Mesh elements

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

hello,

 

when I mesh my model (units in mm)- Belleville washer using quads I get around 8000 quad meshed elements. But when I use the same model (units in inches) and mesh it using quad elements I get only 1000 quad meshed elements.

moreover the model has a failure index of 0.91 using material properties >> optistruct >> MAT 8 card units>> lbf/in^2

and at the same time, for the same  model the failure index goes up to 1.208 when I change the material properties to MPa.

 

Why is this happening?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2015

    Hi Stritej,

     

    could you please let us know what is the element size when the model is in mm and when it is inch?

     

    Have you changed the mesh size accordingly?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2015

    CASE - mm

    element size = 1.800

    mesh type = quads

    total mesh elements = 17100 (finer mesh)

     

    CASE - inches

    element size = 6.001e - 01 (0.6001)

    mesh type = quads

    total mesh elements = 246 (coarse mesh compared to case mm)

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    Depends on how you are scaling your model,

     

    If your geometry is in inches scale > and you use 0.6 > you should have more elements,

     

    Take your mm model, scale it to inches by going to tool > scale > give the conversion factor for inches > 25.4? then mesh with your required element size for inches

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