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  • Matlab Script to read OP4

    I'm looking for a Matlab script to read in Nastran matrices from *.op4 file in a reliable way. I've come across various scripts on Google (including pynastran) but somehow none of them is giving me 100% error-free results. Any suggestions? …

  • How to export mass and stiffness matrices of a constrained model?

    I'd like to export mass and stiffness matrices of a constrained model (e.g. MPC applied) and retain information on the ASET, i.e. the independent degrees of freedom. Is that possible somehow? Up to now I've used to obtain the relevant matrices…

  • How can extract the mass, stiffness and structural damping matrices from a .bdf file?

    Hi, I need to extract the mass, stiffness and damping structural matrices from a .bdf files. Normally I just needed to add the following lines after BEGIN BULK in the .bdf file to get that: "PARAM,EXTOUT,DMIGPCH" "PARAM,COUPMASS…

  • Error extracting the mass, stiffness and structural damping matrices from a .bdf file

    Hi, I need to extract the mass, stiffness and damping structural matrices from a .bdf files. Normally I just needed to add the following lines after BEGIN BULK in the .bdf file to get that: "PARAM,EXTOUT,DMIGPCH" "PARAM,COUPMASS…

  • I have a modal analysis of a large system that I need to stop temporarily while higher priority analysis jobs can be run. Aside from a restart are there any options in "pausing" an analysis?

    I have a modal analysis of a large system that I need to stop temporarily while higher priority analysis jobs can be run. Aside from a restart are there any options in "pausing" an analysis?

  • pausing a nastran sol 101 run to interface an external code.

    I have a sol 101 with multiple subcases and my objective is for nastran to complete one subcase, wait till an external code post-processes the results for the completed subcase (for example say calculate a user defined failure criteria). If the failure…

  • Not getting composite layers stresses in sol 112 .op2 file

    I get the composite layer stresses in a static solution in the .op2, but not in the modal transient response. Requesting the stresses to the .f06 gives me the correct results. Is there any way to get the modal transient stresses in sol112 in .op2 file…

  • How to verify correctness of static analysis run with inertia relief (INREL,-2)?

    Hello, I run a static analysis (SOL101) using the parameter INREL,-2. My structure has 6 rigid body modes + 1 mechanism mode in dof 6 (mode at 0.06 Hz with modal effective masses = 0 in all dof)​. On the Natsran QRG I see that if…

  • Trouble with 3D Orthotropic Materials for Solid Composites

    Trouble with Solid Composite elements. I'm running a test model of a cantilever strip beam to compare a composite shell with a composite solid. I've defined 3D orthotropic materials based from 2D values, but the results I get suggest the solid…

  • Dear all, I am running a FEM with Nastran and get this error ***USER FATAL MESSAGE 1250 (BIOWRT) STATUS = 112, FILX = 1, LOGNAME = SCRATCH NS BUF3 = 8192 BLKNBR = 749585 Anyone know what's the problem and how can I solve it?

    Dear all, I am running a FEM with Nastran and get this error ***USER FATAL MESSAGE 1250 (BIOWRT) STATUS = 112, FILX = 1, LOGNAME = SCRATCH NS BUF3 = 8192 BLKNBR = 749585 Anyone know what's the problem and how can I solve it?

  • Can someone send me Free DLM example of Nastran Test Problem Library (TPL folder)? I don't have this folder as I use the Student Edition.

    Can someone send me Free DLM example of Nastran Test Problem Library (TPL folder)? I don't have this folder as I use the Student Edition.

  • Temperature dependent CTE's in SOL 101

    I like to calculate a thermo-mechanical loadcase. The starting temperature is 20°C and the end temperature -80°C. The CTE's of the materials are temperature dependent. Is it possible with SOL 101 that the temperature dependen CTE's are considered over…

  • Creating Nastran Database using SOL nifimp_v22: Failed but continue

    Hi, I have a bdf which was created with Patran 2014, but my university has Patran 2016, and everytime I try to import it I get the error Creating Nastran Database using SOL nifimp_v22: Failed but continue. I feel the old formatting of the bdf is not letting…

  • Is the Exo-6 report utility broken with Nastran 2018?

    I have found the MSC Exo-6 report utility to be very helpful over the last several years since it came out in 2012. It still seems to work fine with all versions up to and including 2017. But it crashes when I try to open an f06 file from version 2018…

  • What is SYSTEM(216)?

    I recently started using Patran/Nastran 2018. I just noticed that my nastran input files now have the following command at the top: NASTRAN SYSTEM(216)=YES. I do not recall seeing that with previous patran/nastran versions. Unfortunately, I cannot find…

  • H5 output file does not show any subcase names when I load into Patran.

    Right now I must use op2 or xdb format because those formats include the subcase names. For some reason I get no subcase names with h5. I just get the subcase number but no names in Patran. Please let me know what I am doing wrong. Surely someone at MSC…

  • SYSTEM FATAL MESSAGE 3003 (GKAM)

    Does anyone know this Message ? SYSTEM FATAL MESSAGE 3003 (GKAM) ATTEMPT TO READ PAST THE END OF A LOGICAL RECORD IN DATA BLOCK DITS (FILE 105) IN SUBROUTINE PRETAB Comming from a nastran run, with Nastran Version 2017.1.0-CL479603…

  • In the linear statics solution sequence (101), is there a way to get the results of each subcase to feed into the following subcase, similar to the way it automatically happens in the non-linear statics solution sequences (specifically 106)?

    In the non-linear statics solution sequences (specifically 106), the results of each subcase feeds into the following subcase. Is there a way to replicate this in the linear statics solution sequence (101)? In 101, the subcases appear to be quite independent…

  • Solving Dynamic Problems Using Eigenmodes from NASTRAN

    Dear community, I am looking for the examples of using modal analysis (SOL103) results externally (in matlab, python or any other language), for example for frequency response analysis. It is understood that Nastran can do it (SOL111), however…

  • Extraction of Element forces from OP2

    Hello, I would like to know, if there is a way to extract the element forces from OP2 file with out using Patran or printing in f06. I got OP2 files of more than 7GB, it's taking several minutes to load the files in patran and to extract the…

  • How do I define MATVP with TABL3D?

    Hello, When MATVP was defined for elastic-plastic creep analysis, I used TABL3D0 and get an error below after running MSC.Nastran V2018.0.1. *** USER FATAL MESSAGE 9994 (BULKPM) TABL3D0 with ITID=20 near line 9624 User information…

  • SYSTEM WARNING MESSAGE 6065 (DBC); Tech Articles ID KB8019399 Reference Question and MSC's answer below in "Details" My follow-up question: What is the recommended avoidance if Nastran DBCFACT = 4 is already being used?

    Tech Articles ID KB8019399 Status: Published Published date: 08/13/2010 Updated: 07/12/2014 Reported In: MSC Nastran Abstract (Question) How one can avoid this error when running Sol 111? 0 SUBCASE 1 ***…

  • Usuage of DMAP with Nx Nastran

    Hello, I would like to know, if it possible to use the DMAP (MSc Nastran ​- To generate the mass matrix for the combined - physical and reduced model) with Nx Nastran . I am using the DMAP with Nastran 2017.1 It would be helpful, if some…

  • Required cards for SOL 109 and SOL 112 with Acceleration as input using SPCD

    Hello, Thanks and in advance. I want to apply acceleration as input load in SOL 109 and SOL 112. My system of unit is density (T/mm^2), modulus (N/mm^2). My acceleration data is in g's. I would appreciate a template of…

  • 103 solution with EXTSEOUT

    ​My 103 solution works fine and gives me eigenvalues, but, when I include "EXTSEOUT(STIFFNESS,MASS,EXTID=5100,matrixop4=26)," it gives me the matrices I want, but not the eigenvalues.
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