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...
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...
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...
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...
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...
