Stress-Strength Interference: Difference between revisions

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The stress (load) is a lognormal distribution with Ln-Mean = 1.12 and Ln-Std = 0.243. The strength is a three parameter Weibull distribution with Beta = 1.69, Eta = 6.67, and Gamma = 3.2.  
The stress (load) is a lognormal distribution with Ln-Mean = 1.12 and Ln-Std = 0.243. The strength is a 3-parameter Weibull distribution with Beta = 1.69, Eta = 6.67, and Gamma = 3.2.  





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Stress-Strength Interference

This example compares the stress-strength interference results.


Reference Case

The data set is from Example 5.3 on page 129 in the book Practical Reliability Engineering by O’Connor and Kleyner, Wiley, 2012.


Data

The stress (load) is a lognormal distribution with Ln-Mean = 1.12 and Ln-Std = 0.243. The strength is a 3-parameter Weibull distribution with Beta = 1.69, Eta = 6.67, and Gamma = 3.2.


Result

The book used simulation to get the result. The probability of failure is 1.2%.


Results in Weibull++

In Weibull++, the probability of failure is 1.188%, as shown below.

SS interference plot.png