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by Fred Schenkelberg 1 Comment

Reliability Centered Maintenance

Reliability Centered Maintenance

Part of keeping equipment operational is affecting repairs appropriately. Sometimes it makes sense to replace an element of some equipment before it fails, i.e. automobile tires as the tread wears. Sometimes is doesn’t make sense to repair a functioning unit as the result would be a system that is less reliable then before. [Read more…]

Filed Under: CRE Preparation Notes, Maintainability and Availability Tagged With: failure mechanisms, maintenance, Maintenance Strategies, RCM

by Fred Schenkelberg 1 Comment

Root Cause Knowledge and Models

Root Cause Knowledge and Models

Two short questions to evaluate your knowledge of failure mechanisms (root causes) and common reliability models. The answers will be posted in a comment, later.

Which of the following failure root causes is most likely NOT due to power line variation (electronic-based product)?

A. Circuit design margin exceeded
B. Power dissipation
C. In-rush current response
D. Mechanical fatigue [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Testing Tagged With: failure mechanisms, reliability models, root cause

by Fred Schenkelberg 5 Comments

Life Testing Question

Life Testing Question

Hi Fred,

I would take this opportunity to ask the reliability guru about bathtub curve for hardware reliability. I am running 27 units for life test for a million cycles around 555 hours. I have one failure at 300,000 cycles, and the rest of the units are running fine. Would this be classified as an early life failure? Also, how do I make a determination of when the early life failure time interval ends and constant failure rate starts in this example based on failure rate of remaining units? Thanks. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Testing Tagged With: Early Life, failure mechanism, failure mechanisms, Failure Rate, failure time, hardware reliability, Life Test

by Fred Schenkelberg 4 Comments

Reading a Datasheet

Reading a Datasheet

Reading a datasheet to determine a reliability value may take some investigative work. Whenever I see a fit rate based on failure-free testing, I am curious about how they did the testing and the calculations. [Read more…]

Filed Under: CRE Preparation Notes, Probability and Statistics for Reliability, Reliability in Design and Development, Reliability Modeling and Predictions Tagged With: arrhenius equation, electrolytic corrosion, failure mechanism, failure mechanisms, Failure Rate, jedec standard, Poisson Distribution

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