Docstoc

Composite materials (PowerPoint)

Document Sample
Composite materials (PowerPoint) Powered By Docstoc
					Composite materials
      Composite materials
• Composite materials (or composites for
  short) are engineered materials made from
  two or more materials with significantly
  different physical or chemical properties
  and which remain separate and distinct on
  a macroscopic level within the finished
  structure.
           Engineered wood
• Engineered wood includes a wide variety of
  different products such as plywood, oriented
  strand board, wood plastic composite (recycled
  wood fiber in polyethylene matrix), Pykrete
  (sawdust in ice matrix), Plastic-impregnated or
  laminated paper or textiles, Arborite, Formica
  (plastic) and Micarta.

• Other engineered laminate composites, such as
  Mallite, use a central core of end grain balsa
  wood, bonded to surface skins of light alloy or
  GRP (glass reinforced plastic). These generate
  low-weight, high rigidity materials.
    Wood-plastic composite
• Wood-plastic
  composite
  (commonly
  abbreviated as WPC)
  is a recyclable
  composite material
  lumber or timber
  made of recycled
  plastic and wood
  wastes.
                    Advantges
• A major advantage over wood is the ability of the
  material to be molded.
• It can also be bent and fixed to form strong arching
  curves.
• Wood-plastic composites behave like wood and can be
  shaped using conventional woodworking tools.
• Moisture-resistant and resistant to rot, although they are
  not as rigid as wood and may slightly deform in
  extremely hot weather.
• A major selling point of these materials is their lack of
  need for paint as they are manufactured in a variety of
  colors, but are widely available in grays and earth tones.
      Oriented strand board
• Oriented strand board, or OSB, or
  waferboard, or Sterling board (UK), is an
  engineered wood product formed by
  layering strands (flakes) of wood in
  specific orientations. In appearance it may
  have a rough and variegated surface with
  the individual strips (around 2.5 by 15 cm
  (approx. 1 in by 6 in) each) lying unevenly
  across each other
      Oriented strand board
• It is manufactured in wide mats from
  cross-oriented layers of thin, rectangular
  wooden strips compressed and bonded
  together with wax and resin adhesives
  (95% wood, 5% wax and resin).
OSB- Before being pressed
       Resins as composites
• Typically, most common composite
  materials, including fiberglass, carbon
  fiber, and kevlar, include at least two parts,
  the substrate and the resin.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:74
posted:10/7/2011
language:English
pages:9