Mesh elements


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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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)
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
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?