Stress & Strain

Question 1

what is loading and what are the types of loading?

Answer 1

compression, tension, shear, torsion, bending

Question 2

what is stress and the formula?

Answer 2

the force applied to a material divided by the material’s cross-section area.
- stress = force / cross-sectional area
- σ = F / A0 (original cross-sectional area)

Question 3

what is stress, force and area measured in?

Answer 3

pascals, newtons, metres squared

Question 4

what do pascals also measure?

Answer 4

pressure

Question 5

what is strain and the formula?

Answer 5

the deformation or displacement of material that results from an applied stress
- strain = change in length / original length
- ε = L - L0 / L0

Question 6

what is the length measured in?

Answer 6

m

Question 7

strain is ______________ as it is a proportion or percentage

Answer 7

unitless

Question 8

strength vs toughness on a stress-strain graph

Answer 8

• highest stress a material can withstand (height of breaking point)
• amount of energy material absorbs before fracturing (area under lines)

Question 9

what is the model of elasticity, shear or bulk?

Question 10

what is the modulus of elasticity also known as?

Answer 10

Young’s Modulus