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Recent content by vanji1

  1. vanji1

    If I want to construct myself a geometric stiffness matrix induced by a pre constraint with finite element modeling

    Dear all I would like to know how to generate a geometric stiffness matrix induced by a preconstraint. Once I have the geometric strain tensor, How do I proceed for implementing this using Voight notations ? In fact I find approximation formulations in the literature. Sibcerely yours, Evangéline
  2. vanji1

    Question about NASTRAN execution / installation

    Dear all, I had a question concerning the execution of NASTRAN. It is installed on stations which have 96 cores. Nevertheless, when I execute a simple SOL103, the program works very well but occupies only 100% of one core. (1) Is this a problem of installation ? (2) Are there specific...
  3. vanji1

    Question Nastran viscoelasticity with memory

    I would like to perform an analysis (free response) using a viscoelastic with memory model. Is it possible with Nastran ? I have a structure with solid finite elements with 8 nodes. If I understand well, I should use MATVE for the definition of material properties ? I would like to define Young...
  4. vanji1

    Nastran limitation/configuration

    I am currently using a SOL103 with the following lines in the main program below. The program does not work. I have an error message (.log in attachment) and I do not understand what is wrong...
  5. vanji1

    DMAP Nastran Centrifugal Force

    Dear DG, Thank you very much for all these informations. Thanks to you I understand that the structure does not rotate so the stiffening effects only comes from the linear static calculation with the centripetal force due to RFORCE, which I did not understand. Thank you also for the trick that...
  6. vanji1

    DMAP Nastran Centrifugal Force

    Hello I have a finite element model of a bladed-disk and I put a centrifugal force in order to take into account the modeling the rotating speed and the stiffening of the structure (In order to calculate the eigenfrequencies). I have no problem with the Nastran calculation but I would like to...
  7. vanji1

    Meshing Patran from full CAD to generating sector

    Hello, I have a question. I would like to use a CAD model of a fan propeller found in grabcad. I can import the model in Patran. The problem is the following It is a full CAD, and ideally I would like to have the generating sector (structure with cyclic symmetry). And I would like to get a...
  8. vanji1

    Nastran reduced shear integration

    Thank you for your response. I understand better the point. Nevertheless, what I am exactly looking for is the numerical method used by Nastran for reducing the stiffness. In the manual, this is not very clear, they are talking about underintegrating some terms. Nevertheless, this is not true...
  9. vanji1

    Nastran reduced shear integration

    Hello In Nastran, for CHEXA elements, what is reduced shear integration? Sincerely yours,
  10. vanji1

    problem with DBALL file

    Hi everybody I have the following question. I am running a Nastran Job and I observe a huge amount of data in the dball file. Note that I do not have any memory space problem (ram+disk). USER INFORMATION MESSAGE (pgm: nastran, fn: estimate_job_requirements) Estimated DOF=268803...
  11. vanji1

    Nastran reduced shear integration meaning

    Hello everybody, My problem is the following. I am using MSC Nastran for finite element analysis. There are several options for performing the finite element analysis in term of Gauss integration for CHEXA elements with 8 nodes. As you know, the complete integration os not appropriate because...
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