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Hello community, due to various circumstances I have to switch from Siemens NX Nastran to MSC Nastran. I used glueing operations for different purposes like edge-to-surface and surface-to-surface. Now, as I have to switch to MSC, I want to transfer these connections. I read a bit about the MSC...

Hi all! Currently, I want to identify the face pairs which depict interfaces between 2 or more components in NX using NX Open. These faces are faces which are coincident/touching with a face of the other body. For this, I already did some research concerning existing methods, as there are for...

So, to sum up my latest information. I analysed a simple CQUAD4 and I realized that varying Young's Modulus or Plate thickness IS influencing also the in-plane rotational DOF. So my previous statement that changing the young's modulus is not influencing these stiffness matrix entries but the...

Thank you all so far for your responses. @gravityandinertia : Okay I think i used "analytical" in a wrong way. To summarize it: I have a structure (does not matter how it exactly looks). I want to stiffen it by factorising the e-modul by 10%. The other approach I want to compare to, is that...

Thank you gravityandinertia. I already know something about equations of motions, and I was aware about the relation between stiffness matrix and DOF vector. My problem was that I had in mind, that the kind of element AND the kind of DOF(translational or rotational) play a role for the value of...

But the DOF of a Grid Point do have an entry in the stiffness matrix, right? So, rotational DOF1 of grid point 1 is connected to rotational DOF1 of grid point 2 (beam example).So according to my understanding, it is possible that the factors of translational stiffness and rotational stiffness...

Hi IDS, thanks for your response. for ANY type of element? I found some literature which says that the material properties are included as a "Material property Matrix". (e.g. shell elements) Where also the Poisson's ratio etc are included. For this reason I was not competely sure, if the...

Thanks for your responses. I try to set-up the matrices to check a problem using a rather "analytical" or scientific approach. I would require something that connects the young's modulus to the stiffness terms in the matrix. I want to show that varying the young's modulus by 1% is influencing...

Thank you for your response :) I guessed that, but is it really so hard to set-up the stiffness matrix of a simple 5mm*5mm*1mm shell?

Hi together, I struggle a lot with the task to set-up a stiffness matrix for a simple shell element. In Nastran, I have a 5x5mm flat shell with 1mm thickness (isotropic), represented by a CQUAD4 element. Can somebody explain an easy way to setup the corresponding stiffness matrix? I already...

Hi all! I have an issue and I don't know any reason for the problem :( I have a structure consisting of two structures connected on one edge. In the basis model which is a beam, it all seems to be OK. But now I want to go into more detail. My target body is an axisymmetric structure consisting...

Hi together!:) I have got a really fundamental problem and I would be very very grateful if someone could help me here :) I am trying to explain the reasons for the deviations of my simplified model. It's a simple rectuangular body similar to a beam with fixed constraints on one end and a load...