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SergioV

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  1. SergioV liked a post in a topic by Koushik Chandrashekhar in Show "steps to follow" (commands)   
    Hi,
    I hope the below post helps you.
     
  2. SergioV liked a post in a topic by Simon Križnik in Shells and solid   
    Hi,
     
    there are many techniques to connect shell and solid elements:
     
    -using rigid elements
    -inserting a layer of shell elements inside solid elements
    -inserting a layer of shell elements on the face of solid elements


    shell2solid.fem
  3. SergioV liked a post in a topic by tinh in Beams no moment   
    Use CBEAM (1d>bar2)
  4. SergioV liked a post in a topic by Q.Nguyen-Dai in Meshing failed   
    @SergioV: You have 445 elements with aspect ratio > 20! So please make correction of your 2D mesh before filling 3D.
     
  5. SergioV liked a post in a topic by srinath_K in Meshing failed   
    hi sergiov,
     
    free edges are there in this region.Connect these nodes and do tet modeling.
  6. SergioV liked a post in a topic by Simon Križnik in Error ID 54 - Radioss   
    To obtain a steady state, quasi-static analysis both gears should be fully modeled to stay in contact throughout rotation, imposing constant velocity on rueda and gradually ramping up the moment load on pinion.
     
    Also check the following example:
    https://altairuniversity.com/wp-content/uploads/2012/08/Example_15.pdf
     
     
  7. SergioV liked a post in a topic by Simon Križnik in Error ID 54 - Radioss   
    You're welcome. The Like button is an easy way to show appreciation 
     
    1. I have overlooked that rueda had prescribed motion. Use Utiliy>BCs manager>Imposed displacement or Imposed velocity to set up a rotation on the master node of RBE2 element of rueda. (XX axis of rotation).
     
     
    2. Rueda and pinion have blocked all DOF except X axis rotations (similar to the original model). This allows the moment to act on pinion, avoids incompatible condition on rueda and prevents rigid body modes.  
     
    3. If the moment load is applied suddenly (without ramp up) it will induce inertial dynamic effects becoming impact analysis instead of quasistatic.  
     
     
    Following the unit consistency of N, mm, ton, s the moment load is 200.000 Nmm- is this correct?
  8. SergioV liked a post in a topic by Simon Križnik in Error ID 54 - Radioss   
    Actually, RBE2 elements can be used.
     
    Contact interface type 3 is set up with contact surfaces.
     
    Simulation controls are defined by utility>engine file assistant.
     
    The moment load is linearly ramped up to avoid inertial effects.
     
    A coarse (automesh) and fine model is attached.
     
    Note after 8e-3 seconds for some reason there are severe deformations.
    2D - achafl_edit_fine.hm
    2D - achafl_edit4_coarse.hm
  9. SergioV liked a post in a topic by Simon Križnik in Error ID 54 - Radioss   
    The following modifications were made:
    -for plane strain analysis, the elements must be defined in YZ plane and their normals have to be in the positive x-position, so the model was reoriented
    -P1_SHELL property is not allowed so it was changed to P14_SOLID
    -SHELL element type is not allowed so was changed to QUAD  using 2D>elem types>2D & 3D>quad4 + pick all elements and update
     
    Rigid bodies were placed in a separate component without Part card image. However, rigids are not allowed in this type of analysis, so they should be deleted.
     
    rigid bodies also cause error 54
     
    2D - achafl_edit.hm
  10. SergioV liked a post in a topic by Simon Križnik in Error ID 54 - Radioss   
    Hi,
     
    Use Tools>Model Checker>RadiossBlock to find modeling errors.
    https://insider.altairhyperworks.com/wp-content/uploads/2017/09/T-T-1248-HyperMesh-Model-Checker.pdf
    Share the model if the issue persists.
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