Material Selction Essay Example for Free

visible Selction EssayPark benchA common bench isnt just for parks. It is an essential factor of any public outdoor (or indoor) area. The 3 material I chosen ( wood concrete nerve) These park benches provide strength and durability with a strong steel skeleton and high quality UV and weather resistant thermoplastic coating. One of the most popular bench styles, the thermoplastic surface steel park bench comes in a range of styles and colors. The thermoplastic coating protects the steel for years to come, and is caution and corrosive free. Made for the widest range of applications, these benches can be portable as well and permanent installs. commercial-grade park benches made with wood are always a whirligig seller.Made usually of cedar, or pine, wood park benches offer strength and durability, reinforced with a welded metal frame construction for a great life. Wood is the popular choice in any case for its classic styling. When people think park bench, they depart mo re than likely visualize a wood slat park bench with back and fortification in an unfinished cedar nestled in a shady spot under an oak tree. This is obviously a great final result for a park, or outside of a mall exactly I would not recommend it for any city transit area.Other materials, like powder coated steel are better performers for high traffic. Concrete Park Benches are an inexpensive solution to a high traffic area. Dense and strong, anything concrete will last a long time and is grand for parks, schools, bus stops, corporate break areas and rest stops, and another(prenominal) various street scapes or public areas. It is also resistant to vandalism and thie truly due to its inherent density and bulk. It would be strenuous to attempt to touch off or damage one of these, making a concrete park bench the perfect solution for a permanent install.Hip jointThe human hip is a ball and socket joint. This means that the top of the leg bone, the femur, is rounded and fits into the socket of the hip. This joint may need to be replaced if it has worn away, broken, or become chronically painful in some way. The process involves replacing the hip joint with 3 artificial parts, cup, ball, stalkCup The cup is the most vital part of the hip joint process as the other 2 parts is dependable on the cup being good thus the material mustiness not only be tough and strong but resistant to corrosion, degradation, and give out-.I chose the material ultra-high density polythene for the cup division in because of its outstanding toughness cut and wear resistance and its excellent chemic resistance.Fermoral ball I chose the ceremaric material Zirconia for the head (ball) component in because of its Strength and Longevity, Zirconia is most indestructible ans should last a life ti. itcan be polished to give a very smooth surface and have a much lower wear rate than metal on polyethylene. Also using ceramics over metals for hip replacement parts are to do with the i nherent biocompatibility of ceramic materials. Being highly oxidised, they are very inert and so the risk of any reactions with the host is negligible. besides As with everything in life, all these benefits come with a price. Zirconia is very tough, which is good until you consider the peckish effect of the material against the other compnenets.Fermoral stem I chose the alloy material titanium for the stem component because not only does it have the combined properties of being light and strong it also allow for social movement of the artificial hip joint with a minimal amount of friction. In addition, titanium are long lasting, strong and resistant to corrosion, degradation, and wear. Therefore, they will retain their strength and shape for a long time. Resistance to wear is particularly significant in maintaining proper joint function and preventing the further destruction of bone caused by particulate debris generated as the implant parts move against each other. However tita nium is quite expensive.