Quiz one lol

Question 1

A dislocation line shown by the black arrow head (cube with curved dislocation line) in a crystal shown. In which direction does the Burgers vector go?

Answer 1

There is only one Burgers vector for the dislocation line.

Question 2

Elastic deformation means that the sample:

Answer 2

Returns to the original dimensions after the load is removed.

Question 3

Hooke’s Law can be used to describe:

Answer 3

Elastic deformation.

Question 4

Yield strength is defined as:

Answer 4

the stress at 0.2% plastic deformation

Question 5

Ultimate tensile strength is defined as:

Answer 5

The maximum stress a sample could sustain

Question 6

Engineering stress is:

Answer 6

The load (force) divided by the initial cross sectional area.

Question 7

The modulus of elasticity (Youngs Modulus) is:

Answer 7

Can be determined by the initial linear portion of the engineering stress strain curve

Question 8

The hardness test can be used to estimate:

Answer 8

Yield strength?

Question 9

Coordination numbers of SC, BCC, FCC and HCP are:

Answer 9

6 8 12 12

Question 10

What is the relation of a to r in an FCC structure?

Answer 10

2 root 2 R

Question 11

What is the a to r relation in a BCC structure?

Answer 11

4/3 root3 r

Question 12

What is the relation of a to r in a HCP structure?

Answer 12

2R

Question 13

Anaelastic deformation means that:

Answer 13

The sample returns to its original dimensions some finite time after the load has been removed.

Question 14

Yield strength is defined as:

Answer 14

The stress at the point where plastic deformation is initiated.

Question 15

The (001) family in a tetragonal crystal system includes the following planes:

Answer 15

(001) only