se a loss coefficient-Youmg\'s modulus chart at Level 2 to find metals with the
ID: 1868054 • Letter: S
Question
se a loss coefficient-Youmg's modulus chart at Level 2 to find metals with the highest possible damping Answer Use a Thermal conductivity Electrical resistivity ( ?-pe ) chart at Level 2 to find three materials with high thermal conductivity,, and high electrical resistivity, pe Answer. 32 Make a E-p chart at Level 2. Apply a selection line of slope 1. corresponding to the index E /p positioning the line such that six materials are left above it. Which are they and what families do they belong to? Answer. 34. Use a E-p chart to establish whether woods have a higher specific stiffness E/p than epoxies. Answer. 35. Use a E-p chart to identify metals with both E > 100 GPa and specific stiffness Elp> 0.02 GPa/(kg/m3) You can use multiple selection lines for this. Answer. 36. The speed of longitudinal waves in a material is proportional to E /p. Use a E-p chart and display lines to read off approximate values for any material. Which metals have about the same sound velocity as steel? Does sound move faster in titanium or glass? Answer. 37. Use a E-p chart to identify materials with both E 100 GPa and E13 1p> 0.003 (GPa)1/3/(kg/m3). Note that on taking logs, the performance index M-E3/p becomes Log (E) - 3 Log (P)+3 Log (M). Make this plots as a line of slope 3 on the chart, passing through the point E-27GPa when ?- 1000 kg/m3 in the units on the chart. For what applications is this index used? AnswerExplanation / Answer
(41)The material index is a measure often considered by an industrial enterprise when deciding where to locate. This index represents the ratio of the weight of local materials used in the manufacture of a product to the weight of the manufactured product in its final form. When the material index is greater than 1, it indicates that the raw materials lose a part of their weight during the manufacturing process. If the material index is less than 1, it indicates that weight is gained during the process so the final weight of the finished product is greater than that of the local raw materials used. This is significant in determining the cost of transporting raw materials in relation to the costs of delivering the finished product.
(42)The best thermal insulators have the lowest thermal conductivity; this is the property of a material that measures how well it can conduct heat through its mass. The lower the conductivity measure, the less well a material is able to conduct heat, thus enabling it to trap heat or protect contents from outside heat.
(43)Density;Density measures the ‘heaviness’ of an object or how closely ‘packed’ the substance is. Density is related to both the type of material that an object is made of and how closely packed the material is.
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