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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

 

Brake caliper bolt failure

Click on pictures below for full size image.

   

This front brake assembly broke off under braking and severely injured the cyclist. Poor maintenance had allowed the brake bolt to loosen and allow the assembly to "chatter" when braking imposing cyclic loads instead of steady stress on the fastening bolt.

 

 As can be seen at higher magnification the failure was caused by bending fatigue in the steel brake mounting bolt which should be firmly secured through the cycle fork.

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Return to Bicycle components

 

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