Stress and Strain

Question 1

What is Strain?

Answer 1

Measure of deformation representing the displacement between particles in the body relative to a reference length

Question 2

Elasticity

Answer 2

Property of a material that returns to its original shape after stress is removed.

Question 3

Plasticity

Answer 3

Property of a material to undergo a non-reversible change of shape in response to an applied force

Question 4

At what point does a material lose its elasticity?

Answer 4

Material is perfectly elastic until it undergoes brittle fracture when applied stress reaches a1

Question 5

When does a material undergo plastic deformation?

Answer 5

Material undergoes plastic deformation when stress exceeds yield stress a0

Question 6

When does permanent strain occur?

Answer 6

Permanent strain results from plastic deformation when stress is raised to a0 and released