- Created by: saraswati
- Created on: 03-05-09 17:08
AESTHETIC PROPERTIES 1
- Materials are selected because of their natural colour.
- Colour can be enhanced through treatments such as heat,chemicals,pigments,dyes or natural finishes.
E.G Acrylic is often chosen to make signs because it is available in a wide range of bright colours requiring little finishing.
- Dictated by fashions
- Reconisable by form or decorative details.
E.G An architect restoring an old cottage may choose tradionl materiels rather than modern materiels.
AESTHETIC PROPERTIES 2
- materials are selected because of thier natural textures
- added to materials during manufacturing to improve product appeal (ag moulding, embossing or by adding other materials)
E.G a foam model for a new camera can be enhanced by adding small, self adhesive, paper circles which can be sprayed to give he impression of mould detaiils.
FUNCTIONAL PROPERTIES 1
- ability to withstand force without breaking or permanent bending
- TENSILE STRENGHT - resistance to stretching forces
- COMPRESSIVE STRENGHT - resistance to pushing forces
- BENDING STRENGHT - resisitance to bending forces
- SHEAR STRENGHT - resistance to sliding/cutting forces
- TORSIONAL STRENGHT - resistance to twisting forces
EG: plastics are more stronger than glass, which is very fragile & breaks easily therefore plastic bottles can be made much lighter than thier glass counterparts
- ability to withstand wear & tear
- factors influencing the choice of materials include the required lifespan of the product
- frequency of use
- demands placed upon the product
FUNCTIONAL PROPERTIES 2
EG: polythene bags for shopping will last longer & resist wear more effectively than paper bags
- ability to catch fire
- flammability is affected by material structure, moisture content, shape & form & air circulation
- regulations exist which establish minimum safety standards
EG: highly flammable foams & textile products used in homes must be treated with fire retardant chemicals
MECHANICAL PROPERTIES 1
- abilty to deform permanently under pressure
EG: thermoplastics can be moulded when heated
- the extent to which a metal will deform in all dimensions without failing (cracking or rupture)
EG: aluminium can be formed into complex shapes for some car bodies
MECHANICAL PROPERTIES 2
- the extent to which materials can be drawn down to progressively smaller diameters in one direction without fracturing
EG: copper is formed into long wires
- The ability to withstand wear, scratching & indentation
EG: steel & glass are hard to dent or scratch