dt p1 🔪

• Non ferrous metals


  Don’t contain iron

  zinc, copper, lead, tin
• Ferrous metals 


  Contain iron

  Stainless steel, cast iron, low carbon steel, nickel
• Hardness 


  Materials resistance to abrasion and scratching
• Toughness


  Ability to withstand impact without breaking
• Stiffness 


  Hold shape without bending
• Brittleness


  Material cannot absorb energy and so breaks into pieces
• Alloys 


  Metal made of two or more metals

  can be ferrous or non ferrous

  f: stainless steel

  nf: bronze, brass
• softwoods


  Coniferous trees, fast grow

  sprice, pine, redwood, cedar
• Hardwoods 


  Deciduous, slow growing

  oak, ash, mahogan, teak, birch,beech
• Thermoplastics


  can be repeatedly reshaped, reheated

  allows to be recycled

  nylon, low and high density polythene, LDPE/HDPE
• elastomers 


  Stretch easily due to weak bones

  deforms at room temp under pressure

  return to original shapes after pressure
• Composite material 


  2 or more materials resulting in enhanced properties
• Smart materials 


  Material whose physical properties change in response to change in environment

  light, temp, electricity, pressure
• Composites examples 


  GRP (glass reinforced plastic), CFRP (carbon fibre reinforced plastic),

  concrete, tungsten
• Smart materials examples


  SMA (shape memory alloys), phosphorescent pigment, thermochromtic film,
• Modern materials 


  Material developed through new tech improved processes/ do not react to external change, as a result of manmade materials or human intervention
• Modern materials examples 


  Kevlar, precious metal clay (PMC), polymorph
• Stock forms of metals 


  Sheet, bar, plate, tube
• stock forms of papers and boards

  A3/4, rough sawn, planned square edge (PSE), planned all round (PAR)
• Stock forms of polymers

  Powder, film, foam, rods and tubes, granules, sheet
• what do polymer additives do?

  enhance aesthetics, make polymers easier and less expensive to process, improve function, prevent degradation (longer life), encourage gradation
• Metal enhancement techniques


  Work hardening, annealing, case hardening, hardening -> tempering
• What paper and boards forming process is this?

  die cutting

  
• What polymer process is this?

  thermoforming

  
• What metal forming process is this?

  Die casting

  
• What metal process is this?

  Gravity die casting

  
• What polymer process is this?

  Injection moulding

  
• What polymer process is this?

  Lamination/ lay-up

  
• What polymer process is this?

  Blow moulding

  
• What polymer process is this?

  Extrusion

  
• What metal process is this?

  bending

  
• what metal process is this?

  Sand casting

  
• what polymer process is this?

  Calendering

  
• What polymer process is this

  vacuum forming

  
• What process is this?

  bending

  
• What polymer process is this?

  Line bending

  
• What polymer process is this?

  Compression moulding

  
• What metal process is this

  Rolling

  
• what polymer process is this?

  rotational moulding