12.2.1. Mechanism of Fatigue Cracking

Try these first

1. 1.

   What is fatigue cracking?

   Hint

   Think about the meaning of 'fatigue' in everyday situations.

2. 2.

   Name one type of fatigue crack.

   Hint

   Think of a term related to an animal.

3. 3.

   What is the primary cause of fatigue cracking?

   • High temperatures
   • Material composition
   • Repeated loading

   Hint

   Consider the meaning of fatigue in a physical context.

4. 4.

   True or False: Fatigue cracking can occur even if individual loads do not exceed the material's ultimate strength.

   • True
   • False

   Hint

   Think about how the accumulation of smaller stresses can lead to failure.

5. 5.

   Given a scenario of a road with a high traffic volume and frequent temperature changes, predict the likely type of fatigue cracking that could occur and explain your reasoning.

   Hint

   Consider how repeated stress and environmental factors interplay.

6. 6.

   Analyze a failure report that mentions fatigue cracking in a pavement. What testing methods would you recommend to further assess the scenario?

   Hint

   Think about laboratory tests that simulate fatigue conditions.