Term
| the three types of forces/loads applied to a solid |
|
Definition
|
|
Term
| Internal force in a material which resists an externally applied load |
|
Definition
|
|
Term
| Change in dimensions of a material as result of applied force |
|
Definition
|
|
Term
|
Definition
| Value of stress where stress/strain deviates from linear behavior |
|
|
Term
| Amount of stress which corresponds to specific amount of strain |
|
Definition
|
|
Term
| Amount of stress for first measurable permanent deformation |
|
Definition
|
|
Term
| Slope of linear portion of stress/strain |
|
Definition
|
|
Term
| units for modulus of elasticity |
|
Definition
|
|
Term
| stress corresponding to maximum value of load, before rupture occurs |
|
Definition
| ultimate (tensile) strength |
|
|
Term
| compared to an alloy, a metal has more or less melting temperatures |
|
Definition
metals only have one melting temperature
(the fusion temperature) |
|
|
Term
|
Definition
| amount of stress of material before rupture |
|
|
Term
| ability of a material to undergo permanent deformation without rupturing |
|
Definition
|
|
Term
| ability of material to undergo compression without rupturing |
|
Definition
|
|
Term
| the rigidity of a material |
|
Definition
|
|
Term
| amount of energy recovered during an elastic deformation |
|
Definition
|
|
Term
|
Definition
| total energy absorbed prior to rupture |
|
|
Term
| tough materials have high values of which properties? |
|
Definition
| ultimate tensile strength proportional limit strain |
|
|
Term
| Which has a higher proportional limit, dentin or enamel |
|
Definition
|
|
Term
| which has a higher modulus of resilience, dentin or enamel |
|
Definition
|
|
Term
| the maximum stress applied to the center of a material aligned as a beam prior to rupture |
|
Definition
|
|
Term
| measure of the tensile properties of a brittle material |
|
Definition
| diametral tensile strength |
|
|
Term
| failure of a material undergoing load and unload cycles |
|
Definition
|
|
Term
| Fatigue occurs below or above the UTS? |
|
Definition
| Below (fracture would occur above...) |
|
|
Term
| the permanent deformation of a material under constant stress over time |
|
Definition
|
|
Term
| Creep occurs below or above the Proportional Limit |
|
Definition
| Below (since deformation without any lapse in time would occur above the limit) |
|
|
Term
| If a material does not deform in a plastic way, the UTS point will have high or low stress? |
|
Definition
|
|
Term
| A flaw is more dramatic when undergoing tensile force in a brittle or ductile material? |
|
Definition
brittle, as a crack will develop
ductile materials will 'even out' the flaw when pulled |
|
|
Term
Rank in order of closest packing:
ceramic, polymer, metal |
|
Definition
polymer- poor packing
ceramic- less dense packing
metal- close packing |
|
|
Term
| an embryo of growing crystal forms a |
|
Definition
|
|
Term
| small/large grains give rise to better mechanical properties? |
|
Definition
|
|
Term
| list some ways grain size can be controlled |
|
Definition
rapid cooling
mold design
nucleating agent
vibration during cooling
high temp. differential b/w mold's wall and alloy |
|
|
Term
| Ru, Rb, CaSi, Co can be used as ___ in alloys |
|
Definition
| nucleating agents, cause smaller grains |
|
|
Term
| the deformation of a metal that involves one layer of atoms slipping over the other |
|
Definition
|
|
Term
| atoms in crystal structure that are out of line with lattice planes |
|
Definition
|
|
Term
| a dislocation line at the edge of a crystal can cause a... |
|
Definition
|
|
Term
| a simple method of strain hardening |
|
Definition
|
|
Term
| effects of strain hardening |
|
Definition
lower ductility
higher tensile strength
higher proportional limit
lower corrosion resistance |
|
|
Term
| heating a metal to half of its fusion temperature |
|
Definition
|
|
Term
| three stages of annealing |
|
Definition
recovery
recrystallization
grain growth |
|
|
Term
| wrought or cast metal is the result of strain hardening? |
|
Definition
|
|
Term
| wrought or cast metal is the result of annealing |
|
Definition
|
|
Term
| an alloy can be a mixture of metal and non-metal? |
|
Definition
|
|
Term
| amounts of each metal in an alloy are usually presented as... |
|
Definition
|
|
Term
| a substitutional alloy has atoms of the same or different size? |
|
Definition
|
|
Term
| what are the upper and lower lines on a phase diagram |
|
Definition
upper is the liquidus
lower is the solidus |
|
|
Term
| process of heating to diffuse different metals together |
|
Definition
|
|
Term
| a non-homogenous mixture of metals due to non-equilibrium cooling rates |
|
Definition
|
|
Term
| a consequence of a cored alloy? |
|
Definition
corrosion
(between dissimilar atoms) |
|
|
Term
| when components are completely soluble in liquid state, but have limited solubility in solid state |
|
Definition
|
|
Term
| brittle, high hardness, high strength are all properties of ... |
|
Definition
|
|
Term
| a mixture of polymeric resins |
|
Definition
|
|
Term
|
Definition
|
|
Term
| some physical considerations of the oral environment |
|
Definition
biting forces/stresses
temp changes
pH changes |
|
|
Term
Face Centered Cubic:
Body Centered Cubic:
Hexagonal Close Packed: |
|
Definition
FCC- Au Ag Pd
BCC- Fe
HCP- Ti |
|
|
Term
| amorphous is synonymous with |
|
Definition
|
|
Term
| This type of material has a glass transition temperature |
|
Definition
|
|
Term
| a contact angle of less than 90 degrees is... |
|
Definition
goooood wetting
(poor wetting, greater than 90, think of a large droplet on surface) |
|
|
Term
| complete wetting has a contact angle of |
|
Definition
|
|
Term
| an amorphous substance in a good solvent is more or less compact? |
|
Definition
| less compact, less tangled |
|
|
Term
| Rheology is the measure of |
|
Definition
|
|
Term
| rate of change of temp as heat passes through |
|
Definition
|
|
Term
| change in length over change in temperture |
|
Definition
| coefficient of thermal expansion |
|
|
Term
| displays a linear relationship between force and velocity |
|
Definition
|
|
Term
| a small increase in force leads to a large increase in velocity |
|
Definition
|
|
Term
| increase in force leads to a small increase in velocity |
|
Definition
|
|
Term
| the initial application in force results in no movement, but then at some value becomes newtonian |
|
Definition
|
|
Term
|
Definition
when viscosity changes over time, under stress
(similar to pseudoplastic, but with element of time) |
|
|
Term
|
Definition
| Thickness over (sq. root of) Thermal Diffusivity |
|
|
Term
| change in length when temperature raised 1 degree |
|
Definition
| coefficient of thermal expansion |
|
|
Term
| viscosity (formula, units) |
|
Definition
shear stress / shear strain rate
centipose or mPa-sec (NOT mega, but milli) |
|
|
Term
|
Definition
| viscosity dependent on previous deformation |
|
|
Term
|
Definition
|
|
Term
| having a high ratio of specular to diffuse reflection would have a ... |
|
Definition
higher gloss
(specular, like direct beam
diffuse, indirect) |
|
|
Term
|
Definition
| degree to which a substance of a certain color imparts THAT color |
|
|
Term
| a higher value in shade refers to a ___ tooth |
|
Definition
|
|
