Definition:
Mean Time to Failure (MTTF) is the average time a non-repairable device or system operates before failure. MTTF is calculated as the inverse of the constant failure rate λ.
Key Points:
- MTTF = 1 / λ (failure rate).
- Applies to components not designed to be repaired.
- Heavily used concept in machinery safety.
Example:
A single-use rupture disk might have a MTTF of 1,000,000 hours. This reflects its high reliability under normal operation
See Also: mean time between failure (MTBF), failure rate
Cited Source:
- IEC 61709:2017
- Limble article – Guide to Understanding Failure Metrics