Fatigue Testing (Leaving Cert Engineering): Flashcards
📚Flashcards
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13 cards from this deck
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Practise the cards
13 cards from this deck
What is fatigue in materials?
What is fatigue in materials?
Ability to resist failure under repeated loading
Key characteristic of fatigue failure
Key characteristic of fatigue failure
Unpredictable
Load level when fatigue occurs
Load level when fatigue occurs
Below the material's ultimate strength
What fatigue testing is
What fatigue testing is
Destructive test simulating repeated loading conditions
% of metal structural failures due to fatigue
% of metal structural failures due to fatigue
80-90%
Why fatigue failure is particularly dangerous
Why fatigue failure is particularly dangerous
Can occur suddenly without visible warning signs
Example of fatigue in aircraft
Example of fatigue in aircraft
Wings flex repeatedly during flight
Loading pattern used in fatigue testing
Loading pattern used in fatigue testing
Cyclic pattern (loading and unloading)
What is 'load level' in fatigue testing?
What is 'load level' in fatigue testing?
Magnitude of force applied during each cycle
What is measured by 'number of cycles'?
What is measured by 'number of cycles'?
How many loading cycles occur before failure
What is 'failure mode' in fatigue testing?
What is 'failure mode' in fatigue testing?
How and where the material eventually fails
Key benefit: predicting from fatigue testing
Key benefit: predicting from fatigue testing
Component lifespan under real operating conditions
How fatigue testing helps design
How fatigue testing helps design
Optimise component design to resist fatigue failure