Dan

A great deal of work was done by Bell Laboratories in the 70's on this 
issue. Essentially, the procedure developed was to build a structure with 
the same same similarity structural parameters as the product or if possible 
use the actual product. Then subject the test specimen to a random vibration 
spectrum that had the same power spectrum as the actual environment. 
Obviously, this is not a back of the envelope, hand waving analysis, but if 
you want a serious analysis that can be relied upon, you have some work to 
do. There are several good books on the random vibration of plates. I would 
start there.

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389


----- Original Message ----- 
From: "Dan Skweres" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 08, 2008 10:03 AM
Subject: [TN] deflection data???


Good day all!
I have received an inquiry from a customer regarding deflection data. They 
want to know if there's any data they can input so they can simulate if 
their BGAs will be ejected off their PCBs in a high vibe environment. The 
PCB is a 14 layer FR-4 .062 thick. Any guidance would be greatly 
appreciated.
Thanks,
Dan S.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to 
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to 
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
for additional information, or contact Keach Sasamori at [log in to unmask] or 
847-615-7100 ext.2815
----------------------------------------------------- 

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------