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  • I would like to know how to make a thermal connection between two objects in a Patran/Nastran 2021 heat transfer analysis.

    I did a thermal analysis on two blocks with temperatures on the top and bottom. There was no heat transfer between the two blocks, and the temperatures were constant for each block. I would like to know how to thermally connect the blocks…

  • Patran2021に置ける伝熱解析の2物体間の熱的接続の方法をご教授をお願いします。

    2つのブロックを重ねて上下に温度差をつけて熱解析を行ったのですが、2物体での温度の行き来がなく、ブロックごとで温度が定常になってしまいました。 お手数ですが、​ブロックを熱的に接続する方法を教えていただきたいです。 ​ 始めたての初心者ですので、極力詳細に教えていただけると幸いです。​

  • Hello, I am trying to use the utility "Align solid element" determine the material orientation for solid shell composite elements but I can't align properly all the elements of my model.

    1. Created dummy property with user made coord for elements that need to be oriented 2. Looked at material orientation (mat_orient_before.png) 3. Used “Align solid elements” in utilities. Align type: coordinate systems. Z normal to chosen surface…

  • Load Applied to Surface as Gradient

    I am looking to apply a load to a meshed geometric surface/solid as a parametric gradient (i.e. a total load that starts as 0 nodal force at one corner of the surface and grows at each node as a spatial function as it gets further away from my starting…

  • initialization

    initialization

  • Hello, I am trying to model a bolted connection with two RBE2 spiders (one for a threaded surface, one for a washer surface of the bolt). I connect these using a beam element split at the center.

    The connections work great without preload. I have problems when attempting to apply preload. I have tried the utilities and tools preload options, neither have worked. I tried to split my beams manually and use overclosure MPC to tie them, apply BC and…

  • How to postprocess temperature decrease in Patran

    Hello i have rubber model of silentblock using sol400, my first load step is static, where is defined initial temperature 150 degs and nodal temperature at time 1 (20 degs). From disp. results it looks like model is working (silentblock is shrinking)…

  • What is the difference between CPPs provided by Patran 2016 and Patran 2020?

    When I precompile my pcl codes using cpp.exe provided by Patran 2020, some mistakes occurr. But everything is OK when I use cpp.exe provided by Patran 2016. I guess some rules of the precompiler have changed. I wonder, what updates the new compilers…

  • In an aircraft loads model, element results pulled using the report function differ slightly from loads pulled using MSC Explore in Patran.

    I have each one using CIS "as is", and the results are very close, but there are some very small differences. Nothing that would cause concern, I'm just trying to understand the reason why they are different. Thanks!

  • Exterior and interior points while creating superelements

    I create Superelements by using the groupe function in Patran. After creating a groupe I make a superelement out of it in the element section. For the analyse I use the superelements as PART elements. The analyse with Nastran interrupt because of this…

  • How to import an xdb file?

    I solved a model over an high performance computer with Nastran. I want to open the result with Patran to see the grafic and get the eigenfrequencies. But I cant import a xdb file. How can I get the grafical evaluation?

  • I am trying to read in a multi-file model into patran 2018 that has duplicate grids. The model runs fine in nastran but patran will not accept the duplicate grids. It is painful to go back and edit the files to get it to run. Is there a work around?

    I am trying to read in a multi-file model into patran 2018 that has duplicate grids. The model runs fine in nastran but patran will not accept the duplicate grids. It is painful to go back and edit the files to get it to run. Is there a work around?

  • Problem to create Superelements

    I try to create two Superelements in Patran. I have made two groups with different material. Everytime I try to create the second superelement patran is closing itself. Could someone help me to creat and analyse superelements? I have used the Patran…

  • Strange eigenmoden for a split geometry.

    Hey, I have created a splitted plate with the same material. The mesh seeds are on the exterior. The result from the modal analysis shows a deformation only at one side (shown in the picture). Why does only half of the geometry react at…

  • Where do I find reduction methods?

    Hey, I know that I can use CMS oder Craig Bampton to reduce a model. But I can't find the section for the reduction method on the interface on Patran.

  • How to generate an bdf/dat file without using the analyze function?

    I need to write an Input File for Nastran. My modell is created by Patran. I know this programms have an automatical interface. But I can´t use it in this case. I want to generate an bdf/dat file from Patran without using the Nastran analysis. After…

  • Check of Interlaminar stresses using SOL400

    ​Hello, I performed the contact analysis using SOL400 . I would like to check the Interlaminar stresses (Sigma1, Sigma2 and Sigma(3 or 12) of the CFRP Structure using Patran. In the Post processing Results section of Patran, to check the…

  • Cannot import a bdf into Partan 2016

    I am trying to import a bdf into PATRAN 2016 but I cannot get it to work. I always get the following error message: "Creating Nastran Database using SOL nifimp_v22: Failed but continue" I have imported this same bdf into an older version of…

  • Groups to session worked for nodes/elements but not for geometry. How to reorganize Geometry from a crashed database into its respective groups?

    I tried this 3 step approach but it DID NOT WORK - it basically adds any geometry associated to nodes/elements to the group in which nodes/elements are. step1. Turn on all groups in the db then go to Meshing, Associate > Element > Solid, select…

  • Is there a way to create an RSSCON card in Patran?

    Is there a way to create an RSSCON card in Patran?

  • Temperature definition using fields in Three directions

    Hello, I need to define the temperature for 3D Cylindrical structure. The nodes are defined in Cylindrical Coordinate System and the temperature varies in ( R, Theta, Z ) in all three directions at interval of 25°. The thickness of structures…

  • How to limit optimization to a local area? (SOL 200, Topology Optimization)

    How do I setup an optimization of a solid element part BUT limit the optimization region to some subset of elements? I tried targeting a group containing the subset of elements but it fails to still recognize the whole part including LBCs. Attached…

  • Is there a way to quickly "unequivalence" a group of elements to create a crack with coincident nodes? That would save all the trouble of manually deleteing each element creating new nodes and then recreating all of the elements just to make a c

    Is there a way to quickly "unequivalence" a group of elements to create a crack with coincident nodes? That would save all the trouble of manually deleteing each element creating new nodes and then recreating all of the elements just to make a crack.

  • We need each element in our fem to be assigned to its own property having PID equal to the ID of the element . Is there an easy way to do this with a convenient Patran or Nastran fem where multiple elements are assingned to each property?

    We need each element in our fem to be assigned to its own property having PID equal to the ID of the element . Is there an easy way to do this with a convenient Patran or Nastran fem where multiple elements are assingned to each property?

  • Patran Results shows two values for shell in-plane shear component: XY component and XY Engr. Component. Why are there two shear components and which one should be used for shear stress calculation to be compared against material allowable shear stress...

    Patran Results shows two values for shell in-plane shear component: XY component and XY Engr. Component. Why are there two shear components and which one should be used for shear stress calculation to be compared against material allowable shear stress…
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