MOHAMMED ASSIGNMENT Essay Example

3Mohammed Assignment

MOHAMMED ASSIGNMENT

Question One

  1. Using Magnesium and Zinc as examples, recrystallization has the overall tendency of causing gradual changes in the characteristics of these metals with negligible variations in the microstructural stature of the metals. As a result, therefore, the specific effects are the contraction in length of zinc and magnesium with an increase in their ductility.

  2. In magnesium and zinc, cold-working will tend to cause expansion in their lengths with a corresponding reduction in their ductility and corrosion resistance. It is for this reason that such metals are usually heat treated after the cold working process.

  3. Alloying magnesium and zinc is known to help prevent the corrosion of these metals. This is made possible due to the protective oxide layer formed on the outside layers of zinc and magnesium when alloyed.

Question Two

  1. Using Acrylonitrile butadiene styrene (ABS) and nylon as examples, an increase in the polymer processing temperature makes them behave in a rubber-like nature or even melt, whereas a decrease in the temperature causes them to behave an a brittle manner.

  2. When higher mold temperatures are combined with lower mold temperatures, the performance of thermoplastic polymetric materials tend to be improved a great deal. In this case, the ABC and nylon will function well under these optimum mold temperatures.

  3. Just like the polymer processing temperature, injection speed causes ABC and nylon to become softer when speed is increased. When reduced, however, they tend to exhibit brittleness.

Question Three

  1. Using ABS and nylon, when higher mold temperatures are combined with lower mold temperatures, the performance of thermoplastic polymetric materials tend to be improved a great deal. In this case, the ABC and nylon will function well under these optimum mold temperatures.

  2. The moulding pressure and time affects ABS and nylon such that it causes ABC and nylon to become softer when speed is increased. When reduced, however, they tend to exhibit brittleness.

  3. The curing temperature and time affects ABS and nylon such that an increase in the polymer processing temperature makes them behave in a rubber-like nature or even melt, whereas a decrease in the temperature causes them to behave an a brittle manner.

Question Four

  1. Using glass and porcelain as examples of ceramic materials, an increase in the firing temperature is significant in improving their crystalline nature, and hence their overall performance.

Question Five

  1. Using concrete and wood as examples of composite materials, fibre alignment makes them to undergo depression of their stiffness and strength.

  2. De-lamination will cause abrasion on the composite materials – wood and concrete, in this case -, hence increasing their wear and tear tendencies.

  3. Due to their high resistance to stress, wood and concrete will experience an improved performance when the matrix ratio is applied. Ultimately, this improves their rigidity and greatly impedes crack propagation.

  4. Particle dispersion in cermet’s improves the toughness of wood and concrete, as well as composite materials in general.

Question Six

Using a piezoelectric and photoconductor as examples of smart materials, existence of electric fields will cause them to expand and generally increase in size by up to 4% of their original size. Colour change, on the other hand, has no significant impact in the way these materials behave or in their properties in service.

Question Seven

Materials that could be used for the blade of the wind turbine include glass and carbon fibre. Whereas carbon fibre is lighter and, therefore, lately preferred for this design, glass is seemingly cheaper in terms of costs involved, though comparatively heavier. In wind generation wind energy economic is essential. Even though glass in itself is cheaper than carbon fibre, the overall costs when used to design the blade are due to its weight. I would, therefore, prefer using carbon fibre because it requires less robust turbine and rotor components hence an overall lower cost of the whole wind turbine.

Question Eight

  1. Fibreglass is made by embedding small strands of glass in a mat before setting it in plastic. This combination makes fibreglass resilient, lightweight, and resistant to bending when used for the design of car bodies. Steel is the most prevalent material in the design of car bodies. It is equally strong, easy to bend, readily available, and affordable. Carbon fibre is also another material for car body design. It is known for its very high strength and very high production costs. Considering the market in the Middle East, I would select steel.

MOHAMMED ASSIGNMENT

MOHAMMED ASSIGNMENT 1

  1. The decision to settle on steel is informed by the fact the market in the Middle East is mostly synonymous with low-end cars such as Toyota. It would, therefore, be prudent to select an option whose cost is lower so that this cost reduction can be transferred to the end consumers.