AC LEC 20-09

AC LEC 20-09 - Lecture 20- Fracture of Materials Fracture...

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Lecture 20- Fracture of Materials Fracture ductile brittle fatigue Fracture Mechanics stress intensity fracture toughness RMS Titanic sank on April 12, 1912 Water Temperature: -2º C DBTT of Steel Used: 56º C to 32º C
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Failure: The inability of a component to perform its intended function Fracture: Separation of a solid under stress Only some failures involve fracture Two general categories: Ductile Fracture Brittle Fracture Failure and Fracture NOTE: SUBJECTIVE!!!
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Ductile Fracture: Slow crack growth Significant plastic deformation Ductile and Brittle Fracture Brittle Fracture: Fast crack growth Minimal plastic deformation
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Progress of Ductile Fracture 1. Necking 2. Internal Voids 3. Void Coalescence 4. Crack growth 5. Shear Lip formation 6. Final fracture
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Dimples Note: Second phase particles in dimples
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Brittle Fracture Intergranular Cleavage 1. Dislocation Pileup 2. Shear Stress Buildup 3. Microcrack Nucleation 4. Crack Propagation
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Transgranular Cleavage Note: “through grain”
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Cleavage Fracture Sharp Corner Note: Chevron Pattern points back to origin
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Intergranular Fracture Note: Sintering Void in Ceramics
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AC LEC 20-09 - Lecture 20- Fracture of Materials Fracture...

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