Physics of DM

Question 1

mechanical forces may cause DM to

Answer 1

stretch, compress, deform, fracture [failure]

Question 2

compressive strength

Answer 2

resitance to breaking from a force acting to reduce its size

Question 3

tensile strength

Answer 3

resistance to breaking from a force acting to elongate

Question 4

shear strength

Answer 4

resistance of a material to moving along an axis which is parallel to the forces direction

Question 5

strain

Answer 5

change in length / original length
change in dimension after force applied

Question 6

YM =

Answer 6

stress / strain
in MPa

Question 7

biting force strength

Answer 7

500-700N

Question 8

material failure mechanisms

Answer 8

facture, hardness, abrasion, abrasion resistance, fatigue, creep, deformation, de-bond, impact

Question 9

fracture

Answer 9

large forces cause catastrophic destruction of materials structure

Question 10

hardness

Answer 10

inability of surface to resist indentation

Question 11

abrasion

Answer 11

material surface remval due to grinding

Question 12

abrasion resistance

Answer 12

ability to withstand surface layers being removed, so compromising surface integrity

Question 13

fatigue

Answer 13

repeated small stresses cause material fracture

Question 14

creep

Answer 14

gradual dimensional change due to repetitive small forces

Question 15

deformation

Answer 15

applied stress causes permanent change in materials dimension, not fractured

Question 16

de-bond

Answer 16

applied forces sufficient to break material-tooth bond

Question 17

impact

Answer 17

large, sudden force causes fracture