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Found 624 results

  1. 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.
  2. Hello, In Ansys and Abaqus solvers I Used to apply a "Skin" (2D elements based on the outer surface of 3D elements) on castings in order to read superficial stresses in Hyperview. These elements were membrane elements and were declared different than regular shell elements. For Optistruct which type of element is the one suited as membrane element? Is there any other approach to read superficial stress on castings? Here is an image of the availabre trias type of elements, which one should I Use? Thank you for your time!
  3. 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
  4. 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?
  5. 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!
  6. Hi , I am working on modal analysis of rotor system in optistruct. I have queries regarding constraints. Pls find the following image which shows rotor assembly with bearing. I need to allow rotation free of rotor and shaft at bearing locations. How to give constraints at bearing locations ? Using RBE2 or any other options are there in Optistruct? Thanks Arul
  7. 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
  8. Hi, I want to know the meaning of the data in output file for nonlinear transient analysis. What is the meaning of ' itstp', 'norm(da)', 'noram(u_ref)', 'err_da', 'adjustment'? 'err_da' is error for what? 'itstp' is iteration step? then what is the difference between 'itstp' and 'Iter' ? 'Cutback' means that iteration does not satisfy the convergence criteria? So increment load is changed? In this, what is the meaning of 'Reduce next'?? what should be reduced next? In this, what is the meaning of 'No change' ?? What should be not changed? In this, what is the meaning of 'Enlarge next' ?? What should be enlarged? Thanks
  9. Hi everyone, I modeled an element in Altair Inspire, then I imported it in HyperWorks as a Solver deck. The mesh is created by Inspire, is there a procedure to refine the mesh o remesh the object? I tried to remesh some volumes, but the longest side of the FEs was not divided. Bests Martina
  10. Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
  11. Hello, I am trying to assign a failure criteria based on strain. For example, I want to be able to remove or replace the material properties of elements that reach 0.9% strain, or do the same thing when the principal strain of an element exceeds 10000 microstrain (these figures are from literature). The MATF card only takes stresses. How can I implement these strain-based criteria? Thanks.
  12. 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
  13. What is the difference between them in term of slave and master nordes relative movement?
  14. Hi, My load step is nonlinear transient and my model contained the contact. Output message is as follows. My model does not have a linear analysis SUBCASE. "the gap/contact behavior depends on the initial open/closed status and does not change." -> It means contact status is not updated. But the status is updated for each iteration in my results. Why does the message appear? is it just only information? Thanks.
  15. Hi everyone, I am modeling a system composed by solid elements that are welded together. I want to develop tetra mesh from 2D automesh at the contact surfaces, but when I create the 2D mesh on the adjacent surfaces they are different and this leads me to an incorrect 3D mesh because after tetra meshing I equivanlence the nodes on the adjacent surfaces and the mesh elements fail. I use "keep connectivity" when I create the 2D mesh, but sometimes the meshes are equal, sometimes they are quite different. Why? What can I do?
  16. Hello, I would like to understand what the solver is doing wile trying to solve a nonlinear problem. I understand I have stated in NLPARAM to star iteration at 1.0E-2. I have also activated ExpertNL In the next picture, what is the solver doing each iteration of each load step? what is changing? what Average U, Err. EPI, Measures EWI mean? WHat is the goal of the solver to notice it is reaching convergence?
  17. Hi, How to Clear the temporary nodes? Find the following Image. It is not cleared even it I use the option ( Shift +F2) and it is showing in Post processing. Is there any other way to clear?
  18. Does anyone know how to make the stress change with each displacement step in an optistruct simulation? Currently when I have it show me the stress heat map, it doesn't change at each displacement step.
  19. I am having trouble figuring out why there are strange reaction forces in my model. The rightmost node allows for rotation (vector out/in screen) and the bottom left node pushes up at a set displacement. The rightmost node should not have so much force in the x-direction. Any help in figuring out why this is happening is much appreciated. Femur_Model_7_1.hm
  20. Hello, I have a group of springs from which I want to extract the total force in a simulation. Is there a quick and easy way to do this? I'd really appreciate your help
  21. I am trying to squeeze a femur model with two sets of stiff springs top and bottom, and allow it to rotate with the other (spring BCs come from a research paper). Instead, the model bends where the mesh meets the springs that should remain mostly straight. However, I have tried adjusting all DOF stiffnesses in the PBUSH card without luck. All springs have been assigned to the local coordinate system (shown in right on photos) using CBUSH card. It seems to me I need to stiffen K2 or K6 (y-tension, z-moment), but neither of these solves the issue. Attached graphs show "TY" stresses. Femur_Model_6_26.fem
  22. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!
  23. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!
  24. Hello all, I am trying to load a femur model according to a local coordinate system. When loading in the non-desired direction for testing (Z-dir) the model node moves predictably. But when I try to load in the desired direction against the springs (X-dir), the model does some crazy twisting and weird movement. Would love some help resolving this issue. I have a suspicion it may have to do with the springs... making them very compliant still didn't solve my issue though. .fem files attached 6_25_Altair_Question.zip
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