material

Topics: Tensile strength, Aluminium, Bicycle frame Pages: 5 (793 words) Published: March 12, 2015
HES1230 Materials and Processes
Materials and Processes Selection Assignment

Members:Lim Yu Rong ()
Buwanguzi Yusuf (4328752)
Cantona Chhoa Hua Fung (4317262)
Eric Ting Wei Xiang (4316614)

Date of Submission: 19th May 2014

Table of content
ContentPages
Sports and recreation equipment selection
Selection 1: Bicycle frame
Brief description
Properties required
Selected material: Carbon fibre
Introduction
Advantages and disadvantages compared to other materials
Sustainability issues
Processing technique
Selection 2: Baseball bat
Brief description
Properties required
Selected material: Aluminium
Introduction
Advantages and disadvantages compared to other materials
Sustainability issues
Processing technique

Sports and recreation equipment selection
Selection 1: Bicycle frame
Brief description
Bicycle frame is the core part of bicycle.
Properties required
1. Low density = light weight
2. High strength
3. High corrosion resistance
4. High toughness
5. High fatigue limit
6. Sustainable

Frame materials
Some of the materials that are used to make bicycle frames include Steel, Aluminium alloys, Titanium and Carbon fibre. Below is a brief description of Steel, Aluminium and Titanium in relation to bicycle frames. Thereafter is a more detailed study and comparison of each of the different properties of a bicycle frame under the candidate materials. This will provide the basis for choosing the best material for the job. Steel –Steel is the most commonly used material in bike frames. They are strong, easy to work, and relatively inexpensive, but denser and thus generally heavier than many other structural materials. Steel frames are often built using various types of steel alloys including chromoly. Chromoly is light, strong steel. When it is butted and shaped to take off excess weight, it can deliver a fairly light frame that will last through years of hard use. Chromoly is responsive and offers good flex while maintaining its form. Aluminium- Aluminium has a lower density and lower strength compared with steel alloys. They, however, possess a better strength-to-weight ratio, giving them notable weight advantages over steel. Aluminum's attractive strength to weight ratio as compared to steel, and certain mechanical properties, assure it a place among the favored frame-building materials. Titanium – Titanium combines many desirable characteristics, including a high strength to weight ratio and excellent corrosion resistance. Reasonable stiffness, roughly half that of steel, allows for many titanium frames to be constructed with "standard" tube sizes comparable to a traditional steel frame, although larger diameter tubing is becoming more common for more stiffness. Carbon Fibre – Carbon fiber composite is an increasingly popular non-metallic material commonly used for bicycle frames. Although expensive, it is light-weight, corrosion-resistant and strong, and can be formed into almost any shape desired. The result is a frame that can be fine-tuned for specific strength where it is needed to withstand pedaling forces, while allowing flexibility in other frame sections for comfort. In order for us to make the best selection of the material, the various properties have to fist be studied in detail and comparisons made between the four candidates. The properties include the weight, the strength, the corrosion resistance, the toughness, fatigue limit and the sustainability. All these are put into consideration during the process of material selection. After which, we shall base on our findings to select the best candidate for our bicycle frame. The strength:

The strength of a material is its ability to withstand an applied load without permanent distortion or failure. This is a very important aspect when selecting a material for a particular purpose, a bicycle frame in this case. The weight:

Corrosion resistance:...

References: Bicycle frame
http://www.rodbikes.com/articles/material-world.html
http://en.wikipedia.org/wiki/Bicycle_frame
http://bigshark.com/articles/which-frame-material-is-the-best-pg531.htm#.
https://www.missionbicycle.com/about/news/4-22-13/oversimplified-steel-vs-aluminum
Baseball bat
http://www.baseball-bats.net/baseball-bats/baseball-bat-materials/index.html
http://www.dixie.org/AssetFactory.aspx?did=608
http://m-5.eng.uml.edu/umlbrc/publications/Characterizing%20the%20Performance%20of%20Baseball%20Bats%20using%20Experimental%20and%20Finite%20Element%20Methods.pdf
http://www.slideshare.net/mustijab/composite-baseball-bat-manufacturing-process
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