Stress and strain

Question 1

Name the stages in the stress strain diagram

Answer 1

A = Proportional Limit

B = Elastic Limit

C = Upper Yield Point

D = Lower Yield

E = Ultimate Tensile Strength

F = Fracture / Braking Point

Question 2

Name the regions of a stress strain diagram

Answer 2

Question 3

What property of a material is measured by the area under the stress-strain curve

Answer 3

Toughness

Question 4

A mild steel test piece for a civil structure was made to 1/4 scale, and tested in tension to destruction. The force required to destroy the test piece is 200 kN.

At what minimum force would you expect the full-size component to fail?

Answer 4

≈ 3200kN

The graph is not linear, instead exponential and thus does not increase linearly.

Question 5

What is the region under the elastic limit defined?

Answer 5

The Resilience.

The ability for a material to absorb energy upto the elastic point

Question 6

What is the region under the stress strain graph called?

Answer 6

Toughness

Question 7

What occours to the material after the ultimate tensile strength.

Answer 7

Necking

Question 8

What is the formula for stress?

Answer 8

Stress = F/A

Where: F = Force applied, and A = Cross sectional area

Question 9

What is the formula for strain