Search results for query: *

Hi, I have been trying using Control Mesh -> Size along Curves. The problem is that FEMAP sees two curves at an edge where two parts meet (contact region), i.e one curve for one part and one for the other part. Especially, when you apply biased curve devision, the mesh continuaty between the...

By the way, it would be very helpful to have an option for a sort of autmatic mesh refinement near contacts. There is an option for automatic contact detection between various parts in an assembly, but automatic mesh refinement near these contacts would make the whole thing much more complete...

Hi, I have been busy doing some contact analyses, however each time I refine the mesh by specifying the maximum element size, the maximum contact pressure increases. Does somebody know any tutorial or example for FEMAP on how to refine the mesh at a specific location. If I specify the maximum...

OK, I will try to keep my models small enough to avoid problems with memory menagement. Usually these large models are even not necessary. I may try to change settings which you described, when get a little bit more familiar with the structure of the .dat file and other Nastran files. About...

Correction: The number of degrees of freedom for the smaller model is 890000 instead of 330000. So the model that woukd not run must have contained 2 or 3 mln DOF's.

Hi, The problem I had disapearred when I removed some of the features which do not make a big difference for the structural analysis. This resulted in a reduction from approximately 160000 tetrahedral elements to a rough 90000 elements. I run Windows XP 32-bit on a machine with following...

Usually I don't set up anything in Output Requests. I leave it as it is. It usually worked but that's now a different story. I will have a look at the Output Requests, maybe I can adjust something there properly. Thanks a lot Ronald.

Hi Ronald, There is a f06 and op2 file. However the results should automatically be loaded after the analysis is completed. I also noticed that the Nastran message window does not say "Boundary conditions applied/Linear static analysis started and completed" Here, obviously something goes...

I forgot to mention that I am using Nx Nastran with FEMAP.

Hi, I am running a static linear analysis witgh something I imported from Pro/E as .stp file. The model involves pressure loads and simple contraints such as fixation of a surface by method: model -> constraint -> nodal and then a I choose the surfaces which I want to fix. The pressure load I...

Thanks a lot for the comments. I know that the needs of FE user can differ a lot. But as far as the versatility of various Nastrans is concerned, I am getting the impression that NEi covers a lot. I make this statement based on what I have read and seen, mostly on Nei website itself...

Hi, I also have some other questions: 1. Is it possible to visualize the nodes of elements? I usually inspect the automatically created mesh by observing the elements, but I would also like to see the nodes and their locations across the (edges of) elements. 2. Is it possible to refine the...

Thanks all you! Selecting surfaces by groups is most appropriate indeed. Adnan

Hi, I am having frequently the problem of high stress concentrations. It has nothing to do with boundary conditions, it's the presence of sharp corners and sharp edges that causes the problem. Applying rounding features does not help. I have also tried to use options like "Detailed fillet...

Hi rb1957, The effect of the pressure on the internal stiffeners is partially compensated indeed. However, there are some parts of the stiffeners on which the pressure acts only from one side, however these have relatively small surface area. Excluding these when applying pressure would...

Hi Thomas, What I mean by selecting multiple surfaces is the following. Rather than selecting surfaces one by one (thus individual surfaces), in many CAD programs you are often given the option to select more than one surface. In Pro/Engineer for example it is possible to select surfaces by the...

Hi, Is it possible to select multiple surfaces at once within FEMAP? For example, when I want to apply a pressure load within a cylinder which has some other faetures on the inside, which means that there are multiple surface of the interior of the cylinder. You can always select the surfaces...

napoleonm@ Plastic materials (polymers) are not hyperelastic. Polymers and rubbers are modelled differntly. Polymers are viscoelastic (strain rate dependent) whereas rubbers are hyperelastic. So the rubbers can undergo large deformations without loss of strain energy. With polymers and plastics...

brep@ Nonlinear elastic material models (derived form the strain energy function) are often referred to as hyperelastic material models, indeed.

Wildfire 4 will indeed support nonlinear elastic material modeling, meaning there will be the possibility to model materials capable of undergoing (very) large deformation thereby not exceeding the limit of yielding, like rubbers seals. Plastic material behaviour is scheduled for Wildfire 5. I...