technological materials

technological materials

1. RAW MATERIALS

   • Are products extracted directly from nature

2. natural and processed materials

   • industrial processes are applied to raw materials , also knownas natural resources , to turn them into processed materials

3. properties

   • MECHANICAL
     • ELASTICITY
       • THE ABILITY OF A MATERIAL TO RETURN TO ITS ORIGINAL SHAPE
     • BRITTLENES
       • THE ABILITY OF AN OBJECT TO BREAK EASILY , WITHOUT BEING DEFORMED HARDLY AT ALL
     • HARDNESS
       • THE RESISTANCE OF A BODY TO BEING PIERCED OR SCRATCHED BY ANOTHER BODY
     • PLASTICITY
       • THE ABILITY OF A BODY TO BECOME PERMANENTLY DEFORMED
     • TOUGHNESS
       • A BODY RESISTANCE TO BEING CHANGED , DEFORMED OR BROKEN
     • resistance
       • the ability of a body to resist the forces applied to it
   • thermal
     • expansion
       • the increase in size observed in a body
     • conductivity
       • the ability to transmit heat
   • environmental
     • toxicity
       • how strong a poison or toxin is
     • biodegradability
       • a materlia ´s ability to naturally decompose
     • reciclability
       • the possibility of reusing a material
     • hazard
       • the level of toxic effect

4. tools

   • the first tools
     • for many centuries,humans used their hands as tools
   • what is a tool?
     • objet designed to carry out mechanical work and task
   • machine tool
     • is used to refer to comlex tools

5. wood

   • what is the wood ?
     • is the fibrous material that trees are made of .
   • types
     • non-resinous
       • this kind of wood mainly comes from trees that have little resin and a fibrous texture
     • resinous
       • this kind of wood usually comes from evergreen trees wich produce resin
   • properties
     • hardness
     • flexibility
     • insulation
     • hygroscopicity
     • toughness
     • splitability
     • conductivity
     • density
   • forms
     • strips
     • mouldings
     • planks
     • beams
     • sheets
     • warps
     • plywood
     • chipboard
     • fibreboard
     • grains
     • panels
   • tools
     • cutting
       • handsaws
       • hacksaws
       • machine
     • drilling
       • boring
       • planing
     • impact
       • harmmers
       • mallets
     • assembly
       • spanners
       • screwdrvrs

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