Engineering the Future
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COMPONENT FAILURE MUSEUM

The main sections of the museum are listed below;

Metal Fatigue
Manufacturing Faults
Bicycle Components
Corrosion
Polymers
Composite Materials

Tools of the trade, some ways to investigate problems;
Photoelasticity
Dye penetrant testing

Glossary
of materials engineering terms

 

Pedal crank failure

Click on pictures below for full size image.

 

This pair of cranks have seen considerable service and have suffered severe pitting and local damage. However this did not end their life. A fatigue crack caused one crank to fail and unseat the rider.

 

A close up showing the fracture surface shows a blackened slow growing crack that finally triggered a fast fracture. The manufacturers considered this to be an acceptable product life span and offered no recompense.

Return to Metal fatigue cases
Return to Bicycle components

Ed:AGr

 
 
© 2005 Materials Engineering - Page last modified 18-Dec-2007