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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

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

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Original Message:

Posted by: Berni (berni.itNO_SPAM_REMOVE@tiscali.it )
Organization:Student
Date posted: Thu Jun 3 2:46:33 US/Eastern 2004
Subject: Part Stress Calculation
Message:
When I perform a part stress analysis (MIL 217F2)which electrical condition should I use? For example, if I have a resistor with a sinusoidal tension applied, how can I compute the actual power dissipation? Should I use the max or the mean tension?


Reply:

Subject: Stress Analysis
Reply Posted by: bwd (bdudley@alionscience.com )
Organization: RAC
Date Posted: Wed Jun 9 15:37:04 US/Eastern 2004
Message:
The part stress analysis for a resistor is computed by dividing actual power dissipated by rated power. Rated power is the manufacturers specified values and the dissipated is calculated from the circuit design. if you do not have such information, then one should use the part count section of MIL-HDBK-217 as it contains default values for the variables. With regard to the sinusoidal tension, I do not believe that this is significant in the determination of the device failure rate.


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