From: Campell, Marc []
Sent: Tuesday, June 21, 2005 9:03 PM
To: Mark E. Melton
Cc: Hascall, Patrick A
Subject: FW: Corner Radii on X-LAT
I found this embarrassingly old email that closed the issue. I did take a while for Spectrum to agree & then to update the 00040, which now reflects the .125" (3.18mm) radius below. So yes this is closed.
Have you verified that the recent 00040 drawing updated closed the issue raised in X-LAT MRR RFA #2.  I'm waiting for confirmation of this from you before I officially close it.

Marc Campell
Mechanical Systems Mgr.
(650) 926-4658


From: Herzberg, Scott Alan
Sent: Wednesday, June 09, 2004 9:36 AM
To: Campell, Marc; 'Wu, Sylvia'
Subject: FW: Corner Radii on X-LAT


From: Opie, Michael V.
Sent: Wednesday, June 09, 2004 9:20 AM
To: 'Edinger, Derek'
Cc: Reynolds, Gary; McHugh, Stuart; Herzberg, Scott Alan; Ku, John
Subject: RE: Corner Radii on X-LAT

Great! That sounds reasonable. I'll tell Scott Herzberg that he can keep the 0.125 radius.
Thanks a lot for the effort.

From: Edinger, Derek []
Sent: Tuesday, June 08, 2004 6:57 PM
To: Opie, Michael V.
Cc: Reynolds, Gary; McHugh, Stuart
Subject: Corner Radii on X-LAT

I checked my original, detailed X-LAT model with the nominal corner radius of 0.125 inch and got 13 ksi from the offset case plus 7 ksi from MECO which results in a MS on ultimate of -0.2 (with a qual-by-analysis SF = 2.6). 
When I added shear springs to the edge fasteners, it didn't have much affect on the stresses (around 1% reduction).  After looking at the deformed shape I realized most of the stresses come from plate bending due from the offset case which is relatively unaffected by the joint shear stiffness.  However, when I added axial springs, the stresses dropped significantly.  I calculated an axial stiffness of 2.7E6 lb/in for the clamped joint from Shigley.  With this spring stiffness in the model, I got 2 ksi from the offset case plus 3 ksi from MECO which results in a MS on ultimate of 2.7 (with a qual-by-analysis SF = 2.6). 
Based on these results, it's okay to keep the 0.125 inch radii in the corners.