Materials p. 373-377.

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Presentation transcript:

Materials p. 373-377

Types of materials Wood, Metal Plastic Stone Ceramic Textile Glass Synthetic materials

Wood Wood is a material that comes from cutting and processing trees. Use tree trunk (sapwood & heartwood) Roots, branches, bark→ no commercial value

Two principal types Hardwood: - from deciduous trees (Maple, Oak, etc.) - used furniture & flooring Softwood: - coniferous trees (Pine, Fir, etc.) - residential construction, paper

Hardwoods

Softwoods

Factors Affecting Mechanical Properties Species, growth rate, moisture content injuries sustained by tree, Mechanical Properties (table 12.9) - hardness, elasticity, resilience, ductility, malleability, tensile strength

Why use wood? Wood easily worked. Wood is easily to assemble. Wood is a good thermal insulator. Wood does not conduct electricity. See 12.12 p. 375

Modified Wood Modified wood is treated wood or material made with wood mixed with other substances

Advantages Stable mechanical properties More resistance to inclement weather Manufacture large materials Can be made from small trees Wood chips, & wood waste (saw dust)

Types Treated Wood- high temp. or copper chem. (objects in rain or snow) Laminated Wood - gluing wood (snowshoes, tables etc.) Plywood- gluing sheets of wood at right angles (work table, floors) Particle Board- made with wood chips & wood waste (building construction, trunks, toys) Fibreboard- wood fibres and smaller bits (insulation etc. etc.)