Engineering the Future
MATERIALS ENGINEERING  
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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 Components - Cycle rim problems

This polished aluminium rim was left over Christmas with road salt and mud on the rim. Galvanic corrosion has started between the chromium plated brass spoke nipple and the aluminium rim.
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This extruded section cycle rim contains an extrusion defect that created a plane of weakness. When the wheel was being rebuilt with new spokes the increased tension ruptured the rim.
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This galvanic corrosion can be even worse underneath the tyre in cycles used all winter. Here the corrosion is so advanced it has penetrated the rim thickness.
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© 2005 Materials Engineering - Page last modified 18-Dec-2007