FEA vs. Strain Gage analysis
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Posted by: larryfoley ® 02/21/2008, 23:34:51 Author Profile eMail author Edit

I am trying to reconcile stress and strain values from strain gage analysis to those determined by Cosmos DesignStar nonlinear FEA. The values differ by as much as 160%. Does anyone have any ideas where the differences may come from? The FEA values are at elements under the strain gage locations. Thanks,

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Re: FEA vs. Strain Gage analysis
Re: FEA vs. Strain Gage analysis -- larryfoley	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 02/22/2008, 07:16:50 Author Profile eMail author Edit

Sounds normal to me, the differences can be attributed to many variables. Material characteristics imperfect (normal), complex imperfect geometry (normal), assembly induced stresses (normal), loading not applied exact (normal), strain gages not calibrated perfect (normal), insufficient mesh density, etc. Unless you have simple, almost perfect geometry, strain gages calibrated perfect, no assembly induced stresses you will always have differences between analysis and measured. Modified by Kelly Bramble at Fri, Feb 22, 2008, 07:17:46

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