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Author Topic: Johnson-Euler Allowable Calculation Bug?  (Read 252 times)

jfross219

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Johnson-Euler Allowable Calculation Bug?
« on: June 08, 2017, 10:42:58 AM »
I am analyzing a metallic, stiffened panel and came across an error in the reporting of the Johnson-Euler Interaction allowable (Screenshot attached).  Using the equations associated with the documented method, The Pje is calculated to be approximately 881.6 lb/in, but the report shows a 904.6 lb/in.  The margin of safety reported reflects the 881.6 lb/in allowable, plus some round off.  Is there another factor that I am missing that would cause the discrepancy in allowable reported?

Thank you,

Jared

Brent

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Re: Johnson-Euler Allowable Calculation Bug?
« Reply #1 on: June 08, 2017, 03:23:22 PM »
Hi Jared,

What stiffened panel concept are you using(I,J,Z,etc)? Is it a smeared or discrete stiffened panel?

Thanks,

Brent

jfross219

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Re: Johnson-Euler Allowable Calculation Bug?
« Reply #2 on: June 08, 2017, 03:43:10 PM »
Hi Brent,

I am using a Non-FEA, smeared stiffened panel with Z-fastened stiffeners.