Stress-strain

Which of the following best describes the ability of a material to be stretched and return to its original shape?

• elasticity

• hardness

• conductor

• brittleness

In the given stress-strain curve, which of the following is represented by the slope of B?

• Fracture point

• Ultimate tensile strength

• Yield Strength

• Modulus of Elasticity / Hooke's law Proportionality Constant

"Normal force" for materials under load is a force that is parallel to the cross-sectional area.

• True

• False

If points D and E are close to each other in the stress-strain curve the material is ductile.

• True

• False

In the given stress-strain curve, which of the following is represented by point D?

• Fracture point

• Ultimate tensile strength

• Yield Strength

• Modulus of Elasticity / Hooke's law Proportionality Constant

In the given stress-strain curve, which of the following is represented by point A?

• Fracture point

• Ultimate tensile strength

• Yield Strength

• Modulus of Elasticity / Hooke's law Proportionality Constant

How is stress calculated?

• Number of sleepless nights divided by number of cups of coffee

• Divide load (F) by the original test sample cross-sectional area (A₀).

• Elongation (δ) under load divided by the original Length (L₀)

• Stress (σ) divided by strain (ε)

How is strain calculated?

• Number of sleepless nights divided by number of cups of coffee

• Divide load (F) by the original test sample cross-sectional area (A₀).

• Elongation (δ) under load divided by the original Length (L₀)

• Stress (σ) divided by strain (ε)

If a material has a cross-sectional area of 5 square meters and subjected to a normal force of 20 N, which of the following is the normal stress?

• 4 Pa

• 25 Pa

• 0.4 Pa

• 15 Pa

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

• ≈ 350 MPa

• ≈ 250 MPa

• ≈ 230 MPa

• ≈ 200 MPa