From: Arthur W. Brooks
Sent: Wednesday, March 12, 2008 2:07 PM
To: Michael R. Kalish
Subject: Trim Coil Stress Analysis Update

Attachments: Revised.ppt

Mike,

I made some changes to the model as we discussed to more accurately reflect the design:

Angles Top and Bottom tied to coil with contact elements
No Friction assumed
Corner Plates attached to bottom angle
U-Bolts simulated by tying angles at discrete points
Assembly supported at 3 locations.
Radial legs unsupported

The model doesn't take credit for tying two trim coils together, but there will be cases when the peak running load is on the unsupported leg so I believe it is representative.

The displacements are fairly high due to the weak corners (~0.3") and the stresses in the supports high enough to drive you to something better than aluminum.

While I was working on this Phil stopped by. He thought it would be fairly cheap to have someone bend the angle to go around the corners. Two such pieces could be joined to form a full frame.

Any thoughts?

Art