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Shaft should be string since it provides the facet for holding the umbrella. The ligaments or ribs connect to the shaft and help in maintaining the shape of the umbrella. HST Aluminum provides the best option for the shaft design because it is commercially available; it is light in weight, and a high strength-to-weight ratio.
The arms keep the umbrella in shape. Material selection using CES program indicate that aluminum is the best material for arm design. HST Aluminum is commercially available; it is light in weight, much harder, and a high strength-to-weight ratio.
The joint is made of plastic since plastic is easier to construct, saves money, and is readily available. Compared to other types of plastics, Polyvinyl Chloride (PVC) best suits umbrella joints. Low Density Polyethylene, Polypropylene, High Density Polyethylene, and Polyethylene Terephthalate are weak.
The cover material-Nylon (polyamide), provides the best choice for clothing material because it is: resilient to wear, difficult to link except mechanically, self-lubricating, creamy in color, resistant to extremely high temperatures, resistant to most chemicals, machines well, low friction coefficient, hard tough, bearing surfaces.
For the spring design, Ferritic steel is used because it is capable of maintaining its strength indeterminately, the surface is well sheltered from rust, recyclable and it is flexible and strong. Ferritic steels are also non-magnetic and contain less carbon (0.1%), 12-17% chromium, and other elements used in alloys; factors vital for the strength of the finished products.
The material selection above indicates that assembling an umbrella is a difficult engineering work. Several modern umbrellas have telescoping frames that enclose expansion springs. The frames are also attached to the second spring using a rider. The duties that each part carries out prove that the material selection phase needs proper analysis by CES. Mechanisms
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(“Materials selection using CES material program Coursework”, n.d.)
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(Materials Selection Using CES Material Program Coursework)
“Materials Selection Using CES Material Program Coursework”, n.d. https://studentshare.org/design-technology/1639063-materials-selection-using-ces-material-program.
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