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  • I'm trying to use a PolyUMod model (TNV) into Marc Mentat 2024, I followed the steps showed in the PolymerFem Tutorial but Marc shows me the Error 13.

    I'm trying to use a PolyUMod model (TNV) into Marc Mentat 2024, I followed the steps showed in the PolymerFem Tutorial ( How to Use a PolyUMod Material Model in MSC Mentat ) but Marc shows me the Error 13. Here's my TNV model file text: ModeloTNV1…
  • Help Needed: Stress/Strain Values at Element Centroid in Marc Mentat

    Hi Community, I hope you're doing well! I'm working on a project in Marc Mentat and need a little help. I'm trying to figure out how to extract stress or strain values at the centroid of an element. I do have the element ID and the stress/strain data…
  • Hello, I run two similar NASTRAN solid composite elements models with sol 400 and LNSTATICS and I obtain different stress results. Why is that? Below are details about the models

    The only difference between the two models is that for one, I specify a failure model thanks to "MATF" and ask for the strength ratios with "PARAM,SRCOMPS,YES". Doing that, I obtain a 40% higher stress. I have made sure that SR>>1 so that…
  • How do Rigid Elements behave differently in SOL106 versus SOL400?

    How do Rigid Elements behave differently in SOL106 versus SOL400?
  • Nonlinear solution ends in FATAL error when gap elements start to close

    I am using GAP elements in a nonlinear static solution to analyze the deflection of a clamp as it presses down on ceramic block. There are discrete faces that contact the ceramic and I defined gap elements between them and the ceramic. As I increment…
  • I created a linear FE model and I ran it with SOL400 with NLTRAN, the model converged. I do not understand how the model converged if I ran a non linear analysis? I also turned off the large displacement.

    Can a linear model run in a non linear analysis. If it converged does that mean the simulation result might be correct?
  • speed up SOL106 analysis?

    Currently it takes about 1min to complete one analysis. however, i have over 40k bdf files. Is there a way that can significantly reduce the time? The Nastran Command options dont seem to help much. my bdf file is 16.5mb large. i cant upload…
  • What solutions should I use to run nonlinear material with inertia relief?

    What solutions should I use to run nonlinear material with inertia relief?
  • I have an issue where applying either a total load or force on a model with frictional contacts causes large displacements at the first time step (2% of load) and it doesn't converge. It does work with an enforced displacement however.

    I have an issue where applying either a total load or force on a model with frictional contacts causes large displacements at the first time step (2% of load) and it doesn't converge. It does work with an enforced displacement however.
  • Correct Arc Displacements for a Large Rigid Body Rotation Problem

    I am attempting to get correct displacements for a simple beam with an enforced rotation applied to one end -- please see the attached .dat file. "Correct displacements" are ones where the free end of the beam moves in an arc, not in a line. In my case…
  • Modeling geometric imperfections on a FE model.

    Hello, Is it possible to supply scale factors corresponding to the scaled shapes of each SOL 105 mode so as to introduce geometric imperfections to the FEM? I know of the long ended way of doing this using MSC.Patran (using fields…
  • Stress recovery from nonlinear FE_PART

    ​Hi All I am running a nonlinear FE_PART model and would like to obtain the stress and strain values along the beam. Essentially I am just looking for the point of maximum stress. I am not sure if there is a post-process step I am missing,…
  • Unexpected deformation in nonlinear analysis with contact

    Hello, I make nonlinear analysis with touched contact. My model made by 3d shell elements on Marc Mentat. I have force on shell body which bends and have contact with other shell body. My contact is between two deformable shell with two shell…
  • Extract pre-loaded nonlinear stiffness matrix using EXTSEOUT in SOL 400

    I have been successful in extracting pre-loaded nonlinear stiffness matrices using EXTSEOUT in SOL 103 restarting from a SOL106, such as suggested in the topic: forums.mscsoftware.com/.../showflat.php Now, I need to do the same…
  • SOL 128 FATAL message

    When running SOL 128 - nonlinear harmonic frequency solution - I get a FATAL message that there are no nonlinear degrees of freedom defined. How do I define these?​