Working Properties Of Materials

Aesthetic properties, Functional properties, Mechanical properties

HideShow resource information
  • Created by: saraswati
  • Created on: 03-05-09 17:08

AESTHETIC PROPERTIES 1

Colour:

  • 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.

Style:

  • 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.

1 of 6

AESTHETIC PROPERTIES 2

Texture:

  • 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.


2 of 6

FUNCTIONAL PROPERTIES 1

Strength:

  • 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

Durability:

  • 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
3 of 6

FUNCTIONAL PROPERTIES 2

EG: polythene bags for shopping will last longer & resist wear more effectively than paper bags

Flammability:

  • 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


4 of 6

MECHANICAL PROPERTIES 1

Plasticity:

  • abilty to deform permanently under pressure

EG: thermoplastics can be moulded when heated

Malleability:

  • 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

5 of 6

MECHANICAL PROPERTIES 2

Ductility:

  • 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

Hardness:

  • The ability to withstand wear, scratching & indentation

EG: steel & glass are hard to dent or scratch

6 of 6

Comments

No comments have yet been made

Similar Design & Technology resources:

See all Design & Technology resources »See all resources »