Biomechanics / Biomaterials Flashcards
Importance of bone
Load-bearing
Protection
Support
Ca/phosphorus homeostasis
Endocrine processes
Mechanics
Effects of forces acting on bodies or structures
Biomechanics
Application of mechanics in biological systems
Stress
Calculated quantity of internal interactions between adjacent constituent elements
The force applied - cannot be measured (measurable are loads/deformation)
Only a POINT (despite units of N/m2)
Strain
Measure of deformation of a material in response to stress
Proportional difference between loaded/unloaded state
Strain = change in length/length
Strength
Ultimate load a materials an withstand before catastrophic failure
Stiffness
Rate at which a material deforms when load is applied
Elastic deformation
Temporary shape change, self-revering
Yield point
Transition point between elastic and plastic deformation
Plastic deformation
Permanent distortion; original form cannot be regained without force
Failure point
Breaking point
Viscoelastic
Strength that depends on rate that loaded
I.e. stronger when loaded rapidly
Anisotropic
Mechanical properties dependent on direction of loading
I.e. stronger along long-axis
Toe region
Prior to elastic region
Toughness
Area under stress-strain curve