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CE Mat - Charpy

Total questions: 11

Worksheet time: 4mins

Name
Class
Date
1.

Typical structural steels (including A36 and A992) have a % carbon content of approximately ...

a)

0.025%

b)

0.25%

c)

2.5%

d)

25%

2.

In general, increasing the carbon content of a steel....

a)

Increases ductility

b)

Decreases strength

c)

Increases the modulus of elasticity

d)

Increases hardness

3.

Select the raw materials that are used to create pig iron.

a)

Iron Ore

b)

Pig Hooves

c)

Limestone

d)

Coke

e)

Air/Oxygen

4.

The purpose of the Charpy Impact test is to determine a metal's ...

a)

modulus of elasticity

b)

ultimate tensile strength

c)

toughness

d)

ultimate compression strength

5.

The Charpy Impact Test machine measures the ...

a)

the energy required to fracture a sample of metal

b)

the modulus of elasticity of the metal

c)

the exact carbon content of the metal

d)

the metals strain prior to fracture

e)

the stress in the metal prior to fracture

6.

In our Charpy lab, the metal specimens that we test will have varying ... (select all that apply)

a)

Chemical Compositions

b)

Heat Treatments

c)

Notch Sizes

d)

Temperatures

7.

By testing the toughness of the same metal at different temperatures, we can identify that metal's ...

a)

carbon content

b)

chemical composition

c)

heat treatment

d)

ductile to brittle transition point

8.

There are two ways to ID a metals ductile to brittle transition point. One way to identify the transition is to look at a graph of ...

a)

carbon content vs. fracture strength

b)

carbon content vs. fracture energy

c)

temperature vs. fracture strength

d)

temperature vs. fracture energy

9.

Fill In The Blank: The lab manual also asks you to use the second method of determining a metal's transition point, which is why you need to include pictures or sketches of the _______ in your lab report.

a)

Charpy testing machine

b)

fracture energy indicator

c)

metal's fracture surface

d)

notch in the metal

10.

The photo shows charpy samples with a ductile and a brittle fracture. What type of failure does a brittle metal exhibit?

a)

Unstable (Cleavage)

b)

Stable (Shear)

c)

Horizontal Buckling

d)

Surface Compression

11.

The Charpy sample in the picture shows primarily what type of fracture

a)

yielding

b)

ductile

c)

brittle

d)

stressing

e)

partial ductile and brittle