Stress Strain

Question 1

Stress

Answer 1

Force per area pressure
Atmospheres, pascals, PSI
Tensor

Question 2

Strain

Answer 2

Deformation in response to stress
Ratio of objects dimensions

Question 3

Stiffness

Answer 3

Ratio of stress:strain in elastic region
Young’s modulus

Question 4

Young’s modulus

Answer 4

Slope
Stress/ strain

Question 5

Elasticity

Answer 5

Elastic region
Linear relationship

Deformation force
Equal in loading in unloading

Question 6

Hysteresis

Answer 6

Viscoelastic materials having different unloading response than its loading response. Measure energy lost for not perfectly least materials

Question 7

Hysteresis is associated with which variable

Answer 7

Elasticity

Question 8

Mechanical strength

Answer 8

Maximum force or energy material can absorb before failure

Question 9

Anisotropic

Answer 9

Varying strength depending on direction of loading

Question 10

Viscoelastic

Answer 10

Stress and strain in a material are dependent on the rate of loading

Question 11

Creep

Answer 11

Gradual elongation over time under constant tensile stress

Question 12

Stress relaxation

Answer 12

Decrease in stress over time in a fixed lengthening

Question 13

Hysteresis - creep

Answer 13

Loading and unloading response are not equal

Question 14

Bone loading - compression

Answer 14

Squeeze the molecules of a material together
200mPa

Question 15

Bone loading - tension

Answer 15

Stretch or pull apart material
125MPa

Question 16

Bone loading - shear

Answer 16

Right angle loading acting in opposite directions
65MPa

Question 17

Bone loading - torsion

Answer 17

Rotation and counter rotation

Question 18

Bone loading - bending

Answer 18

Compression and tension

Question 19

Wolffs law

Answer 19

Bone deposition and resorption are dependent on stresses
Weight bearing
Space travel
Metabolism