MartinaC 2 Report post Posted May 20 Hi everyone, I modeled an element in Altair Inspire, then I imported it in HyperWorks as a Solver deck. The mesh is created by Inspire, is there a procedure to refine the mesh o remesh the object? I tried to remesh some volumes, but the longest side of the FEs was not divided. Bests Martina Quote Share this post Link to post Share on other sites
Rahul R 316 Report post Posted May 22 Do you want to keep mesh of two layers across thin region? Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted May 22 I want to reduce the dimension of the FE in some regions. I am modeling a tensile test coupon with PSOLID card image. Quote Share this post Link to post Share on other sites
Rahul R 316 Report post Posted May 23 If you want to change the dimension of FE model then you could make use of morphing technology in HyperMesh.Please share the screenshot of the region you want to make changes. Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted May 24 Ok, thank you. Could you explain me the procedure or indicate a guide or some tutorials, please? The region is more or less the included one inside the white line (hw). I would like to obtain a gradual refinement like in the second shot (hw1), or something like the third image (hw2) Bests Martina Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted June 22 Where I can find information about imported meshes and modification of them? Martina Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted June 22 Don't make TET mesh with this simple geometry!!! Here's the best way to go: Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted June 26 Thank you. I used tetra mesh because that was only the beginning of the work. Now I have an hollow steel joint to be modeled as AM metal. I have to use 3D element mesh. The existing mesh has been generated in Altair Inspire to perform optimization, but I am not able to refine the mesh woth the refinement box. Bests Martina Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted June 26 @MartinaC : Is this TET4 or TET10 mesh? Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted June 27 I think tet4, because Altair Inspire SolidThinking create first order elements. The mesh was created due to optimization procedure in Inspire, then imported in HyperWorks. Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted June 27 TET4 mesh with only two elements on thickness? Hmm, please don't do analysis with this mesh, because you will got bad results. Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted June 27 This is the reason why I want to refine it, but I am not able to refine it. Can you explain how can I do it? Keeping in mind this is a model imported from Inspire. Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted June 27 Could you share this model? Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted June 28 Attached the model and the session. Nodo.hm Nodo.mvw Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted June 28 How do you assemble the central part with others? Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 1 They have frozen contact surfaces generated by Inspire: elements with distance were created with Rhino, then the IGES file was imported in Inspire, the elements moved to have contact and the contact surfaces set to freeze. The obtained model was optimized and exported as .fem file, then imported in HyperWorks as Solver Deck. Quote Share this post Link to post Share on other sites
Rahul R 316 Report post Posted July 1 Do you have actual CAD model? In HyperMesh 2017 and 2019 we have some good features for 3d meshing.Fuse and 3d tet mesh with layers across thin region would be useful in your case. Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 1 Thank you! I have another proble.: I used STEP file to define the internal region of the node (which is the optimized one), then I imported as geometry from CAD model the other parts. I checked the edges and useed the edge edit equivalence to obtain a close surface. Then I used 2D mesh in the region that require a finer mesh, then I create the tetra mesh. I impose a simple tensile non-linea quasi-static load and run the analysis: the software writes "Ready", but the Optistruct window does not appear. I used the same procedure (except fot the STEP file) for the coupon bar, and that analysis run. I really do not know what to do. Bests Martina Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 2 I attach model and session, if needed I can attach the .fem file. I thought to some problems: - the internal surface built from STEP file (created using the option "skin" of surfaces) generates problems with the geometry imported from Rhino. - the number of elements and nodes is too high for the computer I am using. - closed surfaces are requested and contact surfaces must be defined, instead of using open surfaces (I used them to ensure the tetra mesh generates with the same pattern of the adjacent body. In the model there are empty components because they are the layers from the geometry (Rhino). I defined the 2D mesh of some surfaces of those layers (to perform the mesh in an easier way), then I moved them in a unique component (Nodo) 07.01_2.mvw 07.01_2.hm Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 2 I tried to define the model entirely from STEP file, exported from Inspire, but there is the same problem. Here I used only the central part to check the mesh procedure: all surfaces were attached to solids (closed surfaces). I delete the external parts and meshed only the central one. A 2D mesh was created, than the tetra mesh. All 2D elements were delated after tetra mesh was generated. Bests Martina 07.02_2.hm 07.02_2.mvw Quote Share this post Link to post Share on other sites
Q.Nguyen-Dai 293 Report post Posted July 2 I see you got not-bad tet mesh. So where's your problem? Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 2 The problem is that when I launch the non linear quasi static analysis the analysis does not begins: at the bottom of the window there is the written "Ready", but the Optistruct window does not open. Quote Share this post Link to post Share on other sites
MartinaC 2 Report post Posted July 12 With my professor we thought the model was numerically too complex to be analyzed. So we simplified the model with a scheme and analyzed its behavior. Thanks for your support Martina Quote Share this post Link to post Share on other sites