19-06-2014, 10:59 AM
BATHTUB CURVE
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Bathtub curve
In the 1950’s, group known as AGREE ( Advisory Group for the Reliability of Electronic Equipment) discovered that the failure rate of electronic components had a pattern similar to the death rate of people in a closed system and systems follow the classical bathtub curve.
The typical bathtub curve and its standard shape have been widely accepted as an engineering tool in reliability management and training.
The infant mortality period/ Early failures
The infant mortality period is a time when the failure rate is dropping, but is undesirable because a significant number of failures occur in a short time.
It is characterized by high failure rate and the items become less likely to fail as their survival time increases.
End of life
A “wear out” period where the failure rate increases due to critical parts wearing out.
As they wear out, it takes less stress to cause failure and the overall system failure rate increases