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Failure of Materials in Service

Failure of Materials in Service. What is Failure?. How is it defined?. Is this failure?. What about this?. Or this?. Familiar Failure. Conventional tensile failure mode that we are all familiar with. Brittle Fracture. Ductile Fracture. Failure in Compression. Failure in Torsion.

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Failure of Materials in Service

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  1. Failure of Materials in Service

  2. What is Failure? How is it defined?

  3. Is this failure?

  4. What about this?

  5. Or this?

  6. Familiar Failure • Conventional tensile failure mode that we are all familiar with.

  7. Brittle Fracture

  8. Ductile Fracture

  9. Failure in Compression

  10. Failure in Torsion

  11. Failure in Bending

  12. Stiff stuff getting bent!

  13. Failure in little bits!

  14. Sneaky failure

  15. Fatigue Failure

  16. Quietly in the hidden places failure

  17. You would not be worrying about this failure at the time it occurred!

  18. Will you ever fly in a plane again!

  19. Bolting the door after the …..

  20. Expensive can-opener!

  21. A new slant on bird ingestion

  22. Where did that runway go?

  23. Brake failure or pilot error?

  24. Pardon me sir!

  25. This was frozen when I took off!

  26. A watery grave

  27. Why Failure? All unanticipated mechanical failures must have a cause: • Designed incorrectly • Manufactured incorrectly • Mis-maintained • Mis-operated

  28. Typical modes of failure • tensile, compressive & shear •  bending (buckling) •  distortion, residual loads. •  creep (temperature / stress related) •  thermal shock •  corrosion (including stress corrosion) •  ageing •  wear, fretting • fatigue • And lastly, cracks in the fuselage!

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