Lecture 2- Properties Of Biomaterials

Question 1

Brittle

Answer 1

Very little plastic deformation

Fails early on

Question 2

Ductile

Answer 2

Lots of plastic deformation

Question 3

Resilience

Answer 3

Energy per unit volume to reach proportional limit

Question 4

Toughness

Answer 4

Energy per unit volume to reach failure

Question 5

Theology

Answer 5

Study of deformation and flow of materials

Question 6

Viscoelasticity

Answer 6

Time dependent response of materials to loading

Elastic- instantaneous deformation

Viscous- takes time

Question 7

Creep

Answer 7

Constant stress applied, change in strain

Question 8

Stress-Relaxation

Answer 8

Constant strain, stress goes down

Question 9

Hysteresis

Answer 9

Material follow different stress strain curve when stress is release

Indicates energy is lost

Increased hysteresis= increased viscosity

Question 10

Strain rate dependency

Answer 10

Viscous materials depend on rate that stress is applied

How quickly a material is deformed will determine how quickly a material deforms

Question 11

Fast Fracture

Answer 11

Failure occurs when stress exceeds ultimate strength

Question 12

Fatigue fracture

Answer 12

Failure occurs at applied cyclic stresses below ultimate strength

Causes material to weaken over time and eventually break due to cyclic loading