Check this out http://www.dfrsolutions.com/thermal-cycling-to-service-life-correlation/
Hope it helps 


Greetings,
Ivan

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: 2011年7月8日 8:16
To: [log in to unmask]
Subject: Re: [TN] Acceleration Factors for Thermal Cycling

Hello All,
 
I posted this during the long weekend and did not get a response. Does anyone have some input on the following?
 
A colleague asked us the following question and we thought it would be good to post on TechNet.
 
"Is anyone aware of a spreadsheet that can calculate acceleration factors for conversion of PCB cycles to failure from one thermal cycle (e.g. -40/125C) to another (-20/80C)? Looking at IPC-TR-579 (Round Robin Reliability Evaluation of Small Diameter PTHs in PWBs), it seems like the equations presented in section 7 (e.g. Eq. 6) could be used to do this."
 
Best regards,
 
Paul Reid
PWB Inc.

 


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