4/19/2002, Wednesday Three Stages Fatigue Fracture

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4/19/2002, Wednesday Three Stages Fatigue Fracture Chapter 12, 13

Stage I Crack Nucleation

Development of Surface Roughness Ductile metal surface under cyclic loading

Stage II Micrfocrack Development

Fatigue Crack Growth in Ductile Metals Plastic blunting and re-sharpening in fully reversed fatigue

Fatigue Striations

Advancing Fatigue Crack

Stage III Catastrophic Failure

Fatigue-Crack Growth Rate

Stress Intensity Factor Range

Strong material are desired for high-cycle fatigue

At low DK value, fatigue striation are not evident