Mechanical Testing (Destructive Testing) (Leaving Cert Engineering): Flashcards
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Practise the cards
13 cards from this deck
Definition of fatigue
Definition of fatigue
Ability to resist failure under repeated loading
Key characteristic of fatigue failure
Key characteristic of fatigue failure
Unpredictable and can occur without warning
Load level when fatigue occurs
Load level when fatigue occurs
Below the material's ultimate strength
Type of testing method fatigue testing is
Type of testing method fatigue testing is
Destructive testing method
% of metal structural failures from fatigue
% of metal structural failures from fatigue
Approximately 80-90%
What specimens undergo in fatigue testing
What specimens undergo in fatigue testing
Repeated loading cycles until failure occurs
Pattern of load application in fatigue tests
Pattern of load application in fatigue tests
Cyclic pattern (loading and unloading)
Three key measurements in fatigue testing
Three key measurements in fatigue testing
Load level, number of cycles, failure mode
What engineers count in fatigue testing
What engineers count in fatigue testing
Number of loading cycles before failure
When does fatigue testing stop?
When does fatigue testing stop?
Fracture or signs of failure appear
Duration fatigue testing can take
Duration fatigue testing can take
Hours to weeks, sometimes millions of cycles
What fatigue testing predicts
What fatigue testing predicts
Component lifespan under real operating conditions
Design benefit of fatigue testing
Design benefit of fatigue testing
Optimize design to resist fatigue failure