Chapter 3

Question 1

Name the six tensile test sequences

Answer 1

No load
Uniform Elongation and area reduction
Maximum load
Necking
Fracture
Putting pieces back together to measure final length

Question 2

Engineering strain

Answer 2

Length - Orig Length / Orig Length

Question 3

What is the slope function for modulus of elasticity

Answer 3

Axial Stress = E*strain

Question 4

Strain Hardening

Answer 4

Metal becomes stronger as strain increases

Question 5

Relationship between true stress and true strain

Answer 5

Stress = (strength coefficient*e^(strain hardening coefficient)

Question 6

What test is used to measure metals and nonmetals with low to medium hardness

Answer 6

Brinell Hardness Test.

Where take a ball and press it into material at 500, 1500 or 3000 kg

Question 7

Explain the Di, Db, and F in the brinell hardness formula.

Answer 7

Inner and ball diameter. Indentation load.

2F/(pi*Db(Db-sqrt(Db^2 - Di^2)))

Question 8

Explain Rockwell Hardness Test

Answer 8

Cone shaped indentor pressed into material at 10 kg then 150 kg. Distance covered is calculated by machine.

Question 9

Explain temperature effect on strength and ductility

Answer 9

Strength decreases.

Ductility increases.

Question 10

Range hardness of Low C, High C, high alloy and Ceramics

Answer 10

Ceramics are the hardest. Then it is high alloy steel, high C and low C.