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Fatigue
Fatigue Fatigue is a process characterized by the gradual and irreversible decrease in the mechanical strength of a material under repeated loading. This rep...
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Fatigue Fatigue is a process characterized by the gradual and irreversible decrease in the mechanical strength of a material under repeated loading. This rep...
Fatigue is a process characterized by the gradual and irreversible decrease in the mechanical strength of a material under repeated loading. This repeated loading can be caused by various factors, including mechanical stress, thermal cycling, or corrosion. As a material undergoes fatigue, it develops a fatigue crack that grows in size until it eventually fails.
Examples:
Repeated bending of a metal beam can lead to fatigue failure.
Thermal cycling of a material can cause fatigue cracks to form and grow.
Exposure to high temperatures can cause fatigue in materials like alloys and plastics.
Causes of Fatigue:
Stress cycles: Repeated application of stress can cause the material to undergo plastic deformation and crack.
Stress concentrations: Stress concentrations, such as those caused by manufacturing defects or flaws, can initiate fatigue cracks.
Environmental factors: Environmental factors such as moisture, corrosive environments, and temperature can also contribute to fatigue.
Types of Fatigue:
Brittle fatigue: Brittle materials, such as metals and ceramics, undergo brittle fracture when subjected to fatigue.
Fatigue creep: This type of fatigue involves a gradual increase in stress with time, leading to gradual failure.
Fatigue cracking: Fatigue cracks initiate and propagate rapidly, leading to sudden failure.
Importance of Fatigue:
Fatigue is a significant factor in engineering and design, as it can cause components to fail prematurely, leading to accidents and safety issues. Fatigue analysis is used in various fields, including aerospace, automotive, and civil engineering, to ensure materials and components can withstand repeated loading and prevent failures