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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Posted by: Bill Jones
Date posted: Mon Feb 28 19:27:08 US/Eastern 2000
Subject: Acceleration Factor (AF)
Greeting: Where can I get the equations of AF under different accelerated stress conditions and/or different dominant failure mechanisms? For example, for thermal fatigue, AF=(delta Ta / delta Tu)^m; for vibration fatigue, AF=(Ga/Gu)^m. Are these correct? And how to determine the index m. I find there are huge differences in m among different resources. Could I find some references which provide better equations and their parameters? Thanks a lot.


Subject: Acceleration Factors
Reply Posted by: Bruce Dudley ( )
Organization: Reliability Analysis Center
Date Posted: Wed Mar 8 15:58:02 US/Eastern 2000
Some sources that have information about accelerated testing procedures and equations for calculating or evaluating test data are: Reliability & Life Testing Handbook by D. Kececiogla, PTR Prentice Hall, Englewood Cliffs, NJ, 1993; Accelerated Testing Statistical Models, Test Plans and Data Analysis by W. Nelson, John Wiley and Sons, New York, NY, 1990; MIL-HDBK-344A, Environmental Stress Screening of Electronic Equipment, 1993. From MIL-HDBK-344, the acceleration factors for solder fatigue are: 2.5 for temperature cycling and 6.4 for vibration testing.

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