MartinaC

Of course. Now I tried to add some other support to the element: the analysis is running. I will see if it converges when it will end. Simm2D_full compression_NLQS.out

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

Hi everyone, I am performing a non-linear quasi-static analysis on a system made by elements with different materials and geometry. I attach the files. The system has an SPC for dof 1, 2, 3 at the bottom part and compression pressure on the other 3 sides. The problem is that the analysis does not converge because of error 4965. Is this a problem of the load pattern or load type, or a problem of analysis parameter setting? Before this trial I performed on the same model a non-linear quasi-static analysis of simple tension along x axis imposing a displacement on the right side of the system and an SPC for dof 1, 2, 3 on the left side and the analysis converged. After this I imposed the displacement also along y axis, but it didn't converge, so I tried with forces, and then pressures, but the analysis didn't converge. If the problem is the load setting, the definition of an envelope of the vertical loads with the horizontal loads could give good results? Bests Martina Simm2D_full_compression.hm

Thank you Rahul!

Hi everyone, I am modeling a system composed by solid elements that are welded together. I want to develop tetra mesh from 2D automesh at the contact surfaces, but when I create the 2D mesh on the adjacent surfaces they are different and this leads me to an incorrect 3D mesh because after tetra meshing I equivanlence the nodes on the adjacent surfaces and the mesh elements fail. I use "keep connectivity" when I create the 2D mesh, but sometimes the meshes are equal, sometimes they are quite different. Why? What can I do?

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.

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

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

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

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.

Attached the model and the session. Nodo.hm Nodo.mvw

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.

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.

Thank you. Martina

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