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Found 669 results

  1. Does anyone know how to make the stress change with each displacement step in an optistruct simulation? Currently when I have it show me the stress heat map, it doesn't change at each displacement step.
  2. Dear Colleagues, I have a problem with heat transfer analysis. I am experienced with ANSYS thermal analyses and at the same time I am working with HyperWorks for a couple of years but it is my first more complex thermal problem that I am solving with HW. My problem is, I don’t know how to set properly the analysis Load collectors and steps. What I want to do: I have a part of a machine (rotating lathe table) which is heated by heat generated in bearings and motor. According to the norms I have performed on machine test and I need to reply this with FEA to obtain a model on which I can test construction changes. The machine has been working in a few timesteps, with different parameters. My question is how to set the Loadsteps to obtain a few substeps which are performed one after the other under the terms of the previous. Bellow I posted a shorten table of the experiment. The heat flux has been calculated analytically. Time [min.] heat flux [W/mm2] 0 – 30 hf1 30 – 60 hf2 60 – 120 hf3 ... After that I want to obtain the temperature distribution on the table and its deformation (displacements).
  3. I attempt to go through Toplology Optimisation with relative displacement (in x, y, z) as constraints and loadcases. SoI need to select all the nodes displacements at certain cross sections, where there is the only path transfering force to design area. I am new to optistruct and hyperview, I just noticed it is possible to select cross section and read also output every nodes' displacement in Excel. My question is, does it work in this way? and if yes, How should I input these data (should be more than hundred nodes) into Optistruct as an easy way? A tutorial would be so appreciated! Cheers!
  4. Hello, I have performed a transient thermal simulation with OptiStruct. I want to get the surface average value of temperatures in a surface for all the time steps, but I don´t know how to get it. Do you have any idea of how to do it in HyperView? Thank you very much Juan Iradier
  5. Hi guys, i have some questions and problems with the tutorial OS-T 1600. 1. First question: What is the best way to start a FSI-Simulation. The way in the Tutorial, or the Co-Simulation Tool (Picture 1) (Picture 1) 2. Second question: When i start the FSI-Simulation i get an error (Picture 2). (Picture 2) I think i use the wrong hostname. Could anyone explain, what i should insert in the green field (Picture 3) (Picture 3) Thanks Michael
  6. Hi everyone, I am modeling a 3D hollow element made by more components in Hypermesh to conduct NLQS analysis with Optistruct. My system is symmetric and I want to know if there is the possibility to tell the software that the unmodeled part is the mirror of the modeled part, so that it considers the constraints due to the symmetry. I know the software allows to reflects elements, but I would like to not works with too many nodes. I attach pictures: 1 is the modeled/discretized part; 2 is the entire system (modeled, unmodeled parts) Thanks Martina
  7. Hi everyone, I am simulating a tensile test with Optistruct. The analysis is NLQS and the material is isotropic. I set the analysis as proposed in the eBook "Introduction of Non linear finite element analysis using Optistruct", section 3.1.5 Tutorial: Small-Strain and Large-Strain Plasticity in a Test Coupon. I would like to understand how to set the CELAS1 element in order to use it for the building of the force-displacement output curve. I created the element, but the output curve results flat, so I think the problem is the Set. Attached is the .fem file, is usefull. Bests Martina MODEL2_surfs_JarvO1_NLQS.fem
  8. Hi Rahul I am doing linear static analysis on a plastic injection mold assembly. Clamping force and constraints are as following Pressure 54 MPa (This is the maximum pressure of molten plastic when it enters the cavity) is applied on core and cavity as shown below The problem is that, the maximum displacement is much more than what it should be in real case (It is almost 10 times more). I have used SI units and I checked material properties, units look right. I don't know understand why I get this result. I have used bolt connection, RBE2 and also FREEZE contact to define connection between parts. I sent you the model via your Dropbox link. I appreciate if you can spend some time and check my model and let me know what is the problem and why the maximum displacement I got is much more than the reality.Thanks a lot.
  9. How can we prove Topology Optimization method by Analytically/ Mathematical modelling. If not complex any Simple structures to show results matching with CAE techniques. ?
  10. Hi everyone, I am simulating a tensile test of a homogeneous isotropic material, according to the coupon bar example in "Introduction of Non Linear Finite Element Analysis using Optistruct". I imported a different material and the coupon bar geometry is a bit different. I do not understand why the numerical force -displacement curve decreases after the yielding point, while, for example in the ebook, it follows the input trend. I though the possible problems could be the definition of the true stress-strain curve, or the NLQS parameters NINC and NLOUT, the chosen finite elements (tetrahedral; I used this type because I have to calibrate the material to perform analyses on more complex geometries). Can anyone find the problem? I attach the .fem file (ModelB_prova_NLQS). In additiion I attach a model that behaves as expected (Model2_surf_prova10_NLQS ModelB_prova_NLQS.fem MODEL2_surfs_prova10_NLQS.fem
  11. Hello everyone I have a quite complexe geometry to mesh. For this I have applied 'Check Elements Quality Index', where it shows the quality of the elements. Now I would like to know, if there is a possibility to cut the model, to be able to see the inner contours and how the elements looks there. Then I could have a better overview of the situation and know what to change for the mesh. I thank you in advance for your help!
  12. Here is my .hm file. I would to connect the design and non design component as a whole but i still do not manage to do it. Please help me guysss !!!! TRY.hm
  13. I am working on composite analysis using optistruct solver. While solving I got error "program stopped due to element quality check." what should be the solution for this. whether I have to remesh again or is there any command by which element quality criterion gets automatically satisfied. Thanks.
  14. hi everyone, I have run my model but the software do not create .h3d file best regards hi moderators, r13.fem
  15. Hello all, I get error code below after a converged NLSTAT analysis, hence result files could not be written. Same problem occurs after restart run of last increment of that analysis on different workstations (there is plenty of disk space by the way). *** Nonlinear solution has converged *** (Scratch disk space usage for starting iteration = 2679 MB) *** INTERNAL PROGRAMMING ERROR *** in file "virfile.c", at location # 318. Attempt to read past file size ************************************************************************ OptiStruct error termination report printed to file "TRS30_YS_R4-TYX_RBE3_restart.stat". NLSTAT_run.out NLSTAT_run.stat
  16. Hey! Is there any way to scale single loads, load collectors or load steps in HyperMesh using Optistruct as the solver? Ich can't really find anything. All I found was "use the LOAD controll card". I found it via 'controll cards -->global_case_control --> Load' but it seems that this one just gives the Loadcas ID.
  17. Hello everybody, I have a problem with optimizing in hypermesh (optistruct). I get the following error message: *** ERROR # 5617 *** The SUBCASE ID in ATT1 field of DRESP1 1 does not refer to a modal FRF subcase. *** Run terminated because of error(s) in the input data. I actually did the same as in tutorial OS 3010. I hope you can help me My model is attached pangelo.
  18. いつもお世話になっております。 只今、CFRPパイプに部分的に肉盛り積層したような物を解析しています。 Optistructにおいて断面係数および断面二次モーメントは計算出力出来ますか。 よろしくお願いいたします。
  19. Hi All, I am trying to run an analysis on a pipe section subjected to torsion. When I run the analysis I get the below message ***There were 4 error messages during input processing*** The first message is repeated below: *** ERROR # 772 *** It is invalid to use a free grid as an independent grid in RBE3 data. Free spiders are not allowed to be independent grids in RBE3 data. RBE3 id = 4903 free grid id = 9634 weighted components = 123 You should remove this grid from the RBE3 data. *** Run terminated because of error(s) in the input data. Does anyone have any advice to resolve this error? Thanks in advance, Luke
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