Linking the relationship between a body with another

2

Comments

  • tungfwtungfw Member Posts: 31
    edited March 2019
    OK will modify it soon, but I need try whether this model can be used, let's assume both are cushion material. When I just want to try mesh the baby only it already took me about 10min for a default meshing. My laptop has 4 core and 920 Nvidia, I scare it may took a long time and the simulation output is error?
  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    Maya creates too many long thin triangular faces which makes the meshing slow down. Do some SpaceClaim tutorials on this site and learn SC.  Either build the car seat and baby from scratch in SC or learn how to replace Maya's collection of faces that represent one smooth face with one smooth face in SC.

    Many of the parts of a car seat are thin-walled parts. For those parts, you want a surface, not a solid body. For example, below is the back face (approx) of the chair part which could represent the midsurface of a thin-walled part that is the hard-plastic molded shape of the chair. You can easily mesh this in mechanical and assign the thickness to that surface.

    Here I have used the Merge Faces tool on the Repair tab of SC to combine a row of triangles into a single face.

  • tungfwtungfw Member Posts: 31
    edited March 2019
    Understood. Merge faces tools is great! Gonna merge the faces. Hi Peter, how much mesh sizing you use to mesh? The above seat back you create on your own? I will look on it. Actually I'm bad at using either solid work or space claim to do surfacing, that's why I'm using Maya ?which I still OK with. Tonight gonna upload an archive file here. Brb
  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    The seat back above was made by copying those faces off the back of your model.

  • tungfwtungfw Member Posts: 31
    edited March 2019

    Hi Peter,

    I have modify the faces and the back seat. I'm currently gathering the properties of the all bodies (material etc.), I've success done the meshing and it's about 130k elements. What I gonna do next is applying material properties, applying profiles and boundary condition.

    *I have uploaded my current progress

  • tungfwtungfw Member Posts: 31
    edited March 2019

    Hi Peter, I don't know why can't add post through that so I screenshot.

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    Looks good.  This site interprets the text typed in the post as code so it can render special characters, but if some code is found and it's not valid, then you can't post. 

  • tungfwtungfw Member Posts: 31
    edited March 2019
    How can I know estimated time finished like explicit does? I have already run for 2 hours and looks like not even 5% overall process. I'm using time step and I see most of the tutorial used substeps, will it decrease the simulation time? Just now I encountered a error which sounds ' a random element has highly distorted, offecing bla bla bla, I changed mesh size and BC and its gone, I don't know am I doing it right haha
  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    I can't post my reply.

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019
  • tungfwtungfw Member Posts: 31
    edited March 2019
    Automatic time stepping is on. I set 10ms as new time step. Because its keep updating I can't scroll to the number of equations. 8gb ram, and 4 cores. Yup I saw the incore out core things in the solver output. My incore is higher but it just used like one quarter of it, and how to ask the Ansys to fully used? ?I think it's just used 2 cores some commands pop up, I saw.
  • tungfwtungfw Member Posts: 31
    edited March 2019

    The system

    The error i always have

  • tungfwtungfw Member Posts: 31
    edited March 2019

    I found the way to change the maximum core, but when I change to 4, it appeared error. 572199 equations by the way.

    Local memory allocated 542mb

    Local memory required for in core 2309mb

    Local memory reqyjed for out core 499mb

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    Did you follow the advice in the error to turn on Identify Element Violations on the Solution Information folder?

    Show an image of the elements that are becoming highly distorted.

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019
  • tungfwtungfw Member Posts: 31
    edited March 2019

    Hi Peter, 

    Yes I had the same problem as the last image you posted. The element which highly distorted I have create a name selection but the error still occur. 

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    Okay, so reply with the image of where the highly distorted element is,

    Change the thin parts, like the straps, from solid to sheet body and mesh with shell elements.  You have to set the geometry to Mixed Import Resolution: Surfaces and Solids.

  • tungfwtungfw Member Posts: 31
    edited March 2019

    Bodies with one element through the thickness image. Currently running with identity element violation on with 10. Will share the result soon.

     

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    Since there are only a few small bodies with one element through the thickness, use Mesh Controls to force them to have at least two elements in each direction.

    I expect there are a lot of elements to fill the solid volume of the baby. Since this is just an approximate representation of the baby, in SpaceClaim, you could copy all the surfaces from the baby and paste them in, then delete the solid.  The surfaces will be meshed with shell elements that get assigned a thickness. This will greatly reduce the number of equations the solver has to solve at each time step, reducing your wait time.

  • peteroznewmanpeteroznewman Member Posts: 11,054
    edited March 2019

    This Discussion has gotten rather long. Please pick a post to mark as Is Solution to indicate that the original question was answered.  Start a New Discussion for questions about problems with Transient Structural.  In that new discussion, you can put a link back to this discussion for reference.

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