Fatigue of Material Part I - Science Initiative Group 9 - Fatigue of Materials.pdf · Fatigue of Materials • Fatigue is the process by which most ... The dependence of fatigue life,

Fatigue of Material

Part I

Lecture 6

Fatigue of Materials

Fatigue of

Material

Fatigue Mechanisms

Characterization of Fatigue

Characterization of Fatigue

The Driving Force for Fatigue

The Factors that Affect Fatigue Life

Measurement of Stress-Life Behavior

The Stages of Fatigue Damage in Materials

The Fracture Mechanics Approach to Fatigue

The Fracture Mechanics Approach to Fatigue

∆K = Kmax – Kmin ∆K = Y ∆σ√(πa) = Y(σmax – σmin)√(πa)

Relationships Between Crack Growth

Rates and Crack Driving Forces

Relationships Between

Crack Growth Rates and

Crack Driving Forces

Life Prediction within a Fracture

Mechanics Framework

Propagation of Failure

Propagation of Failure

Mechanisms of Fatigue Crack Grwoth

Mechanisms of Fatigue Crack GrowthIn Regimes ABC

Crack Growth From

Posteromedial Corner

Fatigue Striations on

Surface of Lateral Crack