1. Although you have not seen this type of table before, you should be able to work through the answers by reasoning. You have to select one of the materials (A, B or C) to be used as a casing material for a special laptop, which will be used outdoors in military or research applications. These materials have already been assessed as having the graded properties shown in Table 1 below. For this casing material, the importance of the properties (on a scale of 1 = low importance to 10 = high importance) are estimated as: High Elastic Modulus (9) High Corrosion Resistance (7) Low Price (5). The three candidate materials A, B, C were tested against the above properties, and they were given a rating of excellent (4), good (3), fair (2), poor (1). Table 1: Properties of Select Materials Property High Elastic Modulus High Corrosion Resistance Low Price Material A Good (3) Fair (2) Fair (2) Material B Fair (2) Good (3) Good (3) Material C Excellent (4) Poor (1) Fair (2) a) Using Table 1, which material would you choose for this particular application? Carry out a simple calculation to support this choice. b) Name three problems associated with this type of material selection procedure. c) Table 2 shows selected properties of different materials. Which material would be the most appropriate in the following cases: I. The strongest material 11. The lightest material III. The most structurally efficient material IV. The most cost efficient material (something that is structurally the most efficient with respect to cost).
1. Although you have not seen this type of table before, you should be able to work through the answers by reasoning. You have to select one of the materials (A, B or C) to be used as a casing material for a special laptop, which will be used outdoors in military or research applications. These materials have already been assessed as having the graded properties shown in Table 1 below. For this casing material, the importance of the properties (on a scale of 1 = low importance to 10 = high importance) are estimated as: High Elastic Modulus (9) High Corrosion Resistance (7) Low Price (5). The three candidate materials A, B, C were tested against the above properties, and they were given a rating of excellent (4), good (3), fair (2), poor (1). Table 1: Properties of Select Materials Property High Elastic Modulus High Corrosion Resistance Low Price Material A Good (3) Fair (2) Fair (2) Material B Fair (2) Good (3) Good (3) Material C Excellent (4) Poor (1) Fair (2) a) Using Table 1, which material would you choose for this particular application? Carry out a simple calculation to support this choice. b) Name three problems associated with this type of material selection procedure. c) Table 2 shows selected properties of different materials. Which material would be the most appropriate in the following cases: I. The strongest material 11. The lightest material III. The most structurally efficient material IV. The most cost efficient material (something that is structurally the most efficient with respect to cost).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Table 2: Selected Materials and their Properties
Material
Steel
Aluminium Alloy
Titanium Alloy
Magnesium Alloy
Cost
(£/kg)
1
5
50
10
Density
(kg/m³)
8000
3000
5000
2000
Yield Strength
(MPa)
400
600
800
200
HINT: The importance of the three properties (a) need to be combined with the ratings. You will
need to work out relationships for (c).
Transcribed Image Text:1. Although you have not seen this type of table before, you should be able to work through the
answers by reasoning.
You have to select one of the materials (A, B or C) to be used as a casing material for a special
laptop, which will be used outdoors in military or research applications. These materials have
already been assessed as having the graded properties shown in Table 1 below. For this casing
material, the importance of the properties (on a scale of 1 = low importance to 10 = high
importance) are estimated as:
High Elastic Modulus (9)
High Corrosion Resistance (7)
Low Price (5).
The three candidate materials A, B, C were tested against the above properties, and they were
given a rating of excellent (4), good (3), fair (2), poor (1).
Table 1: Properties of Select Materials
Property
High Elastic Modulus
High Corrosion Resistance
Low Price
III.
IV.
Material A
Good (3)
Fair (2)
Fair (2)
The strongest material
The lightest material
Material B
Fair (2)
Good (3)
Good (3)
a) Using Table 1, which material would you choose for this particular application? Carry out
a simple calculation to support this choice.
b) Name three problems associated with this type of material selection procedure.
c) Table 2 shows selected properties of different materials. Which material would be the
most appropriate in the following cases:
1.
II.
Material C
Excellent (4)
Poor (1)
Fair (2)
The most structurally efficient material
The most cost efficient material (something that is structurally the most efficient
with respect to cost).
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