
E-Bike | BXB-75
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PROPERTIES OF METALS
Please understand that there is no simple statement that can be made that charac-terizes the use of
different metals for bicy¬cles. What is true is how the metal chosen is applied is much more important than
the material alone. One must look at the way the bike is designed, tested, manufactured, supported along
with the characteristics of the metal rather than seeking a simplistic answer.
Metals vary widely in their resistance to corrosion. Steel must be protected or rust will attack it. Aluminum
and Titanium quickly develop an oxide flm that protects the metal from further corrosion. Both are
therefore quite resistant to corrosion. Alu¬minum is not perfectly corrosion resistant, and particular care
must be used where it contacts other metals and galvanic corro¬sion can occur.
Metals are comparatively ductile. Ductile means bending, buckling and stretching before breaking.
Generally speaking, of the common bicycle frame building mate¬rials steel is the most ductile, titanium less
ductile, followed by aluminum.
Metals vary in density. Density is weight per unit of material. Steel weighs 7.8 grams/ cm3 (grams per cubic
centimeter), titanium 4.5 grams/cm3, aluminum 2.75 grams/cm3. Contrast these numbers with carbon
fber composite at 1.45 grams/cm3.
Metals are subject to fatigue. With enough cycles of use, at high enough loads, metals will eventually
develop cracks that lead to failure. It is very important that you read The basics of metal fatigue below.
Содержание BXB-75
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