- Chemical Engineering Basics - Section 1
- Chemical Engineering Basics - Section 2
- Chemical Engineering Basics - Section 3
- Chemical Engineering Basics - Section 4
- Chemical Engineering Basics - Section 5
- Chemical Engineering Basics - Section 6
- Chemical Engineering Basics - Section 7
- Chemical Engineering Basics - Section 8
- Chemical Engineering Basics - Section 9
- Chemical Engineering Basics - Section 10
- Chemical Engineering Basics - Section 11
- Chemical Engineering Basics - Section 12
- Chemical Engineering Basics - Section 13
- Chemical Engineering Basics - Section 14
- Chemical Engineering Basics - Section 15
- Chemical Engineering Basics - Section 16
- Chemical Engineering Basics - Section 17
- Chemical Engineering Basics - Section 18
- Chemical Engineering Basics - Section 19
- Chemical Engineering Basics - Section 20
- Chemical Engineering Basics - Section 21
- Chemical Engineering Basics - Section 22
- Chemical Engineering Basics - Section 23
- Chemical Engineering Basics - Section 24
- Chemical Engineering Basics - Section 25
- Chemical Engineering Basics - Section 26
- Chemical Engineering Basics - Section 27
- Chemical Engineering Basics - Section 28


Chemical Engineering Basics - Engineering
Q1: Which of the following is not a characteristic observed in material failure by fatigue fracture ?A Plastic deformation of material does not occur.
B Initiation of crack from below the surface does not occur.
C Initation of crack occurs on the surface of the machine part.
D Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface.
ANS:B - Initiation of crack from below the surface does not occur. "Initiation of crack from below the surface does not occur" is incorrect in the context of fatigue failure. In fatigue failure, cracks often initiate from below the surface of the material due to cyclic loading. This is one of the key characteristics of fatigue failure. The repetitive application of stress, even if it's below the yield strength of the material, can lead to the accumulation of microscopic defects, which eventually coalesce into cracks below the surface. These cracks then propagate gradually until catastrophic failure occurs. Therefore, the correct statement regarding the initiation of cracks in fatigue failure is: "Initiation of crack occurs below the surface of the material." |


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