Failureofmaterials

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Information about Failureofmaterials

Published on July 17, 2007

Author: luyenkimnet

Source: slideshare.net

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.

Conventional tensile failure mode that we are all familiar with.

Brittle Fracture

Ductile Fracture

Failure in Compression

Failure in Torsion

Failure in Bending

Stiff stuff getting bent!

Failure in little bits!

Sneaky failure

Fatigue Failure

Quietly in the hidden places failure

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

Will you ever fly in a plane again!

Bolting the door after the …..

Expensive can-opener!

A new slant on bird ingestion

Where did that runway go?

Brake failure or pilot error?

Pardon me sir!

This was frozen when I took off!

A watery grave

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

All unanticipated mechanical failures must have a cause:

Designed incorrectly

Manufactured incorrectly

Mis-maintained

Mis-operated

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!

  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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