SRC Forum - Message Replies
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
Posted by: Berni
Date posted: Thu Jun 3 2:46:33 US/Eastern 2004
Subject: Part Stress Calculation
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?
Subject: extreme value analysis
Reply Posted by: bwd
Date Posted: Fri Jun 11 9:30:15 US/Eastern 2004
If the stresses are variable as you are indicating, you need to perform a worst case extreme value analysis of the individual components. There are a number of books that describe this process which is time consuming but very exacting when this type of detail is necessary. The RAC web site for products describes our worst case handbook. Generally, when one is predicting reliability of components, you select a default parameter that represents the average stress conditions. But in those circumstances where safety is a concern, you should apply the worst case analysis.