SRC Forum - Message Replies

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

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?

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Reply:

Subject: Part Stress Calculation
Reply Posted by: Berni Student
Date Posted: Fri Jun 11 7:53:39 US/Eastern 2004
Message:
> the dissipated is calculated from the circuit > design. > [...] > I do not believe that this is significant in the > determination of the device failure rate. Usually a circuit doesn't work in a stationary state and so currents and tensions aren't constant. If in a resistor R the tension applied is V = A + B*sin(w*t) How can I compute the dissipated power? P = V^2/R = A^2/R Or P = V^2/R = (A + B)^2/R And what about if the tension is switched on and off?

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