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Shell Coating Solids (Strain Gage Simulation)

Shell Coating Solids (Strain Gage Simulation)

Shell Coating Solids (Strain Gage Simulation)

(OP)
Hi,
I'm shell coating solid finite element geometry (parabolic tetrahedron elements)to do some correlation work with strain gage test data.  Is there a good rule of thumb for what thickness the thin-shell element should be when you're trying to simulate a strain gage?  What experiences have you had with this technique?  Any other FE techniques available to get at surface strains?  I'm running I-DEAS/UGS 11m2.

RE: Shell Coating Solids (Strain Gage Simulation)

If you have sufficient mesh density then the extrapolated element nodal stress should equal the surface stress. I avoid shell coating since it adds unneccessary degrees of freedom to my models and is another source of modeling errors. Instead I just probe a consistent node where my strain gauge should be.

If you have to surface coat , then just anything really thin, like 0.01 mm and ignore any software warnings about ill-conditioned matrix.

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RE: Shell Coating Solids (Strain Gage Simulation)

(OP)
Thanks for the information.  I was getting singularites due to the very thin shell (0.001 inch thick) that I was using to coat the solids (as you mentioned).

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