Please just do the Questions no 4, 5 and 6 only 1. A steel paper clip is made of
ID: 2088482 • Letter: P
Question
Please just do the Questions no 4, 5 and 6 only 1. A steel paper clip is made of wire that is 1 mm in diameter. The original material from which the wire was made was 10 mm in diameter. (Hint: the volume is constant) a) What longitudinal engineering strain has the wire undergone? b) What longitudinal true strain has the wire undergone? 2. Two solid cylindrical metal specimens have equal diameter, but different heights. They are each separately compressed to half of their original height. (Hint: the volume is constant) a) Show that the new diameters of the 2 compressed specimens are the same b) What is the ratio (new diameter)/(old diameter)? 3. A sample of material with a yield strength of 78MPa is prepared for a uniaxial tension test. The cylindrical sample is 25 mm in diameter. A force of 40,000N is applied. Does the part experience permanent plastic deformation? 4. What is the difference between a unit cell and a single crystal? 5. From your own experience, list three physical objects made using each of the following metals or their alloys a) iron b) aluminum c) copper d) titaniunm 6. Lead shot was once popular among sportsmen for hunting. These are the pellets in a shotgun shell. Environmentalists have expressed concerns about lead making its way into the food and water supplies, harming people and other animals. For examples, they have data that shows birds often ingest the pellets (as they do small stones) to help digest food, and that predators ingest the pellets when they consume wounded animals. What substitute material could you suggest as a replacement for the lead shot, and why?Explanation / Answer
answer 4.
answer 5.
Iron: iron is widely used in:
Aluminium: aluminium is low in weight and abunduntly present on earth's crust, aluminium is generally used for making
Copper: Copper is excellent conductor of elecricity and heat its alloys can be used in
Titanium: titanium is very high density metal and is added to base metal to increase its strength its alloys can be used in
answer 6:
Today, steel is one of the most popular, and least expensive, alternative to lead shot. Bismuth and tungsten alloys bear the closest resemblance to lead and also provides the killing power of lead, especially at long distances.