Engineering Studies- HSC Course

Topics: Tensile strength, Steel, Bicycle Pages: 16 (4317 words) Published: March 17, 2014
Engineering Studies – HSC Course

Assessment Task 2

Page 1…………………………………………………………………………….Title Page

Page 2…………………………………………………………………………….Material Properties

Page 3…………………………………………………………………………….Reynolds 853

Page 4…………………………………………………………………………….Reynolds X100

Page 5…………………………………………………………………………….Titanium alloy

Page 6…………………………………………………………………………….7005 Aluminium alloy

Page 7…………………………………………………………………………….Carbon Fibre

Page 8…………………………………………………………………………….4130 Chromium Molybdenum Steel

Page 9…………………………………………………………………………….Results

Page 10……………………………………………………………………………Table of Materials

Page 11……………………………………………………………………………Conclusion

Page 12……………………………………………………………………………Recommendation

Page 13……………………………………………………………………………Bibliography

Page 14…………………………………………………………………………… ” ”

Coen Moore yr 12 14/03/2014

A graph showing the strength and stiffness of the four different alloys, (www.genesisbikes.co.uk, 2012)

Reynolds 853
Reynolds is a combination of different elements with the alloy name steel (made up mostly of iron & carbon); the other elements present in this form of the alloy are manganese, chromium, molybdenum, silicon, and copper. Steel is possibly the strongest and most widely used alloy throughout the world (as graph on Pg 2 depicts), and its properties can be dramatically varied with slight changes to its chemical makeup. A significant factor that is used to increase the strength of ‘Reynolds 853’ is the process with which it is created.

There are many different ways that these steels are processed primarily for the fabrication of bike frames, in the case of 853, the method used is air hardening, and this is simply when the metal is left to harden. After the cooling period, the steel will then go through a series of heat treatment methods to further increase the ‘Reynolds 853’ strength. The steel can now withstand large loads. The properties of this steel allow thin walls to be used (hollow frame), making it much lighter (weight is a critical factor in bike builds). Even though this thin wall can be used, steel due to its high density remains heavy. Unlike most conventional steels, the weld sites of this steel actually have increased strength, simply from being air-cooled (which are usually first to fault).

The heat treatment that the steel undergoes is also responsible for a large increase in resilience, and it helps to slow the process of fatigue. With this done the yield strength of the entire tube, plus dent and impact resistance is dramatically increased. It leads to a thin tube frame, but it also has great fatigue resistance. We know steel is extremely resistant to fatigue and it can last for a lifetime, unfortunately it is also prone to corrosion.

Steel in general has a great resistance to bending because it is quite stiff due to its hard nature (mentioned in paragraph 1). Regrettably, due to steels exceptional stiffness, it is has very low shock abortion, making a steel frame rather uncomfortable to ride. When joining comes into consideration, steel would have to be one of the easiest to fabricate. There is an abundant amount of joining methods for steel, such as brazing or welding. Once welded it can still be modified to a large degree.

Overall, it is rather inexpensive, also has excessive tempering properties; it allows this immensely tough alloy to be affordable. Cost is low, high strength, easy to join and will last lengthy amounts of time. Sadly it is considerably heavy, corrodes easily and would be uncomfortable to ride (no shock absorption).

(http://en.wikipedia.org/wiki/Heat_treating)( http://en.wikipedia.org/wiki/Reynolds_Cycle_Technology)

(www.pelotonmagazine.com, 2013)
Reynolds X100
Reynolds X100 is an alloy made up of the elements Aluminium and Lithium (4.2% Li), this alloy is not as strong as steel (in some cases it contains copper, zirconium & magnesium)....


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