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Fracture

Fracture. Recall……. Fracture process. Slow crack propagation Crack velocity~ 10ft/s Stable crack growth Slant face fracture Dull fracture surface Rough/fibrous surface Cup and cone fracture Necking occurs. Fast crack propagation Crack velocity~1000 ft/s Unstable crack growth

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Fracture

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  1. Fracture

  2. Recall…….

  3. Fracture process

  4. Slow crack propagation Crack velocity~ 10ft/s Stable crack growth Slant face fracture Dull fracture surface Rough/fibrous surface Cup and cone fracture Necking occurs Fast crack propagation Crack velocity~1000 ft/s Unstable crack growth Flat face fracture Shiny fracture surface Smooth fracture surface Chevron marks or radial lines TYPES OF FRACTUREMacroscopic Features Ductile Brittle

  5. CHEVRON MARKS/RADIAL LINES

  6. Void formation Dimpled fracture surface Transgranular River pattern Transgranular and intergranular Microscopic features

  7. DUCTILE BRITTLE

  8. Fatigue failure • Fatigue is failure under repeated/dynamic loads • Accounts for 95% of failure in moving parts • Generally initiates on the surface • Fracture surface shows macroscopic beach marks and microscopic striations

  9. Fatigue beach marks

  10. Fatigue striations

  11. A fracture surface

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