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Found 669 results

  1. 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.
  2. Hi, I am doing a heat transfer analysis (transient) with OptiStruct and I want to apply a distribution of temperatures to a solid face. I usually use TLOAD1 cards as DLOAD in the loadstep, and SPCD in the EXCITEID field of the TLOAD card. I know how to apply SPCD constraints when the temperature is the same for all nodes of the face, but I have a .txt file with different temperature values of each node and I don't know how to proceed. What is the procedure to solve this problem? Thanks in advance!
  3. Hello everyone, i am doing linear static + modal analysis to be to AcuSolve for fsi simulation. Optistruct simulation details: riser pinned at two end (constrain at xyz translation, free xyx rotation) + upward force (top tension) define as load. The loadsteps in optistruct are: 1. Linear static: spc: defined load: defined 2. modal Analysis: spc: defined method (struct): defined statsub (preload): linear static I get an error during importing op2 file into acuconsole-eigenmode manager; "internal error: inconsistent number of eigenvalue. The error only occur when there are two subcase (linear static + modal analysis). If i only do modal analysis without linear static, i can import the op2 file without any error. Is there any way(s) i can exclude linear analysis in "output: op2 card"? Attached is the thread in AcuSolve forum with sim files. Thanks in advance!
  4. Hi everyone, I'm having trouble with a size optimization of a component I designed. The objective is to minimize the mass of the part while constraining the deformation at a single node to max 2 mm (+ and -). The result of the free-size optimization gave me a deformation of 1.6 mm and the size optimization always fails with an infeasible design. The program seems to delete all of the plies leaving it with only two, which are predefined by a constant constraint in the free-size design variable. I tested it with the ply sets altered for manufacturing and also tried it with the base sets, which I got from the free-size optimization. Neither works. Both fail after the 3rd iteration with the 2nd and 3rd one being seemingly the same. I have attached one of the .out-files. minmass_base_model.out
  5. I set up a 2D topology optimization and mostly for faster computation I'd like Optistruct to only vary between the full thickness and 0 for each element. How can I implement that? And how do I get a usable CAD file out of the 2D result?
  6. I'd like to create a displacement response (also an optimisation constraint), which is measured at a point outside of my geometry. I tried to fix him to my geometry with an RBE2 element, but that made the RBE2 stretch and the point stayed where it was. I'd like the point to move by the same amount a / some nodes of my component move after applying a force. How can I achieve that?
  7. Guest

    Responses

    I am Ing. Andrés Palacios, please, if you can, help me with information about "Responses" of Hypermesh responses, what they are and how are used in the optimization tab, such as mass, volume, static force, beadfrac and the other, for a thesis of master. thank you very much
  8. Hello, My name is Benjamin, and I am currently using Optistruct for my masters thesis in the aviation sector. My work will incorporate a topology optimization with two materials, for which I am now trying to learn as much as possible about the software. This led me to the help section of Optistruct where I found the two tutorials: -OS-E: 0896 Multi-Material Topology Optimization of Automotive Cradle -OS-E: 0897 Multi-Material Topology Optimization of Automotive Chassis Unfortunately, as I understand it so far, the model files are not delivered with the student version of Hypermesh/Optistruct. Could you provide the files for me? If you can think of yay further resources for Multi Material Topology Optimization I would be very thankful! A big question I am asking myself right now would be if there is a possibility to define the interface between the two materials used, e.g. by a stress constrain which should account for an adhesive stress limit. Best regards, Benjamin
  9. Hi I am performing a heat transfer simulation (steady state). The model consists of 2 plates joined together by a glue connector. One plate is heated up, the other one is at the ambient temperature. The problem I have is that when I look at the result, the RBE3 elements seem to act as insulators (see image below), the bottom surface is hooter that the upper surface, the blue region is the glue. I know it is possible to specify a thermal expansion coefficient for these elements but is it possible to specify a thermal conductivity value as well? Looking forward to your replies Toon
  10. Hello everyone, Regarding some Shock's analysis demands, I've decided to facilitate and automate (using Activate) the task to obtain the expected Shock Response Spectrum curve as below: This model will be very useful for those who are intending to do some Shock's analysis, even a linear approximation using the amplification factor on a certain frequency, as a Response Spectrum covering all the frequency domain. Basically the inputs are the Half-sine and System properties: Sine: Magnitude, period, phase. System: Mass, damping, stiffness. After set them, you'll just have to click 'Run' and then 'Execute'. Besides the traditional plots (Acceleration (G) vs. Frequency (Hz)) you will already have the 'TABLED1.fem' to be used on OptiStruct, as can be seen in this video. Thanks for @robertavarela, @RoKet and @Adriano Koga for some tips regarding the modeling. Hope this be very useful for you all! Please, let me know if you have any question about this model (attached). João. Srs_curve_model.zip
  11. Hello, what does this error message means? *** WARNING # 4961 Reference stiffness underlying contact 1 is 9.860277e-11 times the average diagonal stiffness of the global model. I have TIE, SMALL friction and FINITE friction surface-to-surface contacts in my model. For all of them this error message appears after changing geometry and mesh. In the same model with a slight other geometry and before remeshing, these errors didn't appear. All i did was reassign the contact surfaces to the new mesh. Defining the contacts totaly new didn't helped. Tank you very much for your help! With kind regards Tim Winkler
  12. Greetings, I am performing a free-size optimization of an insert. The thickness of the insert is chosen as the design variable. A minimum and maximum value are set during the DV definition as sown below: However, what value of the thickness does Optistruct choose as the initial guess value for the first iteration?
  13. Model Checker is a very useful tool embed in HyperMesh that performs a series of verifications in your model in order to catch most common errors even before submitting the model to run, as it may take some time to export it and then launch it. To Load the ‘Model Checker’: [HWx and HM Desktop] Ctrl+F >> ‘model checker’ [HM Desktop] Tools > Model Checker Once it is open, you can perform a check by right-mouse click (RMB) and click ‘Run’. Model Checker will verify your model considering the most common ERROR and WARNING scenario for your solver.
  14. Hello, What is the difference between JOINTG Reaction forces and Element Stress (1D)? To what i have seen they dont match, when I extract one or another, their magnitudes are not the same? so, what of each of this mean? thank you!
  15. Hello, i am performing a topographie optimization of a hat-shaped beam unter 3-point-bending with HyperMesh and Optistruct. My aime is to minimize the compliance beneath a certain value (objective minimize compliance, constraint compliance < 14000), without exceeding a certain mass (constraint m < 0,000553) In the optimization controls i have limited the maximum number of iterations to 100 and the convergenze criterion to 0,000001. When i start the optimization, optistruct only performs the inital analysis and one optimization-iteration. The compliance of this one and only optimization-iteration is lower then the inital compliance but higher then the desired compliance. Why does optistruct dont perform additional iterations? Thank you very much for your help! With kind regards Tim Winkler
  16. Dear All, I try to do simple heat transfer simulation by following OS-1385. when I run the simulation I got Error 1000 message, I know that the CGAP material does not have material, but in the OS-1385, the CGAP also doesn't have material too. Please your advise. Best regards, Iron_man CASE01.fem
  17. Hello, I'm trying to run a non-linear static analysis with Optistruct 2019. However, I always get this error message: *** INTERNAL PROGRAMMING ERROR *** in file "malloc_1.c", at location # 723. Dyn_array failed allocation for 2.528657e+03 MB Thank you in advance. Julian_OTM_mitBohrung.stat Julian_OTM_mitBohrung.out
  18. Hello, i have a curved shell-geometry on which i like to reorient the nodal coordinate systems to follow the curvature. I only like to do that for the nodes on the edge. With that nodal systems i like to assign rotational boundary condition following the curvature of the shell-geometry. I am using OptiStruct for Solving. How do i proceed to achieve this goal? Thank you very much for your help! With kind regards Tim
  19. Hi! When performing size optimization I am getting this error message. I have read on this forum two possible explanations but both aren't correcting my error. Please let me know what to do. OG rotor UofT model 1.hm
  20. Hello, could anyone help me to create the mass-spring-damper models in optistruct?
  21. Hello, I have few questions regarding spring in optistruct. 1. How can I load a Cbush o cbush 1D? I know how to stablish the spring K but not a load. 2. Can I choose the direction of the load? Thank you!
  22. Greetings, I have a FEM model whose mass calculated by Hypermesh (under Tools > masscalc) is equal to 2.22 kg I am running a free-size optimization of this model. From the design parameters summary reflected in the *.out file (shown below), the sum of design and non-design mass is equal to 2.51524 kg: After the iterations begin, the mass registered in iteration 0 is 2.34766 kg Question: Is it wrong to expect the following: FEM mass = (design + non-design mass) = mass at iteration 0? Why are these values different?
  23. Greetings, I am performing a free-size optimization (iteration summary given below) and trying to understand the explanation behind maximum constraint violation %. So far the following is clear: If constraint violation > 1% : status is V (violated) If constraint violation < 1% : status is A (Active) Large constraint violation % could mean that the constraint is too tight and that the problem itself is ill-defined. the difference between regular and soft convergence is understood as well Problem definition: The thickness of an insert is defined to be the DV. Two stress constraints are defined. The objective is a stress minmax formulation. Question: I am unable to figure out whether the large constraint violation % implies a critical issue. If yes, how does one rectify the problem? Insert_FEM_y.out
  24. Hello, I'm useing Hypermesh for modelling and Optistruct for solving. If I want to solve via the radiobutton: Analysis --> OptiStruct but it just gives me the *.fem file. (Picture below) I can solve via a *.bat file but can't view the results in Hyperview. Only Hyperplay is possible. So I think Hyperview wasn't installed?! But how can I install just hyperview. I installed the edu2017_win64.exe and also got the Altair_lic.dat. I'm using Hyperworks 2017 Student Edition
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