AMIE Exam Lectures- Materials Science & Engineering | Mechanical Properties - Fatigue | 6.4

Engineering Subjects: Introduction to Material Science and Engineering:

Materials Science & Engineering | Mechanical Properties - Fatigue | 6.4

Introduction
Previous Lecture - Hardness
Present Lecture - Fatigue

Fatigue - Fatigue is the type of failure which occurs under fluctuating stress also called as dynamic fluctuating stress They must occur at lower stress.
* Stress strain curve
* It is one of the most common reason for failure of structural Material

Fatigue - Cycle Stress

Types of Fluctuating loads
* Reversed Stress Cycle
* Repeated Stress Cycle
* Random Stress Cycle

Fatigue SN Curve (Probability of failure - Statistical Treatment)

Fatigue Steps Involved
There are three steps involved in fatigue
* Crack Initiation
* Crack Propagation
* Failure

Crack initiation mainly at surface at regions of high stress concentration

Factors that affects Fatigue Failure
* Mean Stress
* Surface Effect

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