In this issue:

Issue 90, August 2008

*Hot Topics
*Reliability Basics
*Tool Tips
*Latest Software Updates
*Hot News
*Contribute to HotWire

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Hot Topics

Using ALTA with Multi-Stress Physics of Failure Models
In the "Reliability Prediction Methods for Electronic Products" article in Volume 9, Issue 1 of the Reliability Edge newsletter, we presented several physics of failure models for electronic components. The article included an example of data analysis with ReliaSoft's ALTA software using an Arrhenius model. However, many physics of failure models are formulated such that they cannot be used with the one- and two-stress models available in ALTA Standard. In this article, we will analyze accelerated test data using the Peck model for corrosion in aluminum devices, using the General Log Linear model in ALTA 7 PRO.

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Reliability Basics

Estimating the Expected Number of Failures for Items with Minimal or Perfect Repair
The area under the failure rate curve constructed from the first times-to-failure of a set of components is often used as an estimate of the number of spare parts needed during a mission. This method of estimating spares is applicable only under certain conditions. The primary assumptions of the method are that minimal repair is performed on the components in the population and that the size of the population remains constant over time. However, in many cases, reliability engineers erroneously apply the method to estimate the number of failures of non-repairable components. This article uses an example to clarify when it is appropriate to estimate the number of failures using the area under the failure rate curve and when other methods must be employed.

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Tool Tips
  • Can I add records "out of order" in Xfmea and RCM++?
  • What are the status/function indicators on blocks in BlockSims RBDs?

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Latest Software Updates
A new service release is now available for BlockSim (SR 7.0.4). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...


Application Date Created Version
BlockSim 7 7/9/08 7.0.4
Hot News
* Certified Reliability Professional (CRP) Program - ReliaSoft's Certified Reliability Professional (CRP) program has been designed to distinguish professionals who have gained and successfully demonstrated unquestionable expertise in the field of reliability engineering. To achieve certification, candidates must complete a series of training courses focused on important reliability engineering topics, successfully apply the learned body of knowledge in the workplace and publicly present this expertise in an industry conference or journal. For more information about this certification program, please visit
* Congratulations to CRP Graduates - In recognition of outstanding achievement, we had the distinct honor and pleasure of publicly awarding two individuals with the Certified Reliability Professional certification at the Applied Reliability Symposium (ARS) in Reno: Daniel B. Farley of Delphi and Greg Smith of Whirlpool.
* Call for Presentations - ARS, North America - The committee is currently soliciting presentation proposals for the 2009 International Applied Reliability Symposium, North America, which will be held June 10 - 12, 2009 in San Diego, CA. If you are interested in learning more about this opportunity, please review the detailed instructions and milestones posted at The final deadline to submit presentation proposals will be December 5, 2008. Put on those thinking caps and get your outlines to us in a timely manner this is your chance to win one of next year's Excellent Presentation Awards and the prize that comes with it!
Upcoming Public Training Event Calendar
August 2008
August 21 - 22, 2008: RS 480 RCM Principles and Applications in Chennai, India
August 25 - 29, 2008: MSMT Foundations in San Diego, California
September 2008
September 3 - 5, 2008: RS 560 Fundamentals of Design for Reliability in San Diego, California
September 22 - 26, 2008: MSMT Foundations in Warsaw, Poland
September 22 - 24, 2008: RS 522 Advanced System Reliability / Maintainability Analysis in Tucson, Arizona
September 22 - 24, 2008: RS 560 Fundamentals of Design for Reliability in Bangalore, India
September 25 - 26, 2008: RS 470 Failure Modes, Effects and Criticality Analysis in Tucson, Arizona
October 2008
October 1 - 3, 2008: RS 560 Fundamentals of Design for Reliability in Manchester, UK
October 8 - 10, 2008: RS 521 Advanced Accelerated Life Testing Analysis in Turin, Italy
October 13 - 17, 2008: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Paphos, Cyprus
October 15 - 17, 2008: RS 525 Simulation Modeling for Reliability and Risk Analysis in Tucson, Arizona
October 20 - 21, 2008: RS 470 Failure Modes, Effects and Criticality Analysis in Singapore
October 22 - 24, 2008: International Applied Reliability Symposium in Singapore
October 27 - 31, 2008: MSMT Foundations in Tucson, Arizona
Contribute to HotWire
Contributions Welcomed
As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.

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