Forum: Reliability & Maintainability Questions and Answers
Posted by: Ray Moran ray.moran@otis.com (ray.moran@otis.com ) Date posted: Fri Feb 23 10:38:57 US/Eastern 2001 Subject: Capacitor Reliability Message: Hi, I have heard that aluminum electrolytics can outgas if subjected to high temperatures. Have any studies been done to quantify this effect as a fuction of temperature? I am using a miniature aluminum electrolytic rated at 105 C, and the max temp it will ever see is 80 C. Is it safe to assume that since I am operating well within the temperature range, any outgassing would be be negligible? Any advice or leads would be much appreciated. Thanks! Ray Moran
Posted by: Glen Hanington (ghanington@littlefeet-inc.com ) Organization:Littlefeet, Inc. Date posted: Wed Feb 21 15:18:03 US/Eastern 2001 Subject: Activation Energy in Arrhenius Equation Message: I've seen values of Activation Energy ranging from 0.3eV to 1.2eV in Finn Jensen's book Electronic Component Reliability, the AT&T Reliability Manual uses a value of 0.4eV, and MIL-HDBK-217F2 uses 0.423eV, while some Reliability Engineers use 0.7eV for a value. Without running extensive Life Tests at different temperatures, is there some way to estimate the value of Activation Energy for a system based on the percentage of different types of components used in the system? I want to arrive at an MTBF value for an expensive system using 3 samples and an MTBF goal of 70,000hrs, in as short a time as possible. Any suggestions?
Posted by: Neo Chee Siong (bre80033@nus.edu.sg ) Date posted: Tue Feb 20 8:50:11 US/Eastern 2001 Subject: Maintainability Index for Wet Areas Message: Does anyone know about the construction of a maintainability for wet areas?
Posted by: gembong b. (g.baskoro@tm.tue.nl ) Organization:PPK Date posted: Thu Feb 15 10:39:28 US/Eastern 2001 Subject: MEOST Message: I'm looking for a bit detailed guideline and or explanation the so called MEOST (Multiple Environment Overstress Test) Pls advice me if somebody know. gembong
Posted by: Glen Hanington (ghanington@littlefeet-inc.com ) Organization:Littlefeet, Inc. Date posted: Tue Feb 13 19:04:15 US/Eastern 2001 Subject: Component Reliability Database Message: Since we are a relatively new company and have not gone into production with our product yet, I want to develop a component reliability database which will track system operational hours, failures, failure rates, etc., which I can then use to generate more accurate product reliability predictions. I have 2 questions: 1) Is there a canned program that I can buy which will do this for me, or will I have to generate this myself. 2) Once I establish this database, would anyone else be interested in this information?
|
Copyright
• Privacy Policy
• Accessibility Statement
• Legal Notice
• Get Adobe® Reader® 
System Reliability Center • 201 Mill Street • Rome, NY 13440 • Phone (888) 722-8737 • Fax (315) 337-9932