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Found 626 results

  1. hi everyone, I have run my model but the software do not create .h3d file best regards hi moderators, r13.fem
  2. jang

    error 312

    I got an error when I run optimization. ************************************************************************ A fatal error has occurred during computations: *** ERROR # 312 *** In static load case 1 the compliance is negative or large -5.62632e+013. Optimization/buckling analysis cannot be performed. due to possible rigid body mode. INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED). *** SOME ERRORS WERE REPORTED DURING THE RUN, *** PLEASE VERIFY RESULTS AS THEY MAY BE INVALID. ... ************************************************************************ But it didn't have rigids. 1.hm
  3. Hi, I am trying to solve a non-linear buckling analysis using Altair Hyperworks with Optistruct as a solver. I am unable to find the load step for it. Both non-linear static and linear buckling work. linear buckling won't accept NL static as input or as a STATSUB Preload. Is this option for non-linear buckling even available in this solver? or do I have to use any other solver. please advise. If there is any example available for this kind of analysis, that would be a lot of help. I couldn't find anything in the ebook "Non linear FEA using Optistruct".
  4. Hello, I work on a vehicle suspension optimization. For that purpose I need to perform a dynamic buckling analysis of a tube (meshed by 1D beam elements). I have already performed static analysis, static buckling and modal analysis and the next step is performing dynamic buckling with force impulse. In order to perform this analysis I need to apply an imperfection of the geometry (initial deformation). The imperfection is supposed to be the first buckling mode from static buckling and the corresponding displacements are assumed as a coefficient 0.01, 0.05 etc. Therefore my question is whether it is possible to apply such buckling mode imperfection in OptiStruct, if so where I can find this option? Thank you for any help in advance.
  5. 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
  6. 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
  7. Hi everyone, I need to define a surface from a set of lines that represent level curves of a set of mountains. The creation of surfaces from lines does not work well. Is there a way to obtain good surfaces? Bests Martina
  8. Hello, The Topology Optimization in Optistruct by default uses the Direct method for the Sensitivity analysis. I am predicting the result variation using the Adjoint method. It would be of great help to me if I know the way that I can make the solver use the Adjoint method of Sensitivity anslysis. Any help is appreciated! Thanks!
  9. Hi guys, I would like to know if its possible to update my hyperworks 2017.2 to 2017.2.1 in order to inlude certain features especially overhang constraints in my simulation. Thank you.
  10. Hello! I want to measure the volume of a solid. I know I can find this in Tool --> Mass Calc I am interested in measuring the volume with more numerical precicion. Is there a way of increasing this? For example i would like to read more numbers beyond 2.781 as the image shows. Thank you
  11. Hi everyone, is it possible to define as input data the behaviour curve of a non linear elasto-plastic matierial in a MAT1 card image material with the NL parameters activated? I tried to import the curve, changing the TYPSTRN value, but the solver Optistruct does not start. The curve has non linear trend both in the elastic that in the plastic phase. Bests Martina
  12. How can we prove Topology Optimization method by Analytically/ Mathematical modelling. If not complex any Simple structures to show results matching with CAE techniques. ?
  13. Good afternoon, I'm trying to mesh a housing and I wanna model parts of it with SHELLS and others with SOLIDS. How do I connect both? Thanks!
  14. 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
  15. Hi everyone, I am simulating tensile tests with welded samples. I am using NLQS analysis in Optistruct, according to the eBook Introduction to Non Linear Finite Element Analysis using Optistruct. My problem is that the stress-displacement curve after the simulation shows stresses which value is higher than the ultimate stress imposed with the TABLES1. How is it possible? Why the stress-displacement curve does not become flat? Does it have any meaning? Bests Martina
  16. 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
  17. Hello all, I am currently working on NVH Frequency response analysis with optistruct and nastran solvers and I see an error of opproximately 10%. Same FEA model has been used in both solvers and the error is 10%. If both the models are created in their corresponding solvers, then the error comes out to be 7%. How good is Optistruct solver for NVH to match Nasran solver? Any benchmarking done on this? Please help me out. Thanks and regards, Punith
  18. Hello, I would like to export the residual stress results from a forming simulation in Hyperform to carry out a structural analysis of the formed part in OptiStruct. Could some one please share a tutorial based on this workflow? Thank you in advance. Regards,
  19. I have worked before with Pretension analysis and pretension manager on Optistruct. I am obtaining this error at the moment *** ERROR # 3090 *** Normals on the cutting section of PRETENS #20 are not consistent. Do you kow what this means? Thank you!
  20. Hi everyone, I created an external unit cell, meshed it in Hypermesh and defined everything according to the Multiscale Designer Manual - Periodic mesh on opposing faces of unit cell - 3D mesh with only CTETRA elements - One component for each micro-phase (with component ID 1 & 2) - One property (PSOLID) for each micro-phase (with property ID 1 & 2) When I try to import my .fem-file in MSD I get the erroro message depicted below. I tried to import the external unit cell from the examples folder of Multiscale Designer and that worked. So the setup of my MSD works in principal but cannot import my file. Does anyone know how to resolve this? Thanks for your support.
  21. Hello all, I'have a problem with a file .fem. I try to start the calculation with optistruct, but few minutes later an error appears and the calculation stop. The error is error#1260 "Missing subcase information in the input file". I have checked if the nodes where the force are applied are connected, and the nodes are ok. Can you help me?
  22. 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
  23. 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!
  24. Hi there. I hope someone will help me finish my model. I am analyzing a beam that will move the entire wind tunnel support jacket. See first picture. This beam is placed on top of the SPMT truck. See second picture. My question is: A. How to I model the contact between the top of the long beam and bottom of the bracket (second picture denoted as A). I am getting an error "Undefined SET SSID on CONTACT 1" but I already defined it. I don't know what am I missing. B. The boundary condition will be placed at the wood locations. This will be in compression only condition. How do I model that? I am attaching my model (only half have been modeled yet). JDN_Loading_Beam_Rev_A.hm
  25. 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
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