Failure of Materials in Service What is Failure? How is it defined?
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Transcript of Failure of Materials in Service What is Failure? How is it defined?
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Failure of Materials in Service
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What is Failure?
How is it defined?
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Is this failure?
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What about this?
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Or this?
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Familiar Failure
• Conventional tensile failure mode that we are all familiar with.
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Brittle Fracture
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Ductile Fracture
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Failure in Compression
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Failure in Torsion
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Failure in Bending
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Stiff stuff getting bent!
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Failure in little bits!
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Sneaky failure
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Fatigue Failure
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Quietly in the hidden places failure
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You would not be worrying about this failure at the
time it occurred!
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Will you ever fly in a plane again!
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Bolting the door after the …..
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Expensive can-opener!
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A new slant on bird ingestion
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Where did that runway go?
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Brake failure or pilot error?
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Pardon me sir!
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This was frozen when I took off!
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A watery grave
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Why Failure?
All unanticipated mechanical failures must have a cause:
• Designed incorrectly• Manufactured incorrectly• Mis-maintained• Mis-operated
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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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