smart and modern materials Flashcards
(21 cards)
smart materials are?
materials whose physical propertied change in response to an input or change in environment (electricity or temp etc)
what are modern materials
developed through invention of new or improved processes, as a result of man made materials
DO NOT REACT TO EXT CHANGE
thermo ceramics
metal powder is place din a mould or die under pressure - forcing particles to bond
thermoceramics are very hard and stable at high temps (100c)
turbine blades, metal cutting tools
shape memory alloys
changes shale in response to a change in temp or electrical input
nitonal wire in dental braces change length in response to change in temp
reactive glass
glass reacts to a change in temp by chnaging the tint
glass gets hot - glass darknes to block heat from entering glass
apartment windows
liquid crystal displays
liquid crystals change colour when an electric voltage is applied - cell turns from light to dark
digital clocks and watches, computer screens
photochromic material
changes colour with light intensity
welding goggles
thermo chromic material
changes colour in response to temp change
room thermometer, medical/ bath temps
quantum tunnelling composites
insulatong rubber containing tiny metal particles
material is force sensing a the material changes from electrical insulator to conductor when applied force
touch screen tech
conductivity as a property of materials?
- electrical conductor - allows the flow of electrical current through the material
- electrical insulator - doesn’t allow the flow of electricity through the material
thermal conductor- allows the transfer of heat energy through the material
thermal insulator - prevents transfer of heat though material
strength as a property?
bending strength - ability to resist forces that may bend the material
compressive strength - the ability to withstand being crushed or shortened by pushing forces
tensile strength - the ability to resist stretching or pulling
shear strength - the ability to resist sliding forces on a parallel plane
torsional strength - the ability to withstand twisting forces from applied tension
elasticity
the ability to be deformed and then return to the original shape when force is removed
plasticity
ability to be permanently deformed and retain the deformed shape
malleability
ability to withstand deformation by compression without cracking
ductility
the ability to be drawn out under tension
hardness
the ability to resist abrasive wear
toughness
ability to absorb impact force without fracture
durability
ability to withstand general wear
biodegradability
the ability to naturally decompose by the actions of bacteria
