Exam Question
(a) Define fatigue and fracture and specify the conditions under which it occurs.
(b) Describe the different fracture modes and the mechanism of crack propagation in different fracture modes
Class 2 (2nd Engineer)
MEKG
📅 Oct 2022
Reference Answer
### (a) Definitions and Conditions of Occurrence
#### **1. Fatigue**
**Definition:**
Fatigue is the progressive and localized structural damage that occurs in a material subjected to cyclic or fluctuating stresses. A critical characteristic of fatigue is that failure occurs at a stress level significantly below the material's Ultimate Tensile Strength (UTS) and often below its Yield Strength. The failure is typically sudden and catastrophic, resulting from the initiation and slow propagation of a crack until the remaining cross-section can no longer support the applied load.
#### **1. Fatigue**
**Definition:**
Fatigue is the progressive and localized structural damage that occurs in a material subjected to cyclic or fluctuating stresses. A critical characteristic of fatigue is that failure occurs at a stress level significantly below the material's Ultimate Tensile Strength (UTS) and often below its Yield Strength. The failure is typically sudden and catastrophic, resulting from the initiation and slow propagation of a crack until the remaining cross-section can no longer support the applied load.
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