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Jan Grasmannsdorf

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About Jan Grasmannsdorf

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  1. Dear Altair Teams, please find attached the starting document and data for the science hack this weekend. We would like to wish you a good start. Post your questions within this Forum. You might also upload data or models within this Forum. Thomas, Lorenzo, Jan and the Altair Team Altair_Climate_Model_StartHere.pdf ChallengeData.xlsx
  2. Hello, as you are using shell elements, the material orientation x-axis (= E1) is by definition always in the local XY plane of the shells. In your case, you might need to consider a Solid Element model, to have a local E1 orientation in parallel to the z-axis. The material law would then be MAT9 or MAT9ORT. Jan
  3. You could use the "GPAD" Option in your contact parameters, to define a certain thickness of the contact, derived from your beam section. This could be probably done automatically, using a script.
  4. Maybe Morphing with "Map to Geometry" would be a faster approach to your task: https://www.screencast.com/t/xSRuc0nQX
  5. Here is the link to the video, explaining the contact definition: https://www.screencast.com/t/nK1NO4swbn
  6. Hello, attached is a model, that describes the contact definition using the "adjust" option. To define a contact, you have a mesh of 2D Elements and an element set on the outside of your design space and a node set containing your 1D nodes. The adjust Parameter needs to have the distance in which to search for the contact and then pushes all slave (1D) nodes to the shell. In the standard definition, the Shell Thickness is considered but not the 1D Diameter. So to avoid penetrations please set the PSHELL Thickness larger than twice your maximum Beam Cross section. In this video, the beam section is 7.7, so I set the PSHELL to 16 > 2x7.7. The Pushout direction during the adjust is influenced by your Shell Normal direction, so you need to seht the "MORIENT" option in your contact definition. To get the final position, use the "position" measure in HyperView or the corresponding OML or TCL language command in COMPOSE after reading your H3D results. Jan contactProblem1D_Altair.hm contactProblem1D.h3d contactProblem1D_Altair_ManyContacts.hm contactProblem1D_Altair_manyContacts.h3d
  7. There is no visco elastic material in Optistruct. You can implement User materials for this.
  8. Currently I’m working on my thesis and for this I’m using Hypermesh 2017. I have a few questions regarding Hypermesh 2017 and I would be really thankful if you could help me: I’m using a model, with 6 sides, which should be constrained with MPC on 3 sides and also be restrained on the other 3 sides. I actually couldn’t find the exact option for the restraints, so I guessed the best option is to use the “Suport1”. So I wanted to ask you, if you would recommend this “Suport1” for restraining the model or is there another option to restrain? The question here is: what do you want to achieve? To constraing the structure by locking single degrees of freedom to zero displacement, please use the SPC type for constraints. The MPC type is meant to lock a degree of freedom from one node to another node (e.g. Node 1 should move the same amount in x as Node 2) The Suport Constraint is meant only for inertia relief analysis - so for cases in which you constrain a structure by defining an opposing force (e.g a plane wing in the air is held by an opposing inertia force). The Force/Pressure which should be applied to the model increases in proportion. So I wanted to ask you, where do I find the option to solve this Please use the "equation" option in the forces panel to define a force / pressure distribution which is e.g. linearly increasing Which is the best Material Card for ABS (acrylonitrile-butadiene-styrene) in Optistruct? I have the stress-strain-curve and also the values for E, Nu, and Rho? I can't really answer this, as it depends on your material curve (which I do not know). For a general stress strain curve, please use the MATS1 Material model MATHE would be the correct material, if your material has a hyperelastic behaviour Is there a Material Card for Visco-Elasticity Material in Optistruct? Is there an option to define MPCs and Restraints in Radioss Block100? Or is this only possible in Optistruct? You can define constraints also for the RADIOSS Solver by using the RADIOSS User Profile in HyperMesh
  9. Hello, you can export any mesh point coordinates by using the File -> Export -> Solver Deck function in HyperMesh. Please make sure that you choose a user profile (at the start of HyperMesh) and format that is supported by Catia V5. Then you should be able to import the HyperMesh generated data into your CAD system. Jan
  10. Dear Mr./Ms. currently, I am looking for a way to generate points (in 3D) over a random surface. So far I see some very impressive futures in HyperMash. I wonder if there is an opportunity to export the points that are generated with the mesh. Ideally, i would be able to generate a mesh and then export the points to CATIA V5 where I can use them.
  11. Hello, there might be many reasons, why you wont get the same result between two different solvers. For a linear static analysis in HyperWorks, your model looks fine, so I would definitely trust the results that you are getting. The reasons why they differ from Ansys might be: 1) In Ansys, you might have different Element Type (e.g. Tetras instead of Hexa / Brick elements) or a different element order (you use 2nd order elements in HyperWorks) 2) Ansys workbench might change or adapt your input or boundary conditions without notifying you, e.g. at the constraint locations 3) maybe you use a linear static analysis in HyperWorks and have defined something different (large deformation or non-linear analysis) in Ansys? 4) You might have a different location of your stress ( in HyperWorks stress is at the element center by default)?
  12. Hello, there are several ways to put two or more parts into contact in HyperWorks for the OptiStruct (and other) FEM solvers: 1) To have a defined identical and connected mesh node pattern on both contacting surfaces 2) To have a defined "FREEZE" Contact definition between non-identical mesh patterns The first way - identical mesh patterns - is described in the first flash video attached to this post. There is a second video that describes the creation of identical meshes in case of unconnected contact surfaces (gap between the two CAD parts) The third video describes the automatic seupt of FREEZE contact between multiple parts. I also attached the HM 2017 models to reproduce the videos. Best Regards Jan 01_03_Kontakt_Geom.hm 01_Mesh_Identical.swf 02_Kontakt_Geom_Gap.hm 02_Mesh_Identical_Unconnectes.swf 03_Contact_Freeze.swf
  13. How can the display of the applied the load vector in HyperMesh be changed from the load tip to the load tail point? Answer: There is a display option (HyperMesh 2017) to change this display - see screenshots
  14. Question 1 I tried to create a Tetra Volumemesh, but unfortunately can't pick the surfaces that are requested in the menu Answer: Please change to the "Element" or "Comp" Selection in the submenu "Tetra mesh". This will allow to create a tetmesh based on surface elements. The submenu "Volume Tetra" asks for a selection of "CAD surfaces", which you do not have in your model. Question 2: I performed a re-analysis of my results. Now I will see two different result windows - one for the design results and one with the structural loadcase results. Is there an option to see the two results in one common result plot (= 1 result file with density and displacement results)? Answer: You can define the Entry "DENSITY, H3D, ALL" in your optimization inputfile (in HyperMesh through setup - create - control cards - DENSITY): this will allow to plot the displacement or stress contour on the optimized iso surface in HyperView (density and displacements will be in one common result file). Jan
  15. In addition, there are some more issues in your model: 1) the "bellkrank nondesign" parts are not connected to the shaft (2D mesh hits a 3D mesh, but there is no connection made) . Therefore no load is transmitted via this interface. I recommend to use a TIE Contact between the two parts. 2) The "rotation" of the shaft in the mounting will not transfer any load from the shaft to the SPC at the end of the mounting. You will get a rigid body mode. I would suggest to use a Slide Contact between the Shaft and the mounting, instead of the "Rigid + Revolute Joint". Another approach would be to use "Multibody dynamics" in solidThinking Inspire and model the kinematic behaviour first. After this, the resulting forces could be mapped to the single parts and then used for optimization.
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