One of the time-honored conventions of aviation journalism is that every article about metal fatigue has to start with mention of the “ill-fated Comet.”
That requirement has now been met.
When Airplanes Feel Fatigued
Key Takeaways:
- Metal fatigue is a long-understood phenomenon where repeated stress causes materials to fail below their ultimate strength, often remaining undetectable at the microscopic level until catastrophic cracking occurs, and its behavior varies significantly by metal type (e.g., aluminum lacks a clear fatigue limit).
- In aviation, fatigue is a critical and often hidden structural threat, exacerbated by the need for lightweight designs and the high-frequency stresses from components like engines, making early detection extremely challenging until visible cracks or failures manifest.
- The issue of metal fatigue is predicted to become more prevalent and challenging in the future due to the increasing average age of the civil aviation fleet, higher aircraft utilization rates, and the repurposing of high-stress military aircraft for civilian roles.
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