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Lect 1 Materials and manufacturing (Materials (Polymers Repeating…
Lect 1
Materials and manufacturing
Materials
Metals
Ferrous metals
based on iron, 75% of metal tonnage
steel and cast iron
Non ferrous metal
other metallic elements and alloys
Al, Cu, Ag
Polymers
Repeating structural units
Usually consists of carbon
Thermoplastics polymers
subject to multiple heating
and cooling cycles without
altering molecular structure
Thermosetting polymers
molecules chemically transform
into a rigid structure during curing
Elastomers
Show significant elastic behavior
Ceramics
Compounds contain metallic/semi
and non-metallic elements
Crystalline ceramics
Traditional ceramics: Clay
Modern ceramics: Alumina (AL2O3)
Glass
mostly based on silica (SiO2)
Manufacturing processes
Shaping operation
change the geometry of the starting material
Deformation processes
Starting material is ductile solid
(commonly metal)
Material removal processes
Starting material is a ductile or brittle solid
Particulate processing
Starting material consists of powders
Solidification processes
Starting material is a heated
liquid or semi-liquid
Starting material is heated sufficiently to transform it
into a liquid or highly plastic state
Assembly operations
Join two or more components
to create a new entity
