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Considering a Use Stress Distribution in a Quantitative Accelerated Life Testing Analysis

Typical accelerated life testing analysis involves using failure data at different stress levels (e.g., different temperatures or loads) in order to build a life-stress relationship and generate a failure distribution at use conditions. The question that often arises is what fixed stress value should be used to represent the use conditions. Using a mean or median stress could result in an overly optimistic calculated reliability or life. On the other hand, using a worst case stress could yield an overly conservative estimate, making it challenging to meet the product's reliability requirements. This article presents a method to estimate reliability at use conditions by using accelerated life test data analysis and considering a use stress distribution instead of a fixed use stress.


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Congratulations to the 2015 ARS North America Excellent Presentation Award Winners!

ReliaSoft gives a big thank you to all the presenters, exhibitors, sponsors and attendees at this year's Applied Reliability Symposium North America for creating such a memorable event in Tucson, Arizona. Excellent Presentation Awards were given out to the top three presentations, selected based on votes cast by Symposium attendees.

This year's award winners are:

  • 1st Place (Gold) - Melanie Zoe Cox from GE Aviation for her presentation on Breaking Bad Weibulls
  • 2nd Place (Silver) - Georgios Sarakakis and Celine Geiger from Tesla Motors for their presentation on Swimming Upstream: The Road to Designing-in Reliability
  • 3rd Place (Bronze) - Amnon Ganot from Gertron Ltd. for his presentation on Lean (and Friendly...) FMEA

For more information, visit:


Videos on Fatigue & Durability Now Available

You are invited to view an online collection of videos that discuss wide-ranging ideas and advancements in fatigue and durability analysis. These videos were recorded at the 2015 HBM nCode Products User Group Meeting, an annual event focused on the latest and most pertinent topics in fatigue & durability, CAE and test & measurement technology. Watch the presentation videos here:

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