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Found 458 results

  1. hello, I am working on model of pressure plate which have axis offset. A shaft passes through it. when pressure applied (in x-y) on the pressure plate due to the offset one side of pressure plate will have more pressure. Which causes rotation on around z axis. As the shaft passes through z-axis. Shaft and pressure plate are in contact.. As pressure plate will rotate it will tend to rotate the shaft. I want to find out for particular pressure how munch is torque is generated. i want to get torque as output when pressure is applied. how to get torque as direct output
  2. Mrt

    edge_to_surface contact

    Hello all! who have had problem like me and have solved it? i'm trying to do edge_to_surface contact in optistruct. i can't add model. if i have large model with ribs panel will impact to them. could you give me any tricks to win it? thanks a lot.
  3. Sid98

    Topology Optimization

    Please tell me how to minimize mass with responses mass and stress (no constraints and bounds are given, only max. von mises stress is known). Thanks in advance.
  4. Moghees Shahid

    Hypermesh Interface Setup for Optistruct

    Hi all, I am a beginner here. I am trying to create a contact between a tank and its support (an interface). What should I look out for? What parameters will tell me its a good connection or I have made an error. and what kind of checks can I perform before the actual analysis? As of right now, after the interface, when I apply a force on the tank, the contours do not show up on the support even if a increase the load considerably which tells me somoething is not right with the connection between the two parts. I import the tank and support in the same file but as different parts and I then I use solidmap mesh on the two parts separately and equivalence the nodes. Any help would be highly appreciated. Thanks
  5. Hi all, Expanded Polystyrene (EPS) is usually used as a package material. A quasi-static compression test was done to test its material behavior. In order to validate the material stress-strain curve from the compression test, a simulation should be done. The velocity of the compression test was about 5mm/min, so I think a static nonlinear analysis in optistruct may be proper. However, I don't know which material model is suitable for EPS foam material which has both hyperelastic and plastic behavior. Any suggestions? Roy
  6. Hello, on your opinion, what kind of material formulation could be the best for the material described by the attached graph? Considering we want to apply on the structure a static load case and the material is a Thermoplastic Polymer. I'm using Optistruct solver thank you
  7. Hello Guys, I want to reanalyse my results from a topology optimization. As the part has thick walls, I don`t want to calculate with a surface-mesh. Is it possible to do a reanalysis with solid-mesh? (If yes - how?) Thank you Cheers
  8. Hi everyone, Could you help me understand the phenomema that I describe below ? I conducted a non-linear analysis with activating LGDISP. After comparing the results with and without LGDISP, I found that there is a big difference in displacement. If I don't activate LGDISP, the displacement of model is very large. Otherwises, the displacement becomes small with LGDISP. I don't understand this phenomena. Note : In my model, I have plastic material so with small young's modulus , but just linear comportement is taken into account (I don't have informations on parameters for determining its non-linear comportement). I implemented non-linear analysis because of contact phenomena. Thanks for your helps.
  9. Hi everybody, I was running a test with optistruct using two simple cubes. They are both fixed at opposite ends. Their faces are separated by 0.1 mm and can, if pushed, become engaged in a contact (type SLIDE). Type of analysis: nonlinear quasistatic. Issue: Even if I fixed both cubes at their bases and there is no applied force and no contact is engaged (shcdist=0.001 and the solver warns me that no contact elements have been defined during the analysis), the cubes translate of 2 mm as if they are moving like rigid bodies. I have already tried to constrain some more nodes, to no avail. Any explanation for this thing by anyone? Thank you in advance. Find attached my .fem file to check SHRCTOL001.fem
  10. Is it possible to create contact between two surfaces edges in Optistruct? does it require a special interface type? I tried creating a contact interface with an element set for master and a node set for slave, but it doesn't work. The solver outputs this error: *** ERROR # 1762 *** Incorrect SET type for MSID This video explains how to do what I'm trying to do in the Ansys profile. I would like to know how to do it in Bulk data format. https://www.youtube.com/watch?v=Bx6JFiqeCmM Thanks in advance!
  11. Hey Guys, I want to do a topology optimization. To create the optimization constraint <tilting < upper bound>, I have to have a optimization response with the angle of a specific component face. Do you have an idea how I could do it? Thank you in advance Cheers
  12. The Optistruct manual says that when defining a CBUSH element with coincident GA and GB one must specify a CID. (Optistruct manual, CBUSH page, Comment 5) I do not see a way of specifying a CID in HM. Editing the element has the fields for X1, X2, X3, but the there is no field 9 for the CID. How can assigning a CID to a CBUSH be done? Thank you. Phil
  13. Thiago Marinho

    Problems with Fatigue Analysis

    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!
  14. Hello everyone, I've performed a non-linear quasi-static with seven components. I applied a moment in the middle component that transfer the load to the others gears. The behavior of others component are according to the expectations. But when I assign 20% of scale in deformation (in order to see the animation) the middle component has a strange behavior. Someone knows why does it happen? Follow the pictures before and after assigned the scale. Thanks in advance. Henry
  15. Greetings Forum Members, I am writing to understand the various result options (especially in stresses and strains) available in Optistruct (or any solver) Post-processing. Usually everyone follows the industry thumb rule of looking at VonMises stresses, Displacement (Mag) and Plastic Strain or equivalent plastic strain. But there are a lot of other result options available but many never seem to use it. I have attached screen shots of the some of the various result options (Stresses and Strains) available below:- Could anyone Kindly go through the above results options and explain the differences between them also establish a understanding of when to use them. For example, 1) what is the difference between VonMises, VonMises (Z1), VonMises (Z2), VonMises (mid). What does the Z1, Z2 and Mid imply? 2) what is the difference between P1 Major Z1, P1 Major Z2, P1 Major Mid and P1 Minor ? Even a simple answer in simplistic terms would suffice. Also kindly share any reference material available in understanding the results? What to look for after the analysis has been completed? Thank you. Best Regards, Bharat Pinapati
  16. Sp108

    Bearing Analysis

    Hey! I am trying to perform a structural and transient analysis on a Roller Element Bearing model. I am able to perform simple static analysis but I would like to utilize Hyperworks to simulate the following conditions: Inner race to be rotating with a constant velocity and a fixed radial load is applied. Outer race is fixed. The balls should also be rotating. I wish to know: 1. How I can give a constant velocity to the inner race of the bearing while also allowing the balls to rotate? Which card am I supposed to use? 2. What kind of contact constraint should I apply. Right now I am working with slide contact only. 3. Is quasi static analysis adviced or implicit non linear? There is one video but in a different solver which does what I have been trying to do. I wish to do it in Hyperworks. Here is the link: Also please suggest whether optistruct's non linear can be used or whether I should switch over to a different solver module! Cheers
  17. Hello everyone!I'm performing a finite element analysis with a pair of gears and another component around this pair of gears. This system is named as "planetary gears". My model is simplified, just to see how will be the behavior of the system, I'm using the software Hypermesh with the solver OptiStruct. My question is, which degrees of freedom on "FACE 1" and "FACE 2" should I constraint to rotate "GEAR A" and "GEAR B" around the axis X.Degres of freedom:Displacement: x, y and zRotation: x, y and zI have attached the picture. Thanks so much in advance.Henry
  18. 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.
  19. Hi, I'm trying to run a fatigue analysis using acceleration as load, but I don't know how to set the FATLOAD card with an acceleration load. My objective is to simulate a shacker test and verify the life and damage that the part will get when vibrates in 1G acceleration. Modal and frequency response analysis are ok, my only problem is with the fatigue analysis. If anyone knows how to proceed, please let me know. Thanks!
  20. Hi, I have tried the Coupled Linear Heat Transfer/Structure Analysis tutorial. I got exact values for flux and temperature results from subcase1. But the results for static subcase2 where I have referenced the temp (load from case 1) does not match with the tutorial results. File attached for reference, Please help me solving the issue pipe.fem pipe.out pipe.h3d
  21. Hi all, I want to compare the result of shell and solid element for a thin plate bending analysis. So I select a thin plate with dimension 100*100*2mm, the four edge of the plate are all clamped, and a uniform pressure is applied on the top surface. However, I got a different result from OptiStruct and Ansys with the same solid model. Both the material and the mesh are the same. The in-plane element size is 1.25*1.25mm, and there are two elements through its thickness. The maximum stress in X direction from OptiStruct and Ansys is 74.4MPa and 158.7MPa. It's so different. What's more, according to the theory, the maximum stress may be 154MPa, which makes me suspect the optistruct result. The maximum stress theory for four clamped thin plate under uniform pressure loading is given in following link http://www.roymech.co.uk/Useful_Tables/Mechanics/Plates.html What's the reason for this strange result? I have attached my HM file. In addition, is there any document which explain the different options meaning of stress result type and average method? See figure below Thank you Roy Shell_Solid.zip ShellSolidCompare.hm ShellSolidCompare.fem
  22. Hi there, I've run a simulation of the chassis of a car through Optistruct in Hyperview, and there were no errors and everything seemed to run well. However, upon loading into Hyperview, I am unable to view the contour plots for stress/strain/displacement and the four subcases. I am expecting to get a model like Image 1, however am getting image 2. It is as if there are no loads applied to the chassis. If anyone is able to view the model (file attached) and perhaps indicate where I am going wrong it would be greatly appreciated. Cheers Chassis_scaled_newI.hm
  23. Dear all: I have a model with plenty of elements (4,383,225) in OptiStruct for modal analysis. And I got the following error, would you please help on how to solve this problem? Thank you for your help. *** ERROR # 2005 *** WIN_IO: WriteFile failed. (112). **************** Too many error messages. Aborting run. Current limit is 10000. Use "MSGLMT" control card to change this value.
  24. Hello everyone I would like to do a thermo-mechanical optimization. The thermo-mechanical analysis is already done successfully. Now I was looking for a documentation or tutorial about this sort of topology optimization, but I could not find anything. Does anybody of you have a link or documentation to share, about thermo-mechanical topology optimizations? I thank you very much in advance!
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