Biomechanics - Exam 3 - Tissue Mechanics
Low stress but a lot of deformation/strain
Blue line
Elastic material
Curve for what type of material?
Elastic region
Defined as the ability of a material to return to its non-deformed starting poit
Young's modulus of elasticity E= stress/strain
Defines stiffness
Yield point
Deformation happens after what part of the strain-stress curve?
High stiffness
Indicated by high Young's modulus
Low stiffness
Indicated by low Young's modulus
Elastic material
Material which goes back to its starting point when the stress stops but work is still lost because the work required to deform the material is not totally recaptured once the forces are removed
Fragility
Opposite of toughness; material absorbs little energy before it breaks; ability to deform with small amount of force
High stress and little deformation/strain
Orange line
Necking point
Point at which the degree of material damage is so extensive that the amount of deformation remains large with a decrease in stress
Brittleness
Refers to the ability of a materials to deform very little before failure
Plastic region
Region in which material is permanently deformed and as such that it will not turn to its original position when the stress is removed
Toe region
Region in which material is so slack so that a small amount of stress produces proportionally more strain
Plastic region
Region in which the material is damaged and the DEGREE OF DAMAGE INCREASES AS THE STRESS INCREASES. This results in the amount of strain/deformation increasing more relative to the increase in stress
Elastic of linear region
Region in which the material is tightening so that the AMOUNT OF STRESS IS PROPORTIONAL TO THE AMOUNT OF STRAIN.
Elastic or linear region
Region in which the release of stress would result in the material returning to its original point of not being deformed
R = (W-🔼W)/W
Resilience equation
Toughness
Resistance to mechanical failure; the amount of energy a material will absorb before breaking
Greater; less
The ___ the loss of work the less the resistance. The ___ the loss of work the greater the resistance.
Ductility
The ability of a material to deform progressively in tension without breaking; opposite of brittle
Strength
The magnitude of the force needed to break a material
Resilance
The mechanical work lost during deformation
Damping
The opposite of resilience; the ability of a material to restrain vibration
Failure
The point where the material completely breaks or ruptures
Load - deformation curve(stress-strain curve)
The relationship between the amount of stress/force and the amount of strain/deformation
Tendon
What tissue degenerates the least as we age?
Cartilage
What tissue degenerates the most as we age?
