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Found 630 results

  1. Hello, What is the difference between CORD2R and CORD3R? What are their properties? If I reference joints to a specific coordinate system what would the difference be with CORD2R and CORD3R? Thank you!
  2. Hi all, I got Windows 10 and the Hyperworks Student Edition 2017. I can start the Hyperworks student edition and create everything up to a model which is ready for the analysis with Optistruct. The problem is, when I try to start the analysis with Optistruct nothing is happening (at the down-left corner something running but it stops on "Ready"). I also read the other topic but that solution doesn't work for me either. I already tried to uninstall and install the program several times to different directories but nothing helps. I am trying to fix this problem for a week now and I'm starting to get desperate. I really need this program to work for a university project and I hope someone can help me. Thanks in advance Spaessel
  3. Hello, I am using an axial joint and want to to add motion to it. My questions are: 1) Which node moves relative to who? a. Node1 Moves and Node 2 Does not move b. Node 1 does not move and node move 2) If i was to assign a DOF = 1 in MOTNJG does this mean that the node moving wil move in the axial direction of my joint? Thank you!
  4. Hi, I want to run a topography optimization of a sheet metal component, but I would like to restrict the shape change with barrier mesh inside and outside due to the adjacent components. How can I do this?. Can someone help me with this concern?. I know that barrier mesh option is available in free shape optimization but I really want to make use of only Topography optimization as it is a sheet metal component. Thanks and regards, Punith
  5. Hi, My loadstep, TSTEP and NLPARM are as follows In the result, the number of the time data is 432. (Its time step is not 0.0001) I learned that when NLPARM and TSTEP are used together, DT on NLPARM overrides DT on TSTEP. This result is caused by incremental load based approach in OptiStruct? Thanks
  6. Hı everyone, I want to do compressive analysis with optistruct. My compenent is Sheell so I used to PSHELL card. But the program want from me T parameter. I know T is Thickness and shoul be greater than one. but I dont know is it component thickness or other somethink. How do I adjust it. Thank you. .
  7. 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!
  8. hi everyone, I have run my model but the software do not create .h3d file best regards hi moderators, r13.fem
  9. 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
  10. 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".
  11. 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.
  12. Hi, I'm running a NLSTAT (quasi static simulation) analysis with geometric and material nonlinearities with large displacements. I need Reaction forces of all incremenets in a specific spc node to get the FORCE/TIME STEP graph. I read before that this output of GPFORCE or SPCFORCE is not supported in older versions. What about the latest one? Is there something I have missed? Also what is your suggestion on alternative, if that output is not supported? Dynamic implicit simulation? Thanks for your answer!
  13. 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
  14. Hello,Forums I am doing analysis of a unique CFRP pipe by Optistruct. I am receiving this following error message: *** ERROR # 605 *** Element 1 is referenced by STACK 1 (on PLY 1) and by STACK 2 (on PLY 5) simultaneously. Different stacks are created by dividing the upper and lower areas of the pipe into sets. There seems to be an error because it refers to the same element Is there any good way to do it? (Modeling is possible but analysis is error) CFRP-PIPE-Asymmetric laminated.hm
  15. 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
  16. 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
  17. 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
  18. Hey guys, I’m a mechanical engineer student and I participate in a project where I analysis the structure of a modern tricycle. I need help with the fatigue analysis. I make the training of fatigue by Altair and tried make the analysis, but I’m not sure of the results. I think the problem it’s on the TABFAT. About the TABFAT: My analysis has 1D and 2D elements. I obtained the following values in the Linear Static Analysis: Analysis 1D Analysis 2D σ_max 24,59 MPa 267,9 Mpa σ_min -19,71 MPa 0 MPa Can I represent the load cycle of my “vehicle” like a sinusoidal curve? Can you show me how I represent it? Should I represent these values for each of the fatigue analysis like one analysis for 1D elements and other analysis for 2D elements? Can I “mix” these values for the two analyses representing σ_max = 24,59 MPa and σ_min = -19,71 MPa? I think that a correct method is consider my load cycle like a variable load, but I don’t obtain experimental data. About the MATFAT: I acquired the MATFAT data by the eFatigue website, but I don’t obtain the SE (standard error of log(N)). How I find out this? If I consider SE like “Default” (zero), how will affect my analysis? Note: I’m making a SN analysis. Thanks for helping!
  19. 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
  20. 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.
  21. How can we prove Topology Optimization method by Analytically/ Mathematical modelling. If not complex any Simple structures to show results matching with CAE techniques. ?
  22. 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!
  23. 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
  24. 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
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