From: Mark Campbell [mc288@cornell.edu]
Sent: Monday, April 22, 2002 9:53 AM
To: jana@vt.edu; robert lee schlender
Cc: mc288@cornell.edu; E. Lucien Cox, Jr.
Subject: inserts


>Jana and Rob:

I will be on travel this afternoon when the telecon occurs, but I wanted to 
give you an update on the inserts.

All inserts that we are using are made of Al 2024-T4, which is a Table IIIB 
material. This implies that there are issues with stress, corrosion, and 
cracking. Document MSFC-STD-3029 discusses the materials and their 
classification. This document also states, under the Table IIIB, that 
"Mechanically stress relieved products (TX5X or TX5XX) shall be specified 
where possible."

I spoke with the vendor (Young Engineers) from whom we bought the inserts. 
They indicated the following:
1. The material used in the inserts is actually a stress relieved material, 
T351. They indicated we should have received a set of test reports with the 
CofC's, but we cannot find them. We are trying to get them faxed to us asap. 2. There is an anodized coating on the inserts for corrosion protection. 3. We could also add a coating of alodine for additional corrosion protection 4. These inserts are currently used to fasten seats to aircraft floor 
boards; thus they have a strong heritage of being used in stressful 
environments for longer periods of time.

So, the big question today is, can we used stress relieved products here? 
Note that we are using the inserts to attach boxes to the center shelf, not 
as our primary structural component. We can also get the test reports and 
send them to Fred if he wants.

Thanks.

Mark



Professor Mark Campbell
Sibley School of Mechanical and Aerospace Engineering
Cornell University
208 Upson Hall
Ithaca, NY 14853
(607)255-4268 (voice)
(607) 255-1222 (fax)
www.mae.cornell.edu/campbell