fundementals of materials Flashcards
(22 cards)
force
one body interacting with another through actual contact or from a distance (gravity)
how much is occlusal force
200-3500N
when does force increase
as you approach the hinge access
patients with removable/partial dentures have more or less occlusal force
less
stress
when a body resistance of force is equal in magnitude…= force/area and is explained in pascals
what are the types of stress
axial. tension = elongation
axial-compression = compression
shear = shearing (parallel in opp direction)
twisting = torsion
bending = flexure
math equation for stain (deformation in length)
deformation/original length
a stress/strain curve has a slope of
Force/area stain=x stress=y
what is the point when a curve on a stress/strain curve becomes non-linear
proportional limit
elastic limit is the max stress that a material will
withstand permanent deformation
yield strength
is a better judge of proportional limit
is the amount of stress that must be applied to permanently strain
max stress =
ultimate strength
fracture strength
stress at which a material fractures
what to strengths are the same in ceramics
ultimate and fracture strength
elastic modulus is equal to
stress/strain to represent the stiffness of the materials within the elastic range
a higher elastic modulus can be described as more soft or rigid
rigid
resilience is the resistence to
permanent deformation
toughness is the resistence to
fracture
hardness
resistance to permanent surface indentation
friction is
resistance between contacting bodies when moving relative to one another
wear
loss of material from the removal and relocation
