Question-1 Give at least 3 examples of products where the use of materials has changed over time. Explain briefly. Question -2 What are some of the important properties of each of the engineering materials mentioned below? (a) Metals and alloys (b) Ceramics (c) Polymers (d) Composites (e) Electronic materials. Question -3 Using a sketch, define and briefly explain the following quantities: (a) Engineering stress (b) Engineering strain (c) Poisson's ratio

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
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Question-1
Give at least 3 examples of products where the use of materials has changed over time. Explain briefly.
Question -2
What are some of the important properties of each of the engineering materials mentioned below?
(a) Metals and alloys
(b) Ceramics
(c) Polymers
(d) Composites
(e) Electronic materials.
Question -3
Using a sketch, define and briefly explain the following quantities:
(a) Engineering stress
(b) Engineering strain
(c) Poisson's ratio
Question-4
What are the
Question-5
The following engineering stress-strain data were obtained from the tensile test for a 0.2% plain carbon steel.
(a) Plot the engineering stress-strain curve for these data.
(b) Determine the 0.2 percent offset yield stress for this steel.
(c) Determine the tensile elastic modulus of this steel.
(d) Determine the ultimate tensile strength of the alloy.
(e) Determine the percent elongation at fracture.
Engineering
stress (ksi)
0
30
55
60
68
thods of increasing the strength of metals? Explain briefly.
72
74
75
Engineering
strain (in./in.)
0
0.001
0.002
0.005
0.01
0.02
0.04
0.06
Engineering
stress (ksi)
1438485
76
75
73
69
65
56
Engineering
strain (in./in.)
0.08
0.10
0.12
0.14
0.16
0.18
(Fracture) 0.19
Question-6
A 20-cm-long rod with a diameter of 0.250 cm is loaded with a 5000 N weight. If the diameter decreases to
0.210 cm, determine (a) the engineering stress and strain at this load and (b) the true stress and strain at this
load.
Transcribed Image Text:Question-1 Give at least 3 examples of products where the use of materials has changed over time. Explain briefly. Question -2 What are some of the important properties of each of the engineering materials mentioned below? (a) Metals and alloys (b) Ceramics (c) Polymers (d) Composites (e) Electronic materials. Question -3 Using a sketch, define and briefly explain the following quantities: (a) Engineering stress (b) Engineering strain (c) Poisson's ratio Question-4 What are the Question-5 The following engineering stress-strain data were obtained from the tensile test for a 0.2% plain carbon steel. (a) Plot the engineering stress-strain curve for these data. (b) Determine the 0.2 percent offset yield stress for this steel. (c) Determine the tensile elastic modulus of this steel. (d) Determine the ultimate tensile strength of the alloy. (e) Determine the percent elongation at fracture. Engineering stress (ksi) 0 30 55 60 68 thods of increasing the strength of metals? Explain briefly. 72 74 75 Engineering strain (in./in.) 0 0.001 0.002 0.005 0.01 0.02 0.04 0.06 Engineering stress (ksi) 1438485 76 75 73 69 65 56 Engineering strain (in./in.) 0.08 0.10 0.12 0.14 0.16 0.18 (Fracture) 0.19 Question-6 A 20-cm-long rod with a diameter of 0.250 cm is loaded with a 5000 N weight. If the diameter decreases to 0.210 cm, determine (a) the engineering stress and strain at this load and (b) the true stress and strain at this load.
Expert Solution
Step 1

Question 1

1.   Automobiles - Earlier in the beginning of evolution of automobiles WoodSteel was widely used and after the first world war Cast Aluminium was introduced and was widely used until recent times. Today, the challenge is to find a lighter material than steel and Aluminium yet stronger. Nowadays Carbon Fiber Composites were used which proves 8-10 times stronger than Aluminium

2. Cutting Tools - Initially High seed steel (HSS) was used in the machining of iron. Later Cemented carbides were introduced which was much harder than HSS and then Ceramics Like Al2O3 , SiC was used.

3. Insulation Materials - Fibre glass, Plastic foams, Mineral Wool

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