DT Flashcards
Composites
A composite is a material produced from 2 or more constituent materials.
Examples of composite materials
- Carbon Fibre Reinforced Polymer
- Glass Reinforced Polymer
- Glass Reinforced Concrete
- Steel Reinforced Concrete
- Concrete
- Polymer
Thermoforming polymers
Granules are heated, become liquid, are molded then set. This process is repeated, meaning these polymers are technically recyclable.
What does thermo mean?
Thermo = Heat
Thermoset Polymers
Thermoset Polymers can’t be melted. Their heat resistance makes them suitable for uses where this property is key - saucepan handles, worktops, plugs and sockets etc.
Smart Materials
Materials that react to an external stimulus in a consistent and repeatable way.
3 examples of smart material stimuli
heat
light
electrical current
What does photo mean?
Photo = Light
What does chrome/chromic mean?
Chrome/Chromic = Colour
Examples of smart stimuli
Thermochromic ink
Shape memory alloy
Photochromic pigment
Manmade boards
Timber derived engineered boards. Generally a composite of wood fibres, chipsor layers, bonded with resin.
Examples of manmade boards
Plywood
MDF
Chipboard
Benefits of manmade boards
- Large sheet size
- stable
- rigid
- more ‘isotropic’ than - natural timber
Density
the mass of a material in a standard volume - Physical Property
Fusibility
the ability of a material to be converted from a solid to liquid state, usually by heat - Physical Property
Magnetism
attractive to iron or steels - Physical Property
Degradation resistance
the ability to withstand weathering and other environmental forms of wear - Physical Property
Electrical conductor/insulator
allows the flow of current or resists it - Physical Property
Thermal conductor/insulator
Allows the flow of heat or resists it - Physical Property
Thermal expansion
the increase in volume of a material with the application of heat - Physical Property
Opacity
Prevents light transmission - Physical Property
Translucence
allows diffuse light through - Physical Property
Transparency
Allows light through - Physical Property
Compressive strength
the ability to withstand being crushed or shortened by pushing forces - Mechanical Property
Tensile strength
the ability to resist being stretched by pulling forces - Mechanical Property
Bending strength
the ability to resist bending forces - Mechanical Property
Shearing strength
the ability to resist parallel sliding forces - Mechanical Property
Torsional strength
the ability to withstand twisting forces - Mechanical Property
Hardness
the ability to withstand abrasive wear - Mechanical Property
Toughness
the ability to withstand impact - Mechanical Property
Plasticity
the ability to be deformed and retain the deformed shape - Mechanical Property
Ductility
the ability to be drawn out under tension without cracking - Mechanical Property
Malleability
the ability to be compressed under pressure without cracking - Mechanical Property
Elasticity
the ability to be deformed and then return to shape once the deforming force is removed - Mechanical Property
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Reciprocating
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Linear
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Rotary
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Oscillating
Anthrometrics
Human measurements . The study of anthropometry allows products to be designed to fit human users
User Centred Design
A design approach centred on the needs of the end user
What is a lever?
A fixed rigid beam requiring a fulcrum, load and effort to provide mechanical advantage.
What is a fulcrum?
The point at which a lever pivots
allow
a mixture of two or more metals or a metal and non metal, with resulting enhanced properties
