Engineering & Analysis Methods > Crippling

Johnson-Euler Allowable Calculation Bug?

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jfross219:
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:
Hi Jared,

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

Thanks,

Brent

jfross219:
Hi Brent,

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

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