# \#material-definition **URL:** https://prepomax.discourse.group/tag/material-definition/4.md [Latest](https://prepomax.discourse.group/latest.md) · [Categories](https://prepomax.discourse.group/categories.md) · [Tags](https://prepomax.discourse.group/tags.md) --- ## [Change in the coefficient of thermal expansion](https://prepomax.discourse.group/t/change-in-the-coefficient-of-thermal-expansion/3715)
**Author:** [@nori](https://prepomax.discourse.group/u/nori)\ **Replies:** 3\ **Last updated:** [October 2, 2026, 2:35pm UTC](https://prepomax.discourse.group/t/change-in-the-coefficient-of-thermal-expansion/3715 "2026-10-02T14:35:37Z")
I hope this message finds you well. I am currently planning to perform a thermal stress analysis. When entering the material properties, I would like to define the material properties as temperature-dependent, so that t… --- ## [Regarding the irradiation creep conditions](https://prepomax.discourse.group/t/regarding-the-irradiation-creep-conditions/3680)
**Author:** [@nori](https://prepomax.discourse.group/u/nori)\ **Replies:** 3\ **Last updated:** [September 23, 2026, 6:44am UTC](https://prepomax.discourse.group/t/regarding-the-irradiation-creep-conditions/3680 "2026-09-23T06:44:52Z")
Dear Sir or Madam I am a researcher specializing in nuclear materials, and I am particularly interested in using PrePoMax to analyze irradiation creep. Regarding gamma heating, I believe that the resulting heat generati… --- ## [Laminate ABD matrix direct input](https://prepomax.discourse.group/t/laminate-abd-matrix-direct-input/3666)
**Author:** [@Giuseppe](https://prepomax.discourse.group/u/Giuseppe)\ **Replies:** 1\ **Last updated:** [September 13, 2026, 12:46pm UTC](https://prepomax.discourse.group/t/laminate-abd-matrix-direct-input/3666 "2026-09-13T12:46:56Z")
Good morning, I’d like to know if it’s possible to directly input the laminate ABD matrix, possibly with the keywords ? I know it’s possible to specify E\_L, E\_T etc of each ply , but for my analysis I want to input the… --- ## [Overall mass properties of model](https://prepomax.discourse.group/t/overall-mass-properties-of-model/3432)
**Author:** [@BJM-Maxx](https://prepomax.discourse.group/u/BJM-Maxx)\ **Replies:** 4\ **Last updated:** [April 23, 2026, 6:23pm UTC](https://prepomax.discourse.group/t/overall-mass-properties-of-model/3432 "2026-04-23T18:23:03Z")
Hello, new to PrePoMax and still learning the interface. I have a simple functioning model where gravity causes a sag in a flexibly mounted part. I am sure this is a simple question, but how do I confirm the overall ma… --- ## [Defining Density for a Compression only Material definition](https://prepomax.discourse.group/t/defining-density-for-a-compression-only-material-definition/3377)
**Author:** [@LuC-137](https://prepomax.discourse.group/u/LuC-137)\ **Replies:** 1\ **Last updated:** [March 26, 2026, 8:05am UTC](https://prepomax.discourse.group/t/defining-density-for-a-compression-only-material-definition/3377 "2026-03-26T08:05:21Z")
Hello, Im using the Calculix Keyword edtior to define a compression only Material, to “simulate” concrete. This works reasonably well at the moment. However i need to consider the weight/gravity of the concrete, therefo… --- ## [Convergence in Dynamic Simulation](https://prepomax.discourse.group/t/convergence-in-dynamic-simulation/3366)
**Author:** [@Kayky\_Brambilla](https://prepomax.discourse.group/u/Kayky_Brambilla)\ **Replies:** 9\ **Last updated:** [March 23, 2026, 6:09pm UTC](https://prepomax.discourse.group/t/convergence-in-dynamic-simulation/3366 "2026-03-23T18:09:48Z")
Hello, I’m working on my final year project about an impact attenuator and I’m starting with PrePoMax. To ensure the simulation is accurate, I’m redoing a dynamic simulation I saw in a scientific article. The problem I’… --- ## [Skateboard modeling](https://prepomax.discourse.group/t/skateboard-modeling/3323)
**Author:** [@Jozsef](https://prepomax.discourse.group/u/Jozsef)\ **Replies:** 1\ **Last updated:** [March 9, 2026, 10:25am UTC](https://prepomax.discourse.group/t/skateboard-modeling/3323 "2026-03-09T10:25:51Z")
Hello, We are currently working on a student project involving the structural analysis of a skateboard deck. Our main interest is to evaluate the deflection and stress distribution under a static load case. Would you r… --- ## [Prepomax example 2 wrong results](https://prepomax.discourse.group/t/prepomax-example-2-wrong-results/3248)
**Author:** [@fasanifrancesco](https://prepomax.discourse.group/u/fasanifrancesco)\ **Replies:** 2\ **Last updated:** [February 14, 2026, 5:46pm UTC](https://prepomax.discourse.group/t/prepomax-example-2-wrong-results/3248 "2026-02-14T17:46:26Z")
Dear Community, I am new to Prepomax and so I have started from the 2nd tutorial “Shaft with surface traction loading” from 2021.09.07-PrePoMax-v1.1.0-examples-manual.pdf to understand interface and prompts. The problem… --- ## [Roller and belt contact analysis of transmission](https://prepomax.discourse.group/t/roller-and-belt-contact-analysis-of-transmission/3231)
**Author:** [@8080\_1](https://prepomax.discourse.group/u/8080_1)\ **Replies:** 10\ **Last updated:** [February 4, 2026, 12:10pm UTC](https://prepomax.discourse.group/t/roller-and-belt-contact-analysis-of-transmission/3231 "2026-02-04T12:10:53Z")
Hii folks, Today I was simulating the rubber and belt contact analysis. Maybe my contacts are not right. please check it and give any suggestion over it I am trying to simulate this. here is the file --- ## [Linear and non-linear analysis of structures and analysis of results. Evaluation of analyses performed and problem solving](https://prepomax.discourse.group/t/linear-and-non-linear-analysis-of-structures-and-analysis-of-results-evaluation-of-analyses-performed-and-problem-solving/3203)
**Author:** [@Krzysztof.B](https://prepomax.discourse.group/u/Krzysztof.B)\ **Replies:** 21\ **Last updated:** [January 20, 2026, 7:37pm UTC](https://prepomax.discourse.group/t/linear-and-non-linear-analysis-of-structures-and-analysis-of-results-evaluation-of-analyses-performed-and-problem-solving/3203 "2026-01-20T19:37:24Z")
Hello everyone, I have been following this forum for some time and have learned a lot from it. Although I deal with engineering problems on a daily basis, I am not an FEM expert. I would appreciate your feedback on the … --- ## [I am not able to import the attached step file](https://prepomax.discourse.group/t/i-am-not-able-to-import-the-attached-step-file/3091)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 13\ **Last updated:** [November 14, 2025, 11:26am UTC](https://prepomax.discourse.group/t/i-am-not-able-to-import-the-attached-step-file/3091 "2025-11-14T11:26:42Z")
Hi, Iam not able to import the step file. If I import the file we get errors. Any idea what is wrong please. --- ## [Model of the double-bearing overhung rotor](https://prepomax.discourse.group/t/model-of-the-double-bearing-overhung-rotor/3005)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 38\ **Last updated:** [October 15, 2025, 11:13am UTC](https://prepomax.discourse.group/t/model-of-the-double-bearing-overhung-rotor/3005 "2025-10-15T11:13:05Z")
Dear All, Can you please share an example of how to build the model of the double-bearing overhung rotor --- ## [Prepomax issue - "Missing section assignment at element...."](https://prepomax.discourse.group/t/prepomax-issue-missing-section-assignment-at-element/2948)
**Author:** [@Rohan23456](https://prepomax.discourse.group/u/Rohan23456)\ **Replies:** 2\ **Last updated:** [September 4, 2025, 4:38pm UTC](https://prepomax.discourse.group/t/prepomax-issue-missing-section-assignment-at-element/2948 "2025-09-04T16:38:13Z")
Hello everyone, i am trying to simulate a wing with ribs inside, i am continuously facing this issue: Can someone please tell me how only only element can’t be assigned material? I am working with the orthotropic mat… --- ## [Comparing material stress-strain curve with uni-axial tension test analysis](https://prepomax.discourse.group/t/comparing-material-stress-strain-curve-with-uni-axial-tension-test-analysis/1040)
**Author:** [@Cimek](https://prepomax.discourse.group/u/Cimek)\ **Replies:** 29\ **Last updated:** [July 25, 2025, 6:48am UTC](https://prepomax.discourse.group/t/comparing-material-stress-strain-curve-with-uni-axial-tension-test-analysis/1040 "2025-07-25T06:48:29Z")
I’m testing the new Johnson-Cook material model so I made a square cube model meshed with 6 parabolic tetrahedron C3D10 elements. I applied symmetry constraints to 3 sides to prevent rigid body motion and displacement to… --- ## [Issue with Bearing Load Analysis Using Spring Elements in Laminated Composite (CalculiX Keyword)](https://prepomax.discourse.group/t/issue-with-bearing-load-analysis-using-spring-elements-in-laminated-composite-calculix-keyword/2868)
**Author:** [@Dasta](https://prepomax.discourse.group/u/Dasta)\ **Replies:** 1\ **Last updated:** [July 22, 2025, 7:09am UTC](https://prepomax.discourse.group/t/issue-with-bearing-load-analysis-using-spring-elements-in-laminated-composite-calculix-keyword/2868 "2025-07-22T07:09:08Z")
Hello everyone, I’m currently working on a bearing load analysis for a laminated composite plate consisting of 20 layers. Below is a summary of the setup and the issue I’m facing: I modeled the bearing load by first … --- ## [How to "translate" materials datasheet to Prepomax material?](https://prepomax.discourse.group/t/how-to-translate-materials-datasheet-to-prepomax-material/2818)
**Author:** [@EDRobert](https://prepomax.discourse.group/u/EDRobert)\ **Replies:** 4\ **Last updated:** [July 4, 2025, 5:25pm UTC](https://prepomax.discourse.group/t/how-to-translate-materials-datasheet-to-prepomax-material/2818 "2025-07-04T17:25:44Z")
Disclaimer: I’m an industrial designer and not an engineer. That means I’m a right brained artsy fartsy person who does not do well with numbers, but I think it would be useful to learn some basic things here… However, … --- ## [Help Needed: Aircraft simulation in prepomax (Load ,Boundary Conditions, and Validation)](https://prepomax.discourse.group/t/help-needed-aircraft-simulation-in-prepomax-load-boundary-conditions-and-validation/2799)
**Author:** [@Dev](https://prepomax.discourse.group/u/Dev)\ **Replies:** 9\ **Last updated:** [June 27, 2025, 9:29pm UTC](https://prepomax.discourse.group/t/help-needed-aircraft-simulation-in-prepomax-load-boundary-conditions-and-validation/2799 "2025-06-27T21:29:05Z")
Hello, I am new to PrePoMax and would really appreciate your help. I am trying to simulate an aircraft structure made of carbon fiber material with 2 mm thickness, and I have several questions: 1) Linear vs Nonline… --- ## [Procedure to model plastic behavior using material data from tensile test](https://prepomax.discourse.group/t/procedure-to-model-plastic-behavior-using-material-data-from-tensile-test/1388)
**Author:** [@FdoLorenzo](https://prepomax.discourse.group/u/FdoLorenzo)\ **Replies:** 10\ **Last updated:** [June 27, 2025, 2:04pm UTC](https://prepomax.discourse.group/t/procedure-to-model-plastic-behavior-using-material-data-from-tensile-test/1388 "2025-06-27T14:04:48Z")
I have read questions from users as to how to model plastic behavior in Prepomax and thought that I can contribute a little bit. The analysis in this post comes from one of my Professors at the University of Michigan Jos… --- ## [Multiple Shell Sections in one Model not working?](https://prepomax.discourse.group/t/multiple-shell-sections-in-one-model-not-working/1892)
**Author:** [@hnrwagner](https://prepomax.discourse.group/u/hnrwagner)\ **Replies:** 17\ **Last updated:** [June 6, 2025, 9:32am UTC](https://prepomax.discourse.group/t/multiple-shell-sections-in-one-model-not-working/1892 "2025-06-06T09:32:59Z")
Hello, At the moment I am testing PrePoMax 2.1.0 for the buckling analysis of a wind turbine tower, the tower is a shell with multiple different sections (different wall thicknesses ). I start with a “Buckle” Analy… --- ## [Set mesh type default preferences?](https://prepomax.discourse.group/t/set-mesh-type-default-preferences/2687)
**Author:** [@frank](https://prepomax.discourse.group/u/frank)\ **Replies:** 9\ **Last updated:** [May 13, 2025, 10:13am UTC](https://prepomax.discourse.group/t/set-mesh-type-default-preferences/2687 "2025-05-13T10:13:40Z")
Tried to find it but with no luck, would it be possible to set preferences for the mesh type somewhere? I have shell elements which I like to expand to plies through keywords. I do need to have S8R elements but after me… --- ## [3pb unexpected results when varying input data](https://prepomax.discourse.group/t/3pb-unexpected-results-when-varying-input-data/2661)
**Author:** [@frank](https://prepomax.discourse.group/u/frank)\ **Replies:** 4\ **Last updated:** [April 29, 2025, 10:08am UTC](https://prepomax.discourse.group/t/3pb-unexpected-results-when-varying-input-data/2661 "2025-04-29T10:08:34Z")
Good afternoon. I am a little confused and hope someone here could help me explain this? I have a 3-point-bending simulation of a sandwich panel with composite skins and an aluminium core. I tried making small variation… --- ## [Structural analysis of glulam](https://prepomax.discourse.group/t/structural-analysis-of-glulam/2255)
**Author:** [@alerodm321](https://prepomax.discourse.group/u/alerodm321)\ **Replies:** 26\ **Last updated:** [March 6, 2025, 4:25pm UTC](https://prepomax.discourse.group/t/structural-analysis-of-glulam/2255 "2025-03-06T16:25:41Z")
I am an architect and work with Grasshopper and Karamba, but I need an advanced software to conduct structural analysis of glulam beams and columns. Can anyone tell me if this is possible in PrePoMax and explain how to d… --- ## [Orthotropic Material Definition](https://prepomax.discourse.group/t/orthotropic-material-definition/2479)
**Author:** [@naveen\_rg](https://prepomax.discourse.group/u/naveen_rg)\ **Replies:** 5\ **Last updated:** [February 18, 2025, 2:43am UTC](https://prepomax.discourse.group/t/orthotropic-material-definition/2479 "2025-02-18T02:43:55Z")
I’m trying to define the orthotropic material property for both shell element and solid element. The syntax followed is \*MATERIAL, NAME=ORTHO \*Density 1.6E-09 \*ELASTIC, TYPE=ORTHO 59132.53, 59132.53, 10000, 0.004, … --- ## [Composite material definition](https://prepomax.discourse.group/t/composite-material-definition/2480)
**Author:** [@naveen\_rg](https://prepomax.discourse.group/u/naveen_rg)\ **Replies:** 1\ **Last updated:** [February 17, 2025, 1:30pm UTC](https://prepomax.discourse.group/t/composite-material-definition/2480 "2025-02-17T13:30:57Z")
Can you help me with the syntax to define the composite material property for a tube which is oriented along x axis and how can i define the stack up combining 2 different layers?. And Also, How can i define the element… --- ## [Using HYPERFOAM to model foam compression](https://prepomax.discourse.group/t/using-hyperfoam-to-model-foam-compression/2412)
**Author:** [@amirkh](https://prepomax.discourse.group/u/amirkh)\ **Replies:** 5\ **Last updated:** [January 29, 2025, 6:03pm UTC](https://prepomax.discourse.group/t/using-hyperfoam-to-model-foam-compression/2412 "2025-01-29T18:03:22Z")
I am working on setting up a simple disk to be compressed using \*HYPERFOAM model. When I activate the hyperforam model with these coefficients \*HYPERFOAM,N=1 37000.0,2.944,0.0404,0.0 for some reason the disk compressi… --- ## [Unable to mesh an imported geometry](https://prepomax.discourse.group/t/unable-to-mesh-an-imported-geometry/2310)
**Author:** [@WIwat](https://prepomax.discourse.group/u/WIwat)\ **Replies:** 8\ **Last updated:** [January 22, 2025, 10:23am UTC](https://prepomax.discourse.group/t/unable-to-mesh-an-imported-geometry/2310 "2025-01-22T10:23:51Z")
I can’t generate mesh on my model, took too long and seems non-stop. My mesh sizing is 0.001 mm. and my model is a circular bound surface with 0.1 thickness and 1.0 m. diameter. Could anyone help me on this? What is happ… --- ## [Thread forming possible?](https://prepomax.discourse.group/t/thread-forming-possible/2286)
**Author:** [@FJK](https://prepomax.discourse.group/u/FJK)\ **Replies:** 9\ **Last updated:** [December 20, 2024, 12:40pm UTC](https://prepomax.discourse.group/t/thread-forming-possible/2286 "2024-12-20T12:40:44Z")
Dear fellow Users I am about to start my master thesis. I would like to use PrePoMax for this thesis, but before i pitch this to my Professor, i would like to check if my idea/topic is possible in PrePoMax. My experie… --- ## [Sharing materials database from FEA in production: automotive, defence, etc](https://prepomax.discourse.group/t/sharing-materials-database-from-fea-in-production-automotive-defence-etc/2196)
**Author:** [@Sound\_Spinning](https://prepomax.discourse.group/u/Sound_Spinning)\ **Replies:** 3\ **Last updated:** [November 19, 2024, 2:54pm UTC](https://prepomax.discourse.group/t/sharing-materials-database-from-fea-in-production-automotive-defence-etc/2196 "2024-11-19T14:54:47Z")
Hi There, I’ve noticed that PrePoMax has the ability to import ‘chunks’ of data via \*.inp files. Wonderful, Aba/CAE didn’t used to allow that, dunno now. So, I’ve compiled (part of) my structural materials from Abaqus … --- ## [Request for feedback - motor shaft](https://prepomax.discourse.group/t/request-for-feedback-motor-shaft/2101)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 1\ **Last updated:** [October 23, 2024, 5:49am UTC](https://prepomax.discourse.group/t/request-for-feedback-motor-shaft/2101 "2024-10-23T05:49:33Z")
Dear All, Do you have a model built for calculating a motor shaft? Modal Analysis Harmonic & Frequency Response Plot Fatigue etc. --- ## [Motor side cap deformation](https://prepomax.discourse.group/t/motor-side-cap-deformation/2097)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 8\ **Last updated:** [October 22, 2024, 1:36pm UTC](https://prepomax.discourse.group/t/motor-side-cap-deformation/2097 "2024-10-22T13:36:13Z")
Dear All, We are designing a motor side cap for the electric motor. The model is attached (step file). We are planning to mount 6304 bearings. Radial load on the bearing is 2.4kN ( motor rpm ~10000) We want to unders… [Next page](https://prepomax.discourse.group/tag/material-definition/4.md?match_all_tags=true&page=1&tags%5B%5D=material-definition)