Weibull

Weibull

1. Used to model

   • Time to fail
     • Time to repair
       • Material strenght

2. Two types

   • Three parameter
   • Two Parameter

3. B = shape parameter

   • gives Weibull its flexibility
   • B < 1 = early life failure
   • B > 1 = wear out
   • B = 1 : constant failure rate

4. scale parameter

   • determines the range of the distribution

5. location parameter

6. Accurate Failure analysis & Failure Forecasts with small samples

   • which allows for cost effective testing

7. Provides a simple and useful graphical plot

8. Useful for maintenance planning, particularly RCM