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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

 

Bicycle hub failure

Click on pictures below for larger image.

bicycle hub

 This road bike hub caused the rear wheel to collapse as 4 spokes pulled out of the hub flange. It was a fatigue failure.

See below for two SEM (scanning electron microscope) images of the failure area.

 SEM image 1

 This SEM image taken close to the spoke holes indicates that the initial crack is fatigue based due to the presence of striations. Also shown is a secondary crack.

SEM image 2

 Another SEM image showing elsewhere there is ductile failure where the spokes finally pulled out of the reduced ligament of material.

Return to Metal fatigue cases
Return to Bicycle components

 

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