Fatigue Failure Theories Video Lecture | Strength of Materials (SOM) - Mechanical Engineering

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FAQs on Fatigue Failure Theories Video Lecture - Strength of Materials (SOM) - Mechanical Engineering

1. What is fatigue failure?
Ans. Fatigue failure refers to the failure of a material due to repeated or cyclic loading. It occurs when a material is subjected to fluctuating stresses over a prolonged period, leading to cracks and fractures.
2. What are the common causes of fatigue failure?
Ans. The common causes of fatigue failure include cyclic loading, fluctuating stress levels, improper design or material selection, surface defects or discontinuities, and inadequate surface finishes.
3. How can fatigue failure be prevented?
Ans. Fatigue failure can be prevented by employing various techniques such as designing for infinite life, reducing stress concentrations, improving material quality and selection, applying surface treatments, conducting proper inspections and maintenance, and avoiding excessive loading or vibrations.
4. What are the different fatigue failure theories?
Ans. There are several fatigue failure theories, including the Stress-Life (S-N) approach, the Strain-Life (ε-N) approach, the Linear-Elastic Fracture Mechanics (LEFM) approach, and the Critical Plane approach. These theories provide different perspectives on analyzing and predicting fatigue failure based on stress, strain, and crack propagation behaviors.
5. How is fatigue failure analyzed in engineering?
Ans. Fatigue failure is analyzed in engineering by performing fatigue tests on materials or components under various loading conditions and stress levels. These tests help determine the fatigue life, stress-life curves, and fatigue strength of the material. Additionally, sophisticated computational techniques, such as finite element analysis, are used to simulate and predict the behavior of materials under cyclic loading.
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