December 9, 2016
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In reliability engineering, a bathtub curve is a particular form (shape) which the hazard function of a system can take. Its namesake is the cross-section of the typical bathtub: relatively steep slopes on either side with a relatively flat section in between. This corresponds to:
- a decreasing failure rate at the beginning of the expected life of the system (due to ‘infant mortality’ or ‘early failures’), followed by
- a relatively constant failure rate in the middle of the expected life of the system, followed by
- an increasing failure rate towards the end of the expected life of the system (due to ‘wear-out’ failures).