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Ortho3

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robbypowell's version from 2016-10-20 01:35

ortho materials/wires

Question Answer
alignment of teeth and leveling of curve of spee usually use _____ forces (light/heavy)Light
____: internal force resisting external forceStress
____: molecular movement from internal forceStrain
stress relates to strain in a linear fashion within the _____ _____Elastic Modulus
point at which the stress-strain curve changes from elastic to non elastic... permanent bending (not breaking)Yield Strength
stiffness in ______ relates to the stress/strain curvetension
stiffness in ______ relates to the load/deflection curvebending
different diameter of wire, (large and small) same material... would they differ in stress/strain curve?No
different diameter of wire, (large and small) same material... would they differ in load/deflectio curve?Yes (larger diameter less deflection, smaller diameter more deflection)
_____ = stiffness * rangeStrength
_____ strength is synonymous with resilienceYield (how hard to bend)
_____ strength is synonymous with toughnessUltimate (how hard to break)
_____: the load that you can apply to stay in the elastic range and non permanently deform or break the wireRange
do cast-molten or wrought wire have greater yield-strength?wrought wire
composition of this metal alloy is iron, carbon, 18% chromium, and 8% nickelStainless steel
stainless steel properties: ____ (high/low) force delivery; ____ (high/low) elastic rangeHigh; Low
T/F: an advantage of stainless steel is that it is easily solderedTrue
_____ dissolves oxides off the surface of metal (for use with soldering)Flux
several small diameter stainless steel wires used instead of one large diameter wire ______ (inc/dec) the stiffness and _____ (inc/dec) rangedecrease stiffness; increase range
Wire material best suited to light force deliveryNiTi
Wire material with a lot of memory/springbackNiTi
T/F: an advantage of NiTi is that it is easily solderedFalse
wire material that can be easily bent into loops helices and springsStainless steel
T/F: an advantage of NiTi is that it can be spot welded without solderFalse (TMA)
T/F: an advantage of TMA is that it can be spot welded without solderTrue
Increased force _____ (increases/decreases) deflectionIncreases
Increased wire length _____ (increases/decreases) deflectionIncreases
Increased wire diameter _____ (increases/decreases) deflectiondecreases
Increased elastic modulus of wire _____ (increases/decreases) deflectionDecreases
______ = (force * Length^3)/(elastic modulus * moment of inertia)Deflection
T/F: A small change in diameter creates a large change in amount of deflectiontrue
Which has a bigger influence on deflection in round wire... Length or wire diameter?Diameter (to the power of 4 rather than 3)
T/F: thickness of rectangular wire has less of an effect on deflection than does diameter of round wireTrue (to the 3rd power... but only bc "base dimension" isn't captured in rectangular wire's "thickness")
memorize

which wire type

Question Answer
difficult to join (together with the same material)NiTi
Spot welded for joining without solderTMA (Titanium Molybdenum alloy)
Easily solderedStainless steel
has HALF the stiffness of stainless steelTMA
has HALF the stiffness of TMANiTi
has twice the stiffness of NiTiTMA
has twice the stiffness of TMAstainless steel
highest springback (memory)NiTi
Low stiffness (lighter forces applied)NiTi
Intermediate stiffness (intermediate forces applied)TMA
Intermediate springback (memory)TMA
High stiffness (strong forces applied)Stainless steel
Lowest springback (memory/elastic range)Stainless steel
memorize

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