# Uncategorized **URL:** https://calculix.discourse.group/c/uncategorized/1.md?page=2 [Latest](https://calculix.discourse.group/latest.md) · [Categories](https://calculix.discourse.group/categories.md) **Page:** 3 --- ## [External solver comparison for nonlinear analysis of shell element](https://calculix.discourse.group/t/external-solver-comparison-for-nonlinear-analysis-of-shell-element/2615)
**Author:** [@xyont](https://calculix.discourse.group/u/xyont)\ **Replies:** 8\ **Last updated:** [March 25, 2025, 6:43pm UTC](https://calculix.discourse.group/t/external-solver-comparison-for-nonlinear-analysis-of-shell-element/2615 "2025-03-25T18:43:31Z")
hi, i successfully running several tests of thin-walled steel section in CalculiX with shell element. Analysis type is large deformation and material plasticity to detect buckling behavior, compression loads applied as d… --- ## [Frictional contact separation](https://calculix.discourse.group/t/frictional-contact-separation/2640)
**Author:** [@Marodut](https://calculix.discourse.group/u/Marodut)\ **Replies:** 5\ **Last updated:** [March 25, 2025, 4:45pm UTC](https://calculix.discourse.group/t/frictional-contact-separation/2640 "2025-03-25T16:45:33Z")
Hello everyone! I’m having trouble reaching a valid solution for a set of frictional contacts. I need to simulate the torque that I can apply to a shaft, held by a clamp, before its starts slipping. I’m interested in … --- ## [Gmsh export to inp, missing nsets](https://calculix.discourse.group/t/gmsh-export-to-inp-missing-nsets/2641)
**Author:** [@shroud](https://calculix.discourse.group/u/shroud)\ **Replies:** 5\ **Last updated:** [March 24, 2025, 9:15am UTC](https://calculix.discourse.group/t/gmsh-export-to-inp-missing-nsets/2641 "2025-03-24T09:15:43Z")
Hello, I am trying to export a mesh created in the julia api. It works fine so far, but when creating node sets from physical surfaces, lines or simpy nodes, it does not work as it should. My code: (Should work in pyth… --- ## [Add on custom solvers and post custom results](https://calculix.discourse.group/t/add-on-custom-solvers-and-post-custom-results/2643)
**Author:** [@iyermuku](https://calculix.discourse.group/u/iyermuku)\ **Replies:** 0\ **Last updated:** [March 21, 2025, 12:26pm UTC](https://calculix.discourse.group/t/add-on-custom-solvers-and-post-custom-results/2643 "2025-03-21T12:26:39Z")
Is there documentation in calculus to add-on custom solvers? In other words, can the Fe model be translated to input for specific solvers? Also, can post be extended to support custom formats? --- ## [CAX8 strange result from \*Node Print card](https://calculix.discourse.group/t/cax8-strange-result-from-node-print-card/2636)
**Author:** [@fgr](https://calculix.discourse.group/u/fgr)\ **Replies:** 2\ **Last updated:** [March 17, 2025, 12:44pm UTC](https://calculix.discourse.group/t/cax8-strange-result-from-node-print-card/2636 "2025-03-17T12:44:46Z")
I have defined a small test shaft with a single CAX8 element. It has a diameter of 2mm and a length of 10mm. When I stretch the shaft 0.01mm in axial direction the analytic force will be 659.7N Summarize node forces in … --- ## [Bolted Connections](https://calculix.discourse.group/t/bolted-connections/2548)
**Author:** [@NorbertH](https://calculix.discourse.group/u/NorbertH)\ **Replies:** 24\ **Last updated:** [March 13, 2025, 4:00pm UTC](https://calculix.discourse.group/t/bolted-connections/2548 "2025-03-13T16:00:37Z")
Heyho, just wanted to know if anyone can share how you are modelling bolted connections with and without preload. I want to try if i can utilize the machine learning part classification from cubit to semi automize this… --- ## [Usage with shared objects](https://calculix.discourse.group/t/usage-with-shared-objects/2632)
**Author:** [@chaftaog](https://calculix.discourse.group/u/chaftaog)\ **Replies:** 2\ **Last updated:** [March 12, 2025, 12:10pm UTC](https://calculix.discourse.group/t/usage-with-shared-objects/2632 "2025-03-12T12:10:59Z")
Dear CalculiX community, I try to make a version of CalculiX for usage with shared objects. I added the flags -DCALCULIX\_EXTERNAL\_BEHAVIOURS\_SUPPORT and -DCALCULIX\_EXTERNAL\_BEHAVIOURS\_DEBUG in the Makefile and at the… --- ## [Spring1 + composite](https://calculix.discourse.group/t/spring1-composite/2624)
**Author:** [@konstantin](https://calculix.discourse.group/u/konstantin)\ **Replies:** 3\ **Last updated:** [March 6, 2025, 3:36pm UTC](https://calculix.discourse.group/t/spring1-composite/2624 "2025-03-06T15:36:12Z")
Dear friends, It is bug or not, but pay your attention - If you have element type SPRING1, then you cannot use COMPOSITE in SHELL SECTION and shall be add MATERIAL. \*HEADING LIMIT-LOAD: (PDLF) SELF + MAIN\_LOAD + TEM… --- ## [Can Calculix run across multiple nodes?](https://calculix.discourse.group/t/can-calculix-run-across-multiple-nodes/1316)
**Author:** [@GabrieleJ](https://calculix.discourse.group/u/GabrieleJ)\ **Replies:** 10\ **Last updated:** [February 27, 2025, 3:16pm UTC](https://calculix.discourse.group/t/can-calculix-run-across-multiple-nodes/1316 "2025-02-27T15:16:03Z")
I work in the Scientific Consulting Group at NAS. I need to install Calculix locally for one of my users. He wants to use it on our HPC Cluster. Can we use Calculix across nodes? I don’t see any MPI calls in the source. … --- ## [CalculiX-SCOTCH-PARSEC Docker image](https://calculix.discourse.group/t/calculix-scotch-parsec-docker-image/2589)
**Author:** [@nopria](https://calculix.discourse.group/u/nopria)\ **Replies:** 1\ **Last updated:** [February 23, 2025, 5:19pm UTC](https://calculix.discourse.group/t/calculix-scotch-parsec-docker-image/2589 "2025-02-23T17:19:14Z")
Following the suggestions contained here I’m trying to create a Docker image of CalculiX that uses SCOTCH as partitioning library and PaRSEC as scheduling library: FROM nvidia/cuda:12.3.1-devel-ubuntu22.04 ENV DEBIA… --- ## [Segmentation fault. core dumped](https://calculix.discourse.group/t/segmentation-fault-core-dumped/2605)
**Author:** [@Iacobellis88](https://calculix.discourse.group/u/Iacobellis88)\ **Replies:** 5\ **Last updated:** [February 22, 2025, 10:45am UTC](https://calculix.discourse.group/t/segmentation-fault-core-dumped/2605 "2025-02-22T10:45:52Z")
Hello all, I run a big model 1gb with some contacts sliding. The simulation crashed with this error: Segmentation fault (core dumped) /var/sw/calculix/2.22/bin/ccx\_2.22\_MT $@ This error looks an error due to Calc… --- ## [Seeking UMAT Implementation for Hyperelastic Marlow-like Material Model](https://calculix.discourse.group/t/seeking-umat-implementation-for-hyperelastic-marlow-like-material-model/2598)
**Author:** [@jbr](https://calculix.discourse.group/u/jbr)\ **Replies:** 3\ **Last updated:** [February 21, 2025, 2:42am UTC](https://calculix.discourse.group/t/seeking-umat-implementation-for-hyperelastic-marlow-like-material-model/2598 "2025-02-21T02:42:27Z")
Hello CalCuliX community, I’m currently working on implementing a UMAT for hyperelastic materials in ccx, specifically a model similar to the Marlow model in Abaqus (Abaqus docs). The goal is to use experimental uniaxia… --- ## [Implicit large sliding](https://calculix.discourse.group/t/implicit-large-sliding/2594)
**Author:** [@fgr](https://calculix.discourse.group/u/fgr)\ **Replies:** 7\ **Last updated:** [February 20, 2025, 2:17pm UTC](https://calculix.discourse.group/t/implicit-large-sliding/2594 "2025-02-20T14:17:47Z")
I’m ran a little out of attempts. I have this data set. runway\_tst.inp A brick with friction sliding along a runway with a constant velocity and under gravity load. It runs smoothly to finish with ccx ver. 2.19 & 2.2… --- ## [Ccx on linux computational timing](https://calculix.discourse.group/t/ccx-on-linux-computational-timing/2596)
**Author:** [@Iacobellis88](https://calculix.discourse.group/u/Iacobellis88)\ **Replies:** 1\ **Last updated:** [February 18, 2025, 9:29pm UTC](https://calculix.discourse.group/t/ccx-on-linux-computational-timing/2596 "2025-02-18T21:29:31Z")
hello everyone, currently what is the best way to run cxx on linux in terms of computational timing for big model? Thank you --- ## [U1 Element Direction Issue](https://calculix.discourse.group/t/u1-element-direction-issue/2603)
**Author:** [@SBlade](https://calculix.discourse.group/u/SBlade)\ **Replies:** 20\ **Last updated:** [February 19, 2025, 7:36am UTC](https://calculix.discourse.group/t/u1-element-direction-issue/2603 "2025-02-19T07:36:32Z")
Dear ALL, I have the following code which was originally excerpted from userbeam.inp and slightly modified to suit my needs, I have difficulty of understanding the orientation and direction assignment in Claculix code, … --- ## [Possible Bug in Section Print Flux and Anisotropic Materials](https://calculix.discourse.group/t/possible-bug-in-section-print-flux-and-anisotropic-materials/1528)
**Author:** [@cmcclellan](https://calculix.discourse.group/u/cmcclellan)\ **Replies:** 4\ **Last updated:** [February 17, 2025, 5:30pm UTC](https://calculix.discourse.group/t/possible-bug-in-section-print-flux-and-anisotropic-materials/1528 "2025-02-17T17:30:54Z")
Hi all, I am using Calculix 2.20 and ran into an error when running a heat transfer simulation and trying to record the heat flux through a defined surface. If I use an ORTHO solid material and add the line: \*SECTION P… --- ## [Divergence in simple model](https://calculix.discourse.group/t/divergence-in-simple-model/2599)
**Author:** [@teofil75](https://calculix.discourse.group/u/teofil75)\ **Replies:** 7\ **Last updated:** [February 17, 2025, 8:00am UTC](https://calculix.discourse.group/t/divergence-in-simple-model/2599 "2025-02-17T08:00:12Z")
Dear Discourse Group, I have created this simple shell model, but when I turn on NLGEOM, the simulation diverges. It is quite a simple model, without contacts and using only plasticity. I would like to post the gz mode… --- ## [Pardiso for Linux](https://calculix.discourse.group/t/pardiso-for-linux/2566)
**Author:** [@Iacobellis88](https://calculix.discourse.group/u/Iacobellis88)\ **Replies:** 7\ **Last updated:** [February 14, 2025, 8:28pm UTC](https://calculix.discourse.group/t/pardiso-for-linux/2566 "2025-02-14T20:28:23Z")
Hello everybody, Is there a version of Pardiso for Linux? Thank you --- ## [Pressure-overclosure=Tabular](https://calculix.discourse.group/t/pressure-overclosure-tabular/2591)
**Author:** [@AFranco](https://calculix.discourse.group/u/AFranco)\ **Replies:** 5\ **Last updated:** [February 13, 2025, 2:38pm UTC](https://calculix.discourse.group/t/pressure-overclosure-tabular/2591 "2025-02-13T14:38:21Z")
Hi All, normally i am a user of Abaqus. I am trying to understand the opportunity to use Calculix in my analysis. One of the problems i have to face is the analysis of the contact between two components (to see if it o… --- ## [RC beam analysis - too low stress in rebar](https://calculix.discourse.group/t/rc-beam-analysis-too-low-stress-in-rebar/2585)
**Author:** [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Replies:** 36\ **Last updated:** [February 13, 2025, 5:16am UTC](https://calculix.discourse.group/t/rc-beam-analysis-too-low-stress-in-rebar/2585 "2025-02-13T05:16:44Z")
Hi, I’m analyzing an RC (reinforced concrete) beam with a rectangular cross-section and two steel bars in its lower part (no interactions/constraints - all parts are merged into a compound). The beam is subjected to pur… --- ## [Error solving: SPC meaning](https://calculix.discourse.group/t/error-solving-spc-meaning/2583)
**Author:** [@Aurea](https://calculix.discourse.group/u/Aurea)\ **Replies:** 12\ **Last updated:** [February 12, 2025, 2:19am UTC](https://calculix.discourse.group/t/error-solving-spc-meaning/2583 "2025-02-12T02:19:11Z")
Good morning, Trying to run my code I get this error, but do not understand where it comes from or what I have to check. What is the meaning of SPC ? MPC is multi point constraint? \*ERROR in cascade: the DOF correspond… --- ## [Surface behaviour warning](https://calculix.discourse.group/t/surface-behaviour-warning/2582)
**Author:** [@Aurea](https://calculix.discourse.group/u/Aurea)\ **Replies:** 8\ **Last updated:** [February 11, 2025, 6:57am UTC](https://calculix.discourse.group/t/surface-behaviour-warning/2582 "2025-02-11T06:57:48Z")
Good morning, I am running a 2D contact problem with node to surface behaviour, but I get this warnings I do not understand. I know they are warnings but would like to undrstand them and try to delete them if possible. … --- ## [GK3D8N element for sealing](https://calculix.discourse.group/t/gk3d8n-element-for-sealing/2584)
**Author:** [@Iacobellis88](https://calculix.discourse.group/u/Iacobellis88)\ **Replies:** 5\ **Last updated:** [February 10, 2025, 12:17pm UTC](https://calculix.discourse.group/t/gk3d8n-element-for-sealing/2584 "2025-02-10T12:17:04Z")
Hello everyone, I would like to know if gasket element exists in ccx. I use this element GK3D8N in Abaqus to evaluate sealing. If no, there is another element in calculix that can replace this element? Thank you --- ## [Kinematic keyword definition](https://calculix.discourse.group/t/kinematic-keyword-definition/2577)
**Author:** [@Aurea](https://calculix.discourse.group/u/Aurea)\ **Replies:** 5\ **Last updated:** [February 9, 2025, 1:59pm UTC](https://calculix.discourse.group/t/kinematic-keyword-definition/2577 "2025-02-09T13:59:28Z")
I am writting my model and I have doubts about the correct use of this keyword. I have a reference node connected to a surface (in this case the inner surface of a gear middle circle) with a coupling constraint: \*Coup… --- ## [Pass entire path for batch mode runs](https://calculix.discourse.group/t/pass-entire-path-for-batch-mode-runs/2576)
**Author:** [@loghin](https://calculix.discourse.group/u/loghin)\ **Replies:** 0\ **Last updated:** [February 7, 2025, 8:35pm UTC](https://calculix.discourse.group/t/pass-entire-path-for-batch-mode-runs/2576 "2025-02-07T20:35:43Z")
Hello I am trying to run calculiX in batch mode from command prompt (cygwin). Solution runs correctly (the desired output file case1.dat is created and has content) if I use: “E:/CalculiX/ccx\_static.exe” -i case1 If I… --- ## [Node and elements in data check](https://calculix.discourse.group/t/node-and-elements-in-data-check/2574)
**Author:** [@Iacobellis88](https://calculix.discourse.group/u/Iacobellis88)\ **Replies:** 11\ **Last updated:** [February 7, 2025, 6:12pm UTC](https://calculix.discourse.group/t/node-and-elements-in-data-check/2574 "2025-02-07T18:12:09Z")
hello everyone, when i run a simulation, I dont understand why the node and elements that i see in the datacheck (picture) are much more than real number of nodes and elements that are in the model(physical nodes) --- ## [Compile CalculiX complete guide](https://calculix.discourse.group/t/compile-calculix-complete-guide/2570)
**Author:** [@teofil75](https://calculix.discourse.group/u/teofil75)\ **Replies:** 5\ **Last updated:** [January 30, 2025, 9:10pm UTC](https://calculix.discourse.group/t/compile-calculix-complete-guide/2570 "2025-01-30T21:10:04Z")
Hello everyone, Recently, I published a step-by-step procedure to explain how to compile CalculiX, tested on Linux Kubuntu 24.04. The web page is: If anyone would like to contribute by identifying any possible overlo… --- ## [Shell elements and symmetry boundary conditions](https://calculix.discourse.group/t/shell-elements-and-symmetry-boundary-conditions/380)
**Author:** [@Matej](https://calculix.discourse.group/u/Matej)\ **Replies:** 10\ **Last updated:** [January 30, 2025, 3:21pm UTC](https://calculix.discourse.group/t/shell-elements-and-symmetry-boundary-conditions/380 "2025-01-30T15:21:17Z")
In the following example, I have two separate shell meshes, green and beige. Both meshes consist of S8 shell elements. The node-set 1 is used for a fixed boundary condition. The node-set 2 is used to apply a concentrated… --- ## [Restart simulation and add contact](https://calculix.discourse.group/t/restart-simulation-and-add-contact/2505)
**Author:** [@Marin](https://calculix.discourse.group/u/Marin)\ **Replies:** 23\ **Last updated:** [January 24, 2025, 4:42pm UTC](https://calculix.discourse.group/t/restart-simulation-and-add-contact/2505 "2025-01-24T16:42:55Z")
Hi, I am trying to restart (continue) a CalculiX simulation after the first load step has completed. In this restarted simulation, I want to add a surface interaction (contact) between two surfaces. However, I am gettin… --- ## [Constant velocity motion of a structure](https://calculix.discourse.group/t/constant-velocity-motion-of-a-structure/2545)
**Author:** [@daosheng](https://calculix.discourse.group/u/daosheng)\ **Replies:** 71\ **Last updated:** [January 23, 2025, 3:19pm UTC](https://calculix.discourse.group/t/constant-velocity-motion-of-a-structure/2545 "2025-01-23T15:19:20Z")
Hello everyone! I am a beginner and I want my plate always move in the y direction at a fixed speed. I have searched many tutorials but have not found any similar cases. How can I set it in the inp file? Thanks. [Previous page](https://calculix.discourse.group/c/uncategorized/1.md?page=1) [Next page](https://calculix.discourse.group/c/uncategorized/1.md?page=3)