Example: Test design to demonstrate reliability given a stress distribution

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Assume that the following date set is random sample of usage loads for a particular component in some unit U.

  • 480
  • 645
  • 720
  • 950
  • 975
  • 1,175

Furthermore assume that we wish to achieve, as well as demonstrate, a reliability of 99.9% at a 90% confidence in our design. Step 1 Using Weibull++ a Weibull distribution was fitted to the data:

  • Distribution: Weibull-2P
  • Analysis: RRX
  • Ranking: MED
  • Beta: 3.2839
  • Eta (U): 919.9457
  • Rho: 0.9901
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