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Found 675 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. hello, i want to define a anistripic material in optistruct and i don't know what card image should be used for such a material. thanks
  5. hello everyone, i want to do an optimization in order to increase the correlation between experimantal results and numerical ones, using MAC cretria, my design variables are the stifness of the damping springs. my size optimization is well set it works but i don't know how can i connect the expermental result that i have in an .UNV file and the numerical results. to say to optistruct i want to increase the mac between the two. i know that i have to use the parameter TRAKMETH MODETRACK MFILTER. but i don't know the right steps to operate this one. if you have some ideas i will be greatful thanks.
  6. 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.
  7. Hi. I am analyzing cylindrical pressure vessel with fillet at the inner bottom corner. (Pls see attached picture) During the analysis using Optistruct, it stopped and the error message said that "Element # 2575, element type PENTA" the element was at the tip of the fillet. I know removing the fillet is the one of the best way to gain the quality of elements, but I want to analyze the exact model with fillet. Please tell me how to solve this problem. In above picture, brown is solid element and blue is shell element extracted from the face of the solid element in order to add a inner pressure. I am using HyperWorks ver.13. Thank you.
  8. Hi, I want to simulate the elastic (and further the elasto-plastic) behaviour of arbitrary lattice structures with hyperworks by the use of unit cells. Is there a possibility to apply periodic boundary conditions to simulate unit cells? In addition to that i've tried the Multi-Scale Designer for a simulation like this but there is a major limitation. Within MDS i've to specify matrix and the fiber material but i'm only interested in the behaviour of the fiber material without any influence of the matrix material. I hope someone have a solution regarding this topic ;-) best regards
  9. Hi, I'm modeling two fastened components in Hypermesh and I'm looking for a way to simulate pretensioned bolts. I've seen there are bolts elements in Hypermesh but i can't understand how to apply a preload. Appreciate your help and suggestions. Thank you in advance.
  10. Hallo, i want to convert an abaqus modell to an optistruct modell via the hypermesh convert makro. With most of the entities it works fine, but with some not. For example the section properties especially the beam section, connector section and solid section cards are not supported in conversion. The abaqus modell was build up in ansa and now I want to do a topology optimization in hypermesh optistruct. How can I handle this problem? Are there any configuration files for those or any other not supported cards and where can I find them? Thank you in advance. MT
  11. Essa linha clara são 4 elementos de viga que recebem uma força na vertical no centro deles, representam uma manga de eixo. O objetivo é analisar distribuição de tensão nas bandejas de suspensão, por isso é bem simplificado. O problema é que, com uso de RBE3, eles deformam dessa maneira aleatória. Agradeço desde já as respostas.
  12. Dear All, I am trying to do the tutorial of the rubber spring but when I am setting the analysis load step, I can't find the Analysis type Geom non linear (implicit) Is there something missing in my version of HW?
  13. I have a part like following the back plate is constrained and pressure is applied to a round surface on top. I have done linear static analysis. and found the deflection, as follow mac displacement= 2.7 mm I have doubled the thickness pressure and constraints are the same as previous one bu the maximum deflection has increased while I expected to have decrease in maximum deflection since I have doubled the thickness and I have more stiffness Max displacement = 3.2 mm I was wondering what can be the reason ? What should be the trend of maximum displacement?? by increasing the thickness should I expect increase in maximum deflection or decrease??
  14. 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.
  15. Any Idea, how one can perform fatigue analysis of structural ceramic materials? Thanks.
  16. 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
  17. Hey there, since a while my Panel is cut off at the side (see screenshot - on the bottom right). Restarting the Programm / PC didn't help. Deactivating Panels in "View" and reactivating neither. Does someone know this problem and could help me with it? Thank's in advance! Cheers
  18. Hello, I would like to tetra mesh my component from a 2D mesh of trias that already exists. The 2D mesh must remain constant as it has a load applied to it that cannot be changed. The problem I am having is that the tetra mesh option 'fixed trias to tetra mesh' produces large size elements in the middle of the model. I would like to constrain the maximum size of the 3D tetra mesh so its does not increase in size in this way. Is this possible? Thank you in advance
  19. Hello, I am running a topology optimisation using Optistruct. I am trying to look at the key structural members of an aerospace component. I am attempting to use a low volume fraction of ~3-6%. When the volume fraction is particularly low does this effect the solver's ability to converge? Thank you in advance
  20. Hello, I was once told by a colleague before running an optimisation with optistruct to use the control parameters '-ncpu 8 -core IN'. This was to make the simulation run faster. To my understanding '-ncpu 8' ensures the simulation utilises the computers 8 cores. However, I do not know what the '-core IN' does. Can anyone offer any insight into the meaning behind this and if it actually helps with the simulation speed. Additionally, if there are any other optistruct option inputs that could be used to speed up the simulation then please let me know what they are. Thank you in advance.
  21. Hi everyone, i tried to implement shock absorber in a shock analysis in optistruct. I use tutorial in order to set non linear tranisient analysis. I implement with table1d and pbusht the curve ForceVSdisplacement and applying a force i have checked if the the curves is right. Then i have to checked if my model with this non linear springs has a right answer to established input. In this case the model is loaded with an initial displacement and a gravity. Finally i hate to load model with a curves VelocityVSTime. Now i'm stopped at check problem. My doubt are: the initial dislacement is inserted with IC and TIC in model but in the result there isn't initial dipslacement. Why? The tstep is calculated by solver? Is possible have a fixed timestep? maybe more simple simulate this problem with a explicit solver as Radioss? Thank you for the answeres
  22. We are trying to analyze composite PIPE. When creating a cylinder surface and simply creating Piles and Laminates, it is stacked with the surface as an intermediate plane as shown in the attached image. (Cylindrical surface is white line) For example, are there methods such as stacking layers from the outermost layer toward the inside? (I do not want to change the diameter of the cylinder)
  23. Please explain me everything about Synthetic Responses. Thanks in advance
  24. Hi Vijay I have been given the following Project and they have put a tight dead line on this. So I really appreciate if you reply me as soon as you can. This is a fan shroud. When this fan shroud is installed on the engine and starts to vibrate, one of the following happens 1. Those purple pieces which are made of steel start to craking 2. The soft shot (green piece) become separated from the hard shot ( yellow piece) The customer is going to give us two more version of revised design of this to see if they work better than their current model Here is the material stress strain curve and its data point for the the yellow piece, the purple pieces are made of stain less steel and we don't have the material data for the green piece (the soft shot) yet. The inner surface of all those steel pieces and a surface all around the soft shot are constrained in all DOF. The customer has provide us the attached Excel file which shows the frequency range and acceleration at each point (please see the attached file) I appreciate if you guide me about type of analysis for this project. What should I consider in the current model to be compared with revised design to say if the revised ones are better or worse? I have sent you the model via your drop box link too. Copy of L5P_Fan_shroud_accelerations.xlsx
  25. Hello, I have a problem with a linear static analysis with Optistruct; I have to evaluate shear tension on a rotating cylinder with angular acceleration. I've completed the tutorial on the rotating disc; I've also add angular acceleration in RACC field of RFORCE and results are in accordance with analytical formulas. My problem consist in the evaluation of stress in a rotating cylinder (without the central hole) with angular acceleration. I have no problem if RACC =0 and non-zero angular velocity; however, when I add angular acceleration, resultant displacements are very high and stress very low. Did I commit any errors in constraints definition? I constrained DOF 1 2 3 of nodes belonging to the axis of the cylinder. Thank you so much for your attention rotating.fem
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