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  • what is the difference between RBE1 vs RBE2?

    what is the difference between RBE1 vs RBE2?

  • I used the EXTSEOUT (ASMBULK EXTID = 15 DMIGPCH) to extract mass, stiffness and viscous damping matrices as pch file. The pch file contains KAAX and MAAX entries showing elements of stiffness and mass matrices, but there is no BAAX for damping.

    I used the EXTSEOUT (ASMBULK EXTID = 15 DMIGPCH) to extract mass, stiffness and viscous damping matrices as pch file. The pch file contains KAAX and MAAX entries showing elements of stiffness and mass matrices, but there is no BAAX for damping.

  • How does NODYNRSP do its thing?

    Does anyone know how the NODYNRSP option of the RESVEC command do what it does? I haven't been able to find any documentation on this detail. My (wild) guess is a low pass frequency dependent damping is applied to the modes associated…

  • can we compare participation values of different iterations in DOE using SOL112?

    can we compare participation values of different iterations in DOE using SOL112?

  • can we compare frequency values for different iteration in DOE by SOL103?

    can we compare frequency values for different iteration in DOE by SOL103?

  • Is it possible to run linear gap based on SUPORT card and linear contact based on BCONTACT in the same solution sequence?

    My Goal is to combine the benefits of BCONTACT based contact formulation to efficiently model Shell-to-Shell contact with the benefits of linear gaps, modelling a fastener that can only take tension. If it is not possible, how to deal with 1D Elements…

  • Diagnose stalled analysis.

    I have a large (~8 million DOF) model that I need to run static and modal solutions on. My first attempts have reached the point of applying external loads for the static case and, completing the solution for modes for the modal analysis. At this point…

  • What does Linking coefficient in AELINK entry define?

    What does Linking coefficient in AELINK entry define?

  • NASTRAN SYSTEM(216)=YES

    I am using Nastran 2018.2. I see that Patran put this system(216) command into my bdf file. However, when I look in the QRG for 2018, there is no entry for system cell 216. So what does this undocumented feature do?

  • Calculate stresses from thermal static load using temperature dependent materials

    I have an optical system with temperature dependent properties on the glass and epoxy. I want to evaluate the stresses in the optics due to different temperature environments. Would a nonlinear static solution using subcases to step from room…

  • Equivalent Plastic Strain, getting strange output (SOL400)

    Getting values > 1e37 for equivalent plastic strain in my results. This is with higher loads. At lower loads, the values are in the right ballpark, but contour looks odd (compared to all other results). Meanwhile, all other outputs seem reasonable/correct…

  • How to carry out nonlinear iterative contact subroutine in SOL101 only on subset of subcases if possible?

    I want to run contact subroutine in a linear elastic SOL101 and therefore defined the cards 1xBCONPRG with ICOORD=1 (Stress free Initial state), ISEARCH=1 (Search only from Slave to Master) 2x BCBODY1, both 3D and Deformable 2x BCPROP 1x BCONECT…

  • Rigidity at sol 111

    Please explain me, how to calculate stiffness/rigidity from frequency response analysis (sol 111)

  • Is there a way to have a single MAT card for both structural and thermal properties? I currently use two different include files of MAT1 lines and MAT4 lines for if I'm doing a structural or a thermal run, but I'd love to not bother switching.

    Is there a way to have a single MAT card for both structural and thermal properties? I currently use two different include files of MAT1 lines and MAT4 lines for if I'm doing a structural or a thermal run, but I'd love to not bother switching.

  • How to get max/min envelope printout over a range of load cases or subcoms

    I am a big user of the powerful maxmin command that allows me to get all the output I need in the f06 file. This allows me to quickly see the max/min quantities I am interested in for each loadcase or subcom. However, I often need to get the enveloping…

  • What is the latest, most stable, version of MSC/Nastran (with least known bugs)? Can you please supply the full version number (eg MSC/Nastran 2019. xx.xx).

    What is the latest, most stable, version of MSC/Nastran (with least known bugs)? Can you please supply the full version number (eg MSC/Nastran 2019. xx.xx).

  • How to use MATSMA in structural analysis for shape memory alloys?

    Hello, I am trying a 2D structural analysis for shape memory alloys. So I think I will use “MATSMA”, which is a material property for shape memory alloys. Would you know any tutorial or examples about shape memory alloys in Nastran2019? …

  • Is there a script available to convert a BDF file from the large NASTRAN format to the small format? I have several BDFs used as INCLUDE files to a large nastran deck but they are all in the Large format which is not necessary or desirable. Thanks.

    Is there a script available to convert a BDF file from the large NASTRAN format to the small format? I have several BDFs used as INCLUDE files to a large nastran deck but they are all in the Large format which is not necessary or desirable. Thanks.

  • How to request op2 for Each NASTRAN Modules (Update from v2018) ?

  • How do you solve System Fatal Message 3200 (BDYINC) Logic error 1?

    How do you solve System Fatal Message 3200 (BDYINC) Logic error 1?

  • Duplicate element IDs in the same deck runs without error. Why?

    I have a Sol101 analysis deck that has a set of element Ids that are duplicated. A set of CTRIA3 /CQUAD4 elements have been given the same ID as that of another set of CBEAM element. I am not seeing any fatal error or warning in…

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

    Hi, up to now, I've applied the command EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH) to get the matrices as a byproduct of the superelement reduction process. This is ok for models of moderate size. However, this approach…

  • SOL103で、変形の見られない固有モードが同じ周波数に複数出力されます。 要因と回避策を教えてください。

    このモデルの一部を削除すると、この現象がなくなります。 削除した部分のみで計算しても現象は現れませんでした。 また、これまで同規模の同内容の計算をしていますが、表れたことはありませんでした。 このモデルはBSURFを用いています。

  • Help on using CSHEAR - Extensional stiffness

    I am trying to do modal analysis of spar. I have modeled flanges using CBEAM and web using CSHEAR elements . I got modal frequencies but I am not sure if they are correct. I found a technical article which tells to use CROD/ extensional stiffness on all…

  • How to fix a bolt (cbar element) at current length after pre-tension load application on bolt

    How to fix a bolt (cbar element) at current length after pre-tension load application on bolt
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