.discourse.group/u/cae4u)\ **Replies:** 0\ **Last updated:** [July 12, 2025, 2:38pm UTC](https://calculix.discourse.group/t/crack-propagation-simulation-using-calculix/2803 "2025-07-12T14:38:11Z")
Dear Calculix Users, We were able to simulate crack propagation on, Torsion Loaded Hollow cylinder with transverse hole. We were also able to create multiple crack front. You can watch the overview video at: … --- ## [Non uniform distributed load](https://calculix.discourse.group/t/non-uniform-distributed-load/1892)
**Author:** [@Aly](https://calculix.discourse.group/u/Aly)\ **Replies:** 15\ **Last updated:** [July 3, 2025, 11:46pm UTC](https://calculix.discourse.group/t/non-uniform-distributed-load/1892 "2025-07-03T23:46:16Z")
I was doing stress analysis for an aeroplane wing and I wanted to apply a parabolic distributed load along the length of the wing… Can someone explain how to implement such a non uniform distribution? --- ## [Strain not rotating with dynamic NLGEOM](https://calculix.discourse.group/t/strain-not-rotating-with-dynamic-nlgeom/2788)
**Author:** [@vicmw](https://calculix.discourse.group/u/vicmw)\ **Replies:** 7\ **Last updated:** [July 4, 2025, 12:52am UTC](https://calculix.discourse.group/t/strain-not-rotating-with-dynamic-nlgeom/2788 "2025-07-04T00:52:05Z")
This is a short rod under constant tension and rotating. The strain is correct for the initial orientation (eXX = 1.0e-7), but as it rotates through 180 degrees, the strain doesn’t rotate, as if it’s small displacements.… --- ## [Unexpected out of plane displacements in results](https://calculix.discourse.group/t/unexpected-out-of-plane-displacements-in-results/2787)
**Author:** [@johnnyontheweb](https://calculix.discourse.group/u/johnnyontheweb)\ **Replies:** 1\ **Last updated:** [July 2, 2025, 10:17pm UTC](https://calculix.discourse.group/t/unexpected-out-of-plane-displacements-in-results/2787 "2025-07-02T22:17:10Z")
Hi all, I’m getting unexpected out-of-plane results in the attached model. It’s an arch modelled with S4 elements in XZ plane, and loded in -Z direction. Unexpectedly, I have result displacements in Y. Can you tell wh… --- ## [Base motion for a simple spring mass system](https://calculix.discourse.group/t/base-motion-for-a-simple-spring-mass-system/2775)
**Author:** [@shah](https://calculix.discourse.group/u/shah)\ **Replies:** 5\ **Last updated:** [June 24, 2025, 8:13pm UTC](https://calculix.discourse.group/t/base-motion-for-a-simple-spring-mass-system/2775 "2025-06-24T20:13:33Z")
Hi all, I wanted to better understand the modeling set-up for a steady-state dynamics problem with a base motion, so I tried to run a simple spring-mass system analysis. I could not use the mass element for it as it wa… --- ## [Calculix Vs Abaqus INP displacement value mismatch](https://calculix.discourse.group/t/calculix-vs-abaqus-inp-displacement-value-mismatch/2763)
**Author:** [@mahesh](https://calculix.discourse.group/u/mahesh)\ **Replies:** 5\ **Last updated:** [June 23, 2025, 5:41am UTC](https://calculix.discourse.group/t/calculix-vs-abaqus-inp-displacement-value-mismatch/2763 "2025-06-23T05:41:35Z")
Hello, Greetings! I am currently running a simulation on a cube with dimensions 10 mm × 10 mm × 10 mm, divided into 2 layers with a voxel size of 5 mm. I successfully converted an Abaqus .inp file to a CalculiX-compati… --- ## [Running Calculix on Rescale?](https://calculix.discourse.group/t/running-calculix-on-rescale/2768)
**Author:** [@lukerickert](https://calculix.discourse.group/u/lukerickert)\ **Replies:** 3\ **Last updated:** [June 15, 2025, 2:39pm UTC](https://calculix.discourse.group/t/running-calculix-on-rescale/2768 "2025-06-15T14:39:39Z")
Hi, has anyone run Calculix jobs on Rescale? The interface is far more complicated than I need (I just want to run the jobs and get the .frd files back but they require a post processing scripts but have no examples of … --- ## [Possible bug using \*Contact print](https://calculix.discourse.group/t/possible-bug-using-contact-print/927)
**Author:** [@Matej](https://calculix.discourse.group/u/Matej)\ **Replies:** 15\ **Last updated:** [June 11, 2025, 8:14am UTC](https://calculix.discourse.group/t/possible-bug-using-contact-print/927 "2025-06-11T08:14:51Z")
I have prepared a model of two parts in contact as seen in the bottom image (I am using 2D plane stress for simplicity reasons). The problem is, that when I add a \*Contact print card the simulation ends without the resul… --- ## [Dynamic + Contact + Isotropic Hardening = No Convergence](https://calculix.discourse.group/t/dynamic-contact-isotropic-hardening-no-convergence/302)
**Author:** [@Nekativ](https://calculix.discourse.group/u/Nekativ)\ **Replies:** 8\ **Last updated:** [June 3, 2025, 2:28pm UTC](https://calculix.discourse.group/t/dynamic-contact-isotropic-hardening-no-convergence/302 "2025-06-03T14:28:00Z")
CCX version 2.17 compiled for windows found at http://www.dhondt.de/calculix\_2.17\_4win.zip I have also tested on older versions as well with the same results. When I attempt to use a combination of Non-Linear Dynamic +… --- ## [Define heat flux variable by temperature](https://calculix.discourse.group/t/define-heat-flux-variable-by-temperature/2754)
**Author:** [@maloama](https://calculix.discourse.group/u/maloama)\ **Replies:** 0\ **Last updated:** [June 3, 2025, 9:52am UTC](https://calculix.discourse.group/t/define-heat-flux-variable-by-temperature/2754 "2025-06-03T09:52:38Z")
Hey, i want to define a variable heat flux to a surface or Volume that is temperature dependent. I asked about this a while ago in the prepomax forum already and was given the info that i would have to write a subroutine… --- ## [Stress Sign Convention](https://calculix.discourse.group/t/stress-sign-convention/2746)
**Author:** [@Disla](https://calculix.discourse.group/u/Disla)\ **Replies:** 3\ **Last updated:** [May 21, 2025, 8:53pm UTC](https://calculix.discourse.group/t/stress-sign-convention/2746 "2025-05-21T20:53:21Z")
Hello, ¿Where could I find the ccx Stresses sign convention? ¿Could someone confirm if this common convention is the one used in ccx?. Thank You --- ## [Running CCX with python script](https://calculix.discourse.group/t/running-ccx-with-python-script/2743)
**Author:** [@Paulo](https://calculix.discourse.group/u/Paulo)\ **Replies:** 1\ **Last updated:** [May 18, 2025, 10:42am UTC](https://calculix.discourse.group/t/running-ccx-with-python-script/2743 "2025-05-18T10:42:22Z")
Hello, I am attempting to run CCX through a python script. I have written .inp files but unable to get ccx to run. Is there any documentation on this or any help? --- ## [Strain increment in UMAT](https://calculix.discourse.group/t/strain-increment-in-umat/2742)
**Author:** [@MJJ](https://calculix.discourse.group/u/MJJ)\ **Replies:** 2\ **Last updated:** [May 16, 2025, 4:41pm UTC](https://calculix.discourse.group/t/strain-increment-in-umat/2742 "2025-05-16T16:41:19Z")
I noticed that a user material takes in emec and emec0 in the caclulix interface or DSTRAN in the abaqus interface. I’m assuming DSTRAN = emec - emec0 comes from the displacement increment computed at every newton itera… --- ## [Building CalculiX with PaStiX on FreeBSD without CUDA](https://calculix.discourse.group/t/building-calculix-with-pastix-on-freebsd-without-cuda/2228)
**Author:** [@rsmith](https://calculix.discourse.group/u/rsmith)\ **Replies:** 20\ **Last updated:** [May 15, 2025, 7:46am UTC](https://calculix.discourse.group/t/building-calculix-with-pastix-on-freebsd-without-cuda/2228 "2025-05-15T07:46:49Z")
Over the last couple of weeks I’ve been trying to build a working CalculiX 2.21 solver with PaStiX on FreeBSD 14 (x86-64) without CUDA. I’m using GCC 13 (and gfortran13) for the build. Libraries built (in order): spoo… --- ## [Simulation of cables with tension-only materials](https://calculix.discourse.group/t/simulation-of-cables-with-tension-only-materials/1114)
**Author:** [@nikrouz.bah](https://calculix.discourse.group/u/nikrouz.bah)\ **Replies:** 5\ **Last updated:** [May 14, 2025, 10:03am UTC](https://calculix.discourse.group/t/simulation-of-cables-with-tension-only-materials/1114 "2025-05-14T10:03:14Z")
Hello, everyone! I’m going to model a network of cables connected to a body. I’m using solid elements for the body. I have a few inquiries: 1- Which element type is more appropriate for my situation? truss or beam e… [Next page](https://calculix.discourse.group/c/uncategorized/1.md?page=1)