1. Define strain: 2. Define Axial strain: 3. Steel is not highly elastic? True o
ID: 1863148 • Letter: 1
Question
1. Define strain:
2. Define Axial strain:
3. Steel is not highly elastic? True or False
4. What is the difference between long columns and short columns?
5. What does it mean by Tangent Modulus? When does the tangent modulus get used?
6. Effective slenderness ratio is the factor, which determines whether a column is a short column or a long column? True or False
7. What are four controlling factors in the heat treatment process?
8. What is the purpose of Hardening Heat Treatment?
9. There are several ways quenching can be done. Which on of these are the most rapid cooling medium?
10. Whats the purpose of surface hardening?
11. Explain what Tempering does in the quenching process:
12. List and explain some of the physical properties of plain carbon steel:
13. What do the three Ts represent in the TTT diagram?
14. What are the three most common methods of hardening the surface of a metal? Explain each of them in detail:
15. What are some characteristics of Titanium/
16. Spheroidizing of steel is done to?
17. Which of the following is the most toxic to people?
(a) Aluminum
(b) Titanium
(c) Magnesium
(d) Beryllium
18. What are some significant characteristics that composites have that other materials dont have?
19. What are two categories of fiber reinforced composites?
20. What is a single layer of fiber-reinforced composite called?
21. List the common defects that have to be controlled in composite materials?
22. Why do aircraft firefighters have to pay specific attention to what the aircraft is made of when going to fight a aircraft fire?
23. Carbon fibers are electrically conductive? True or False
24. If a material is in the elastic range then why is the value of the stress concentration factors constant?
25. Brittle materials are called notch-sensitive? True or False
Explanation / Answer
Answer :
1. Define strain:
Answer :Strain is defined as the amount of deformation an object experiences compared to its original size and shape. For example, if a block 10 cm on a side is deformed so that it becomes 9 cm long, the strain is (10-9)/10 or 0.1 (sometimes expressed in percent, in this case 10 percent.) Note that strain is dimensionless.
2. Define Axial strain:
Answer :Axial strain occurs in the direction that the load is applied, or on the same axis as the applied load. Say if you were pulling on a rope, axial strain occurs on the axis on which you are pulling the rope (x, y, z).
3. Steel is not highly elastic? True or False
Answer : True
4. What is the difference between long columns and short columns?
Answer :
short columns: A column is considered to be short when the ratio of its effective length to its least lateral dimension does not exceed12.
long columns : If the ratio of the the effective length to its least lateral dimension exceeds12 the column is considered to be a long column.
5. What does it mean by Tangent Modulus? When does the tangent modulus get used?
Answer : The tangent modulus is the slope of the compression stress-strain curve at any specified stress or strain. Below the proportional limit the tangent modulus is equivalent to Young's modulus. Above the proportional limit the tangent modulus varies with strain and is most accurately found from test data.
2 - The tangent modulus is useful in describing the behavior of materials that have been stressed beyond the elastic region. When a material is plastically deformed there is no longer a linear relationship between stress and strain as there is for elastic deformations. The tangent modulus quantifies the "softening" of material that generally occurs when it begins to yield.
6. Effective slenderness ratio is the factor, which determines whether a column is a short column or a long column? True or False
Answer : True
7. What are four controlling factors in the heat treatment process?
Answer : 1- Annealing
2 - Hardening.
3 - Normalizing
4 - Tempering
8. What is the purpose of Hardening Heat Treatment?
Answer :
HARDENING AND TEMPERING
Heat treatment of steel in a school workshop is normally a two stage process. For example, if a high carbon steel or silver steel screw driver blade has been manufactured, at some point it will have to be
HARDENING AND TEMPERING
Heat treatment of steel in a school workshop is normally a two stage process. For example, if a high carbon steel or silver steel screw driver blade has been manufactured, at some point it will have to be
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