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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

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...

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...

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...

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...

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...

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

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...

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...