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Showing content with the highest reputation since 09/17/18 in all areas

  1. 2 points
    Adrian Azorin

    Friction in RADIOSS

    Hello, I have a couple of questions regarding friction modelling in RADIOSS: - Is it possible to define different values of friction for different parts inside the same contact? In LS-DYNA this can be done by using the *DEFINE_FRICTION card, but I have not managed to find the equivalent for RADIOSS. In this way we avoid defining different contacts for each part with a different friction. - Is it possible to make friction inside a contact different in two principal directions? In LS-DYNA this could be done through the ORTHO_FRICTION option in the contacts. Many thanks in advance Best Regards, Adrian
  2. 2 points
    Hello Pandurang, I suggest you to type following keyword to your .inp file under *step section; *el print peeq, *node print u, these codes writes desired results to .dat file. Thus, you can parse that file to obtain results by tcl or python scripts
  3. 2 points
    George P Johnson

    import & mesh

    Hi, Open HyperMesh with Abaqus as your user profile and import the CAD file (File>Import>Geometry, select the file format (STEP/IGES) and select the CAD file). Now you can create the FE model (meshing, assign materials,properties, loads...etc) and finally you can export (File>Export>Solver Deck) for solving. Many tutorials on HyperMesh - Abaqus interface are available in the Help and I recommend you to go through.
  4. 1 point
    Ivan

    Error jacobian

    Sure, first create 2D elements with 2D Automesh panel (F12) on the top surfaces of solids. Then use these 2D elements to create the 3D hexa mesh in two different ways: -if the component has constant thickness you can use 3D>elem offset>solid layers panel -for better mesh control in the thickness direction use the 3D>solid map>general panel and select 2D elements to drag After Hexa mesh is created delete the 2D elements. Is there a reason to split the solid in such a pattern? Otherwise, only washers should be split around holes.
  5. 1 point
    Hi Phat Vu I checked your file. This error is due to the presence of Quad4 shell elements in your model which has no defined property. Try deleting the quad4 elements using Delete > Elem > by config > quad4 and then run the analysis. The analysis has completed from my end.
  6. 1 point
  7. 1 point
    Prakash Pagadala

    Hex mesh

    @Mrt We are improving our system consistently along with adding new learning material on Learning Library.
  8. 1 point
    Ivan

    Incompatible attribute (ATTA) item codes

    Hi luckyluke, please look into the attached attribute compatibility chart. DRESP1 - Responses and Attributes.pdf
  9. 1 point
    Ivan

    BC with certain displacement allowed

    Hi Daniel, I do not think that Boundary conditions can model such behavior directly, as they do not allow to be updated during the simulation. My suggestions would be to model end stops as: -type 4 springs attached between cylinder nodes and dummy nodes with fixed BCs and non-linear stiffnes curve to model end stop constraint. -contact interface defined between 2 rigid planes with fixed BCs perpendicular to x axis at the limit distance as master surfaces and cylinder nodes as slave.
  10. 1 point
    maybe: *createmark nodes 1 "by tag name" N-9001 ???
  11. 1 point
    @pohan add this line so that by default it will take script directory. set dir [file dir [info script]]
  12. 1 point
    Sundaram

    shells on interior solid faces

    Hi 3D---> detach all elements (not detach from, simply detach) ---> take faces for detached elements, now give equivalence to all detached elements (shift +F3), now F10 ---> 2D --> Duplicates--> save failed Create new collector in model browser --> organize all the saved elements in the new collector by using 'retrieve elements'
  13. 1 point
    Prakash Pagadala

    About Flexible bodies

    Not sure what you mean by methods similar to modal analysis?
  14. 1 point
    Prakash Pagadala

    About Flexible bodies

    Because to estimate internal response (like stress) for the applied external loads
  15. 1 point
    Pranav Hari

    About Flexible bodies

    Hi Lokesh Katari Rigid bodies are ideal representations of solid bodies or parts of fixed shape and size. They are highly useful in simulations where deformation of a part is negligible. A rigid body has 6 DOF, and each rigid body added to a system adds an additional 6 DOF. Flexible bodies, or flex bodies, are used to model elastic deformation of bodies in a system. The flex body connects to its neighboring elements and bodies through interface nodes.
  16. 1 point
    Pranav Hari

    Can't create 3D mesh

    Hi Iulen The free edges on the model has been fixed and the file is shared with you. You can now do 3D tetra meshing as it encloses a volume.
  17. 1 point
    Prakash Pagadala

    SPC with curve

    Especially for MBD related.
  18. 1 point
    If this is what you are looking for, CMS is not a modal analysis and this can be used in structural analysis as well. To learn more, please refer to Finite Element Analysis (Superelements)
  19. 1 point
    Below cmd could work: *createmark comps 1 "contains value" name apples* 1 puts [hm_getmark comps 1]
  20. 1 point
    Livil Lyle

    TCL Scripting

    Hello Punith, You can try the below, *createmark surf 1 "displayed" catch {*solids_create_from_surfaces 1 4 -1 2} status; if {$status == 1} { puts "Solid Created Successfully"; } else { puts "Solid Creation Failed"; } to create using loops, please give more information.
  21. 1 point
    ahenkes1

    Remove chamfer

    I have these chamfers in my model, is there a way to get rid of them? (Hypermesh 2017)
  22. 1 point
    George P Johnson

    Element Duplication (Overlapped)

    Hi Nut, In order to fix the duplicate elements go to check elems menu (F10) >>duplicates >>save failed. Now go to delete (F2) menu select elements >>retrieve >>delete entity. This will delete the duplicate elements from the model.
  23. 1 point
    Q.Nguyen-Dai

    how to control the node numbering?

    Here's: macro.zip
  24. 1 point
    John Brink

    Q&A from Day 2

    Chapter 2: Intro to Explicit Methods 1. What types of physics are best analyzed using implicit methods? Why? Simulations that are static (slowly applied loading), because there is little or no inertia involved. 2. What types of physics are best analyzed using explicit methods? Why? Simulations that are dynamic, highly non-linear, and transient (short duration). 3. How is the solution time step related to the speed of sound? The solution time step is inversely proportional to the speed of sound. So, if the material is stiffer (higher modulus of elasticity), the speed of sound increases resulting in a lower solution time step. 4. What physical parameters control the speed of sound? What modeling parameter affects the solution time as a result? Both material modulus and density control the speed of sound. Thus, to keep a stable solution, the sound (or shock) wave through a medium must not pass across more than one element per time step. This implies that the length of the element is the modeling parameter that affects the overall solution time. Chapter 3: Running a RADIOSS Simulation 1. What is the purpose of the RADIOSS Starter file? The RADIOSS Engine file? The Starter contains definition of the model (e.g. nodes, elements, properties), while the Engine contains the run controls (e.g. termination time, animation output requests). 2. What advantage is there to having two input files: Starter and Engine? The setup makes it easy to run a restart file. Also, just the starter can be run first to check for warning messages before having the engine run the simulation. 3. What does a block define in the RADIOSS input deck? A RADIOSS block defines one feature of the model (e.g. node definition, definition of a material). 4. What character denotes the start of a new block? Each block starts with the character “/”. 5. What characters can be used to put a comment in the input deck? Either a “#” or “$”. 6. What file should you look at to view any errors or warnings after running the Starter? The input deck runname_0000.rad will generate an output file from the Starter called runname_0000.out that will contain any errors or warnings related to the model definition. Chapter 4: Element Formulations 1. What assumption(s) are being made when using shell elements? Shell elements do not calculate a stress through the thickness of the shell (normal stress). 2. What causes hour-glassing of a shell element? To be more CPU efficient, explicit codes typically have one integration point on the face of a shell element. Non-physical “hourglassing” modes can result due to numerical instability of the shell. 3. How many integration points through the thickness of a shell are recommended to capture bending? At least five integrations points should be used through the thickness of a shell. 4. When would small strain formulation be useful for solid elements? When defining foam materials (Law70). There are also situations where switching to small strain formulation can help the time step from dropping too much due to excessive deformation. 5. For what types of problems would thinning of the shell element be important? Certainly for metal forming simulations or any problem where the physics of the results change as a result of thinning of the shells. 6. What type of situations require solid elements? Any case that requires three-dimensional resolution of stress. 7. What physical entities could be modeled with spring elements? Many applications. Examples are joint definitions used in dummy modeling, seat belt looped through a D-ring, etc.
  25. 1 point
    please locate your working directory by right click on hm icon > properties > start in field In this location delete the hmsettings.tcl, hmmenu.set and command.cmf. also hwsettings.xml
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