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Found 8 results

2. ## Questions regarding NLGEOM analysis

Hello, in my analysis of a curve-drive-part is a rotation as SPC, solids for the curve-part (red) and a rigid-spider (blue) to transfer the rotation displacement to the solids. I use an NLGEOM-analysis, because i want to simulate the contact between the other parts (not in picture) and the curve-part. In this analysis the curve-part shows a strange deformation and the contact force is going very high. There is no constraint or force, that explained the deformation. Attached filses: Topf_Start_1 - front view with a distance measure of 211.666 Topf_Start_2 - side view Topf_End_1 - front with a distance measure of 201.110 Topf_End_2 - side view It is a model in optistruct, but for the solving is radioss used, because the large sliding contact. I want to understand possibly failures in the model. greetings Pierre
3. ## enforced displacemnt in a local csys with NLGEOM - possible bug

Hi, I tried to model the pretension for a NLGEOM analysis with enforced displacements in a local csys. If the pretension is not followed by an another loadcase, the results are OK, if there is a follower loadcase the results are not the same as before and wrong. Attached you can find a test model (with pretension with and without an additional loadstep). Nodes id. 1 and 2 are the ones with enforced displacements in the local csys id 4. Please take a look at the displacements for the pretension in both cases. Is this problem known? Is there a workaround for this problem? Thank you. Best regards, Szilard Balazs example_NLGEOM_pretens_load.zip
4. ## Non-convergent nonlinear iterations

Hello! I really need your help. whenever I implemented OPTISTRUCT, I got " Non-convergent nonlinear iterations for subcase 2" result. I set hyper-elastic material, and pshellx for 2D design. Also My load collectors are, SPC/LOAD/TABLED1/NLOAD/NLPARM, and I set load step NLGEOM I don't know why I couldn'y get nonlinear analysis result in OPTISTRUCT. My material is the example of MATX62.. I attached My entities and NLPARM screen-picture too Please give me some advices Thank you, Best Regards,
5. ## Contact/Enforced Displacement

Hi, I've been trying to find the force required to create an interference fit between two parts. I'm fully constraining one of them, and placing an SPCD upon the other. The contact between the parts is a sliding one (I've tried different values of friction, but nothing seems to help). I'm using a non-linear implicit analysis. The solver gets quite far down the line, but then crashes at some point because it cannot converge. One of the parts begins to deform (as it is supposed to), but then the solver doesn't get any further. Chamfering the goemetry to avoid sharp edges helped some, but not enough. Any thoughts, or a location where I can share a large .fem file? Thanks, Jai
6. ## nonlinear static or dynamic optimization

Hello, everyone ! Can anyone share some tutorials or examples on nonlinear optimization in which the analysis keyword is NLGEOM, IMPDYN or EXPDYN ? Thank you in advance !