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Describe the differences between metal fatigue and metal creep. - Leaving Cert Engineering - Question e - 2007
Question e
Describe the differences between metal fatigue and metal creep.
Worked Solution & Example Answer:Describe the differences between metal fatigue and metal creep. - Leaving Cert Engineering - Question e - 2007
Step 1
Describe Metal Creep
Answer
Metal creep is defined as the slow deformation of a metal under a constant load. This phenomenon typically occurs over time, especially at elevated temperatures. Factors such as high temperatures and prolonged exposure to stress contribute significantly to the occurrence of creep.
Step 2
Describe Metal Fatigue
Answer
In contrast, metal fatigue refers to the failure of a material due to repeated or cyclic loading. This often involves a relatively small load that subjects the metal to vibrations or cyclical stresses, leading to the initiation and growth of cracks over time. Eventually, this can result in catastrophic failure under conditions that seem manageable.
Step 3
Summarize the Differences
Answer
In summary, the key differences between metal fatigue and metal creep are based on the nature of stress and the conditions under which each occurs. Metal creep is a time-dependent deformation under constant load at high temperatures, while metal fatigue is the result of cyclic loading leading to failure, even at lower stress levels.