Stress/Strain Review

​(Ϭ - Sigma)

Multiple Choice

Stress is defined as:

• force per unit of area

• force per unit of length

• force per unit of math

• force per unit of time

Multiple Select

The cross-sectional area is measured in: (Choose ALL of the correct answers!!)

• in²

• ft²

• m²

• lbs²

Multiple Choice

What does the symbol, Ϭ , stand for?

• axial force

• total deformation

• stress

• the difference over time

Open Ended

PSI is an acronym for what unit?

Fill in the Blank

An aluminum sample with an area of 2.0 in² has been tensile tested. Calculate the engineering stress for an applied load of 8000 lbs.

Multiple Choice

Which is the symbol for the Greek letter "delta"?

• ^Δ

• Ψ

• ^Ω

• Θ

Multiple Choice

Which symbol represents the "length"?

• A

• E

• R

• L

Multiple Choice

What does the symbol, Δ, stand for?

• axial force

• total deformation

• stress

• the change in

Multiple Choice

This is the formula for....

• stress

• strain

• elongation

• axial force

Multiple Choice

What does the symbol, δ , stand for?

• axial force

• total deformation or elongation

• strain

• the change in

Fill in the Blank

If my dog bone starts at 165 mm and fractures at 175 mm what is my δ?

Fill in the Blank

If my dog bone starts at 165 mm and fractures at 175 mm what is my ε?

​Plastic Region

Multiple Choice

Which symbol represents the "Modulus of Elasticity"?

• A

• E

• ε

• L

Multiple Choice

What property best describes the ability to be stretched and return to original shape:

• elasticity

• conductor

• hardness

• brittleness

Multiple Choice

The Modulus of Elasticity (E) is measured in:

• inches

• feet

• N/m² or psi or lb/ft²

• lbs

Stress/Strain Curve

●Ultimate Tensile Strength is the
maximum stress of the material

●Yield Strength is the point at
which a material is no longer in
elastic deformation aka it will not
return to it’s prior size

Multiple Choice

Stress-strain diagram has five stages in the material; select the correct sequence of the stages:

• Elastic region - Yielding - Strain hardening - Necking - Fracture

• Elastic region - Strain hardening - Yielding - Necking - Fracture

• Elastic region - Yielding - Necking - Strain hardening - Fracture

• Yielding - Elastic region - Necking - Strain hardening - Fracture

Fill in the Blank

Using the stress-strain curve above, what is the yield strength for aluminum?

Fill in the Blank

Using the stress-strain curve above, what is the tensile strength for steel?

Multiple Choice

What does point A, B, D, E represent, respectively?

• A: Yield Strength, B: Modulus of Elasticity, D: Tensile Strength, E: Strength at Failure

• A: Modulus of Elasticity, B: Yield Strength, D: Tensile Strength, E: Strength at Failure

• A: Modulus of Elasticity, B: Yield Strength , D: Tensile Strength, E: Strength at Failure

• A: Yield Strength, B: Modulus of Elasticity, D: Strength at Failure, E: Tensile Strength

Material
Properties
in relation
to curve

●Ductile materials will have a
similar ultimate/yield
strength in tensile and
compression tests.

Multiple Choice

Using the stress-strain curves provided, which of the two materials experiences more plastic deformation?

• Material #1

• Material #2

Multiple Choice

Using the stress-strain curves provided above, which of the two materials shown is more brittle?

• Material #1

• Material #2

Fill in the Blank

This image is an example of a …........... material

Fill in the Blank

This image is an example of a …........... material

Multiple Choice

Unrecoverable elongation beyond the elastic limit.

• Resilience

• Elastic Deformation

• Elastic Limit

• Plastic Deformation

Multiple Choice

Ductile materials are defined as:

• materials that can be subjected to large strains before it fractures

• materials that exhibit little or no yielding before failure

• materials that cannot be subjected to large strains

• materials that are elastic