Titanium: New Technologies For Better Bicycles
The fourth most abundant metal and ninth of the 9 elements that account for over ninety nine percent of the mass of the earths crust, titanium is hardly unobtanium, despite its reputation. However , getting titanium out of the earth and turning it into bicycle parts takes a vast amount of energy. Part of titaniums legendary appeal lies in the proven fact that its strength-to-weight ratio surpasses any other metal, and it’s proof against corrosion.
Named for the Titans of Greek mythology, the tensile strength of some common titanium alloys approaches that of high-strength steels and far surpasses that of aluminum, without being brittle. Perhaps as significantly, titanium, like steel and in contrast to aluminium and magnesium, has a fatigue limit, implying that if the tensions are kept below that amount, it will never fail from fatigue. Its a high fatigue limit at that, thanks to its high tensile strength. The Youngs modulus ( rigidity index ) of titanium is around half that of steel, but so is its density. Titaniums density is high enough that tubes can’t be made as stiff for a similar weight as aluminum or magnesium ones, because heavier walls are required to prevent buckling with large diameter.
The anti corrosive properties of titanium are extraordinary. Nuclear submarines are made of it so they wont corrode in caustic sea environments, and unpainted titanium cycles and components simply dont rust. Titanium is not fragile either ; it can be stretched around twice as far as steel and four times as far as aluminium then was permanently misshapen. This gives titanium frames survivability in crashes, since they’ll be far more likely than others to spring back after impact. Finally, the ride of a titanium bike is normally smooth, because a frame designer can choose thin tube diameters and wall thicknesses to supply a supple ride without sacrificing longevity.
Due to titaniums ability to stretch and return to its original shape, drawing it into tubing demands larger and stronger machines than those required to draw steel tubing. Welding requires enclosure in an inert-gas atmosphere, and weld contamination must further be stopped through careful cleaning. Machining titanium requires very sharpened tools and express speeds and lubricants ; copper-laden lubricants are used on titanium threads, and it is not recommended to thread titanium parts into each other.
Titanium excels for cycle frame tubing and dropouts as well as for light-weight bolts, spindles and saddle rails.
To discover more about bicycle gear and get more cycling events, http://bikefitness.net /.
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