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Found 547 results

  1. Soumya Sanket Mishra

    Fatigue Analysis Optistruct

    In a fatigue analysis setup in optistruct solver is it absolutely essential that the component to have no life (fatigue failure) if : - static analysis stress exceeds ultimate tensile strength of material component. - load time history 1 cycle is 0 1 0 Please provide some clarification regarding this matter.
  2. LFM1995

    .out file does not exist

    Hi, First time using HyperMesh and I am following a tutorial for topology optimisation. The tutorial I am following is on pages 25-36 in the link provided. When I click OptiStruct, I do not get a message. When I click view.out, I get a message saying: '.out file does not exist.' Where am I going wrong? OptiStruct_11.0_Tutorials_(1).pdf Regards, Laurence
  3. Karthic

    Restart Error

    Hi , I am trying to restart from the end of a successful nonlinear analysis and append new nonlinear subcase with CNTNLSUB. I have included a new nonlinear subcase to the restart file, While doing so A fatal error has occurred during computations: *** ERROR # 4761 *** The restart model is inconsistent with the original one. Please compare the two input decks. Please help me to restart. Thankyou
  4. LFM1995

    .out file does not exist

    Hi, First time using HyperMesh and I am following a tutorial for topology optimisation. The tutorial I am following is on pages 25-36 in the link provided. When I click OptiStruct, I do not get a message. When I click view.out, I get a message saying: '.out file does not exist.' Where am I going wrong? Thanks Laurence OptiStruct_11.0_Tutorials_(1).pdf
  5. Amasker

    Displacement load

    Hi,I have a question, In Optistruct, how to apply a displacement load on a cylindrical rigid wall to simulate a three-point bending test like following picture? Thanks in advance。
  6. I am using Hypermesh and optistruct 17.2 version. I want to get grid point reaction forces, stresses and strains at intermediate stage so that I can plot force vs time curve, stress vs time curve. I have used GPFORCE, GPSTRESS, GPSTRAIN in global output request. Format type is H3D for all. Analysis type NLSTAT with LGDISP. Please check output file attached. *** WARNING # 6328 Loadcase 1 contains a GPFORCE output request but NLOUT incremental output isn't available for that result type. Results will be output for the last increment exclusively. I have used NLOUT card and set NINT to 10. I am expecting incremental force vs time, stress vs time, strain vs time contour in Hyperview H3D format. But I am getting contour results only at last time step (i.e. load factor 1 ). Mumps solver is used by default for nonlinear analysis. Same is case for GPSTRESS and GPSTRAIN contour results. Please help me in solving this problem. 6_MAXLOAD_trail_Forcesoutput.out
  7. All three solid (visualization) laminates are overlapping each other. Is that a problem if we do analysis as per below laminates design? please tell me the possible step to make it good? below model is a metal composite sandwich......... what connection we have to made to join it?
  8. Hi every one, I am trying to simulate a convection and conduction model and compare it with analytic results. I have a cube with K value of 100 as it can be seen in the attachment, with upper surface temperature of 40. The lower surface is exposed to free convection with amb. temp of 20 and H value of 40. The thinkness if cube is 0.35m. Analytical calculation of problem would yield lower surface temp. of 37.3 while simulation results always gets very close to ambient temperature. can anyone explain why there is a difference ? T1 = 40 K = 100 H = 40 Tamb = 20 L = 0.35 T2 = ? k.(T1-T2)/L = H(T2 - Tamb) T2 = 37.3
  9. Hi Support, I am doing Non-linear Quasi static Analysis of snap fit. Facing error MUMPS solver encountered error with code -90. please contact support and provide .out and .stat files Please help me to resolve Cradle snap-uneven- 0.2 offset.out Cradle snap-uneven- 0.2 offset.stat
  10. Amasker

    Dynamic optimization

    Hi, I recently used Optistruct to optimize the design under dynamic loading (collision), but I don't quite understand the optimization principle and process under dynamic collision. For example, I used the maximum displacement of a node as the maximum constraint, and found that the .out file is shown below.There are 20 subcases ,and 20 displacement responses,why? here is .out file. Is there any related reference tutorial? disp140mm_AMS_OPT.out
  11. Hello, I'am trying to perform a topology optimization using MMO which has a solid property for a design variable. When I run the MMO I get an error *** ERROR # 7506 *** Current version of lattice structures does not support multi-model optimization . Are solid properties not supported for MMO or is there another problem? Thanks
  12. Hello, I'am trying to create an MMO and I wanted to use the model files from OS-E: 0830 Excavator Arm to help me but they are not in my installed directory. I go into demos/hwsolvers/optistruct and there are model files there but none of the MMO files are there. Can I obtain these files from anywhere else? Thanks Aidan
  13. YaoLun

    Error 312

    Sorry.I'm confused about how to connect two components,leading to problems below. And i attach the hm file,could you help me check or correct it to run it? Thanks! Messages for the job: *** ERROR # 312 *** In static load case 1 the compliance is negative or large -1.37409e+011. Optimization/buckling analysis cannot be performed. due to possible rigid body mode. FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED). 1.hm
  14. Hello, I'am optimising a front wishbone for both the left and right of a suspension. My idea is to have the loads and boundary conditions mirrored between loadsteps however there is a spring/damper element that would effect the results. Can you deactivate/ignore elements between the loadsteps? Or is there a better way to combine the optimisation so that the component is optimised for both the left and right tyre loads?
  15. Amasker

    Composite Failure

    Hi, I made a simple optimization - about composite optimization and steel plate size optimization, the following is the input file, the result shows FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED). But when viewing the contour image, it is found that the partial area of the composite is invalid, the composite failure index greater than 1,does it mean that Optimizing the design is not feasible, Can someone give some advice?Thanks in advance。 B.FS.355.fem
  16. Arul

    Snap Fit Analysis

    Hi, Is there any tutorial deck file available for snap fit analysis using Optistruct implict (OS-E-0170: Snap-Fit analysis (CONSLI vs FINITE)) ? Regards, Arul
  17. Dear users! I have one problem when solving static analysis of 2D plate model As you can see, the setting of analysis with 3 components Var 6-1, DS, Var6-3. Everything seem be fine because the process of solving is done without any warning. But when I open results analysis in hyperwork, only component Var6-3 appear, the other 2 components DS + Var6-1 disappeared from result. Can you please give me some suggest for this problem? Thanks you in advance!
  18. Arul

    Cyclic Load

    Hi , Is it possible to apply cyclic load in Optistruct Analysis? Regards, Arul
  19. Hi, I have been trying to create 2D mesh for a component and later perform tetramesh. i first automesh-ed the critical surface in by size and bias (blue) and remaining surface using surface deviation. However, after performing surface deviation (pink), I'm not getting proper visualization of mesh. How do I resolve?
  20. Good Afternoon, I've seen "Material Orientation Method" topic from @Ameydholam, however mine is slightly different that's why i created this new topic. So, my main goal is to evaluate the "influence/effect" of the printing direction considering an orthotropic material (MAT9ORT). My problem arises at the very start, considering that i used CHEXA or CPENTA I can never change material direction in accordance to the perpendicular shell element. I created a small example where this is visible, on the first image it's represented the 2D Mesh (Orange and Red) and the 3D Mesh (Blue and White), on the second image it's the material orientation and it's visible that the component that has no 2D shell on that direction is not able to change to the desired direction. Shell elements only have in-plane orientations, that part is clear, however when the solid part is created shouldn´t i be able to give any desired orientation to the solid element? Attached to this follows the model. Hope that anyone can help me. Thanks. material_direction_test.fem
  21. Hello, I am trying to do a linear buckling analysis on a telescopic mast of 12m. The assembly has a blend of 1D, 2D & 3D elements followed by contacts. Anyways i have taken care of all the parameters like element quality, free edges, T connections etc. As usual, I carried out a FREE-FREE Analysis first followed by MODAL & then a STATIC Analysis (Gravity Loading). All the rigid body modes have been eliminated and my modal frequency are as follows 0.676, 0.677, 6.75, 6.78, 19.53, 19.70, 39.55, 39.71, 45.30, 59.39. I don't know why the modal frequency fetched such initial low values and how to interpret the intermediate frequencies occurring in pairs? The Static Analysis results are also satisfactory with a max displacement of 0.235 mm (Mag) and stress of 11.34 MPa.The stress flow pattern is also satisfactory. Now when I simulate a linear buckling analysis I get this error: ERROR 165- Gram-Schmidt reorthogonalization did not converge. This is caused by ill-conditioning of the shifted matrix in Lanczos run. I have gone through a few other posts in this forum which said to remove rigid body modes, but i don't have any rigid body modes as such. And it is quite evident from the static analysis that my model is well connected and contacts are acting. Could you please let me know how to resolve this issue? Thank you.
  22. I'am studying how a components performance is affected by the materials isotropic and orthotropic behaviour. The image attached shows the same 3d solid mesh using hexa and penta elements but with an isotropic material (top) and an orthotropic material (bottom). I'am using mat1 for isotropic and mat9ort for orthotropic. There is a clear difference in stress for the cpenta elements compared to the chexa. Are cpenta elements fully supported for mat9ort or is this behaviour a result of the cpenta element formulation?
  23. Andy@LamteqSolutions

    Optistruct - large contact forces

    Hi All, I seem to have a recurring issue and it doesn't seem to make much difference if I use S2S or N2S. I have a number of very similar models, all set up the same way and I would only expect a mild difference in stress distribution and contact. What I get is with some of the loadcases I have an extremely high contact force. Now I've encountered this before and have needed to switch to gaps but this time I really do need the contact forces exported. Here are some notes..... NLPARA = NINC 10 PARAM = CNTSTB Contact card = Adjust = auto, type = slide, MORIENT = Norm. In general, slave contact surface is smaller mesh size. I've added some images....
  24. I am trying to run an example, provided by altair on their help page, about vibroacoustic interaction and wave propagation using infinite elements CACINF3. The link to the page is: https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/acoustic_analysis_of_speaker_os_example_r.htm#results However, I am unable to run the problem using optistruct 2017. The error message given is: The model file follows attached. Speaker_IE-C.fem
  25. Hi, Need clarification regarding FRF Analysis in Optistruct. What is the difference by applying excitation in two different cases? For example we need to apply 1g excitation. How to apply in below cases? Case 1 - Using RBE2/RBE3 Case 2 - Separate Regards, Arul