MESPD-Solution-manual - bud21932_ch02_027-066 07/28/2006...

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Materials: engineering, science, properties, and design Solution manual Chapter 1 E 1.1 . Use Google to research the history and uses of one of the following materials s Tin s Glass s Cement s Titanium s Carbon fiber Present the result as a short report of about 100 - 200 words (roughly half a page). Specimen answer: tin. Tin (symbol Sn), a silver-white metal, has a long history. It was traded in the civilisations of the Mediterranean as early as 1500 BC (the Old Testament of the Christian bible contains many references to it). Its importance at that time lay in its ability to harden copper to give bronze (copper containing about 10% tin), the key material for weapons, tools and statuary of the Bronze age (1500 BC – 500 BC). Today tin is still used to make bronze, for solders and as a corrosion resistant coating on steel sheet (“tin plate” ) for food and drink containers – a “tinnie”, to an Australian, is a can of beer. Plate glass is made by floating molten glass on a bed of liquid tin (the Pilkington process). Thin deposits of tin compounds on glass give transparent, electrically conducting coatings used for frost-free windshields and for panel lighting. E 1.2. What is meant by the design-limiting properties of a material in a given application? Answer. A design limiting property in a given application is one that limits the performance of the application. To meet a required level of performance, the design-limiting properties must meet or exceed target values. E1.3. There have been many attempts to manufacture and market plastic bicycles. All have been too flexible. Which design-limiting property is insufficiently large? Answer. Flexibility is lack of stiffness. The stiffness of a structure depends on its shape and size, and on the value of Young’s modulus E of the material of which it is made. In design for stiffness E is a design-limiting property. In bicycle design the values of E offered by plastics are insufficiently large. However if the plastic is reinforced with carbon or glass fiber the stiffness can be increased to a useful level – high performance bicycles are made of carbon-reinforced plastic. E 1.4. What, in your judgment, are the design-limiting properties for the material for the blade of a knife that will be used to gut fish? Answer. Hardness (to give a wear resistant, sharp edge); ability to be shaped to a blade; resistance to corrosion in fresh and salt water; stiffness (meaning modulus) to ensure that the thin blade does not bend or buckle during use. E 1.5. What, in your judgment, are the design-limiting properties for the material of an oven glove? Answer. Flexibility (to allow weaving or shaping, and motion in use); low thermal conductivity (to insulate); maximum operating temperature > 200C (high oven setting); and ability to be washed, meaning tolerance of water.
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MESPD-Solution-manual - bud21932_ch02_027-066 07/28/2006...

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