Failureofmaterials

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Failureofmaterials

  1. 1. Failure of Materials in Service
  2. 2. What is Failure? How is it defined?
  3. 3. Is this failure?
  4. 4. What about this?
  5. 5. Or this?
  6. 6. Familiar Failure <ul><li>Conventional tensile failure mode that we are all familiar with. </li></ul>
  7. 7. Brittle Fracture
  8. 8. Ductile Fracture
  9. 9. Failure in Compression
  10. 10. Failure in Torsion
  11. 11. Failure in Bending
  12. 12. Stiff stuff getting bent!
  13. 13. Failure in little bits!
  14. 14. Sneaky failure
  15. 15. Fatigue Failure
  16. 16. Quietly in the hidden places failure
  17. 17. You would not be worrying about this failure at the time it occurred!
  18. 18. Will you ever fly in a plane again!
  19. 19. Bolting the door after the …..
  20. 20. Expensive can-opener!
  21. 21. A new slant on bird ingestion
  22. 22. Where did that runway go?
  23. 23. Brake failure or pilot error?
  24. 24. Pardon me sir!
  25. 25. This was frozen when I took off!
  26. 26. A watery grave
  27. 27. Why Failure? <ul><li>All unanticipated mechanical failures must have a cause: </li></ul><ul><li>Designed incorrectly </li></ul><ul><li>Manufactured incorrectly </li></ul><ul><li>Mis-maintained </li></ul><ul><li>Mis-operated </li></ul>
  28. 28. Typical modes of failure <ul><li>  tensile, compressive & shear </li></ul><ul><li>  bending (buckling) </li></ul><ul><li>  distortion, residual loads. </li></ul><ul><li>  creep (temperature / stress related) </li></ul><ul><li>  thermal shock </li></ul><ul><li>  corrosion (including stress corrosion) </li></ul><ul><li>  ageing </li></ul><ul><li>  wear, fretting </li></ul><ul><li>fatigue </li></ul><ul><li>And lastly, cracks in the fuselage! </li></ul>

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