MATERIALS Part 2: Types of Materials MECHANICAL PROPERTIES

MATERIALS Part 2: Types of Materials MECHANICAL PROPERTIES

MATERIALS Part 2: Types of Materials MECHANICAL PROPERTIES OF MATERIALS Hardness: ability to resist indentation or abrasion Elasticity: ability to return to original shape after undergoing a constraint Resilience: ability to resist shock without breaking Ductility: ability to be stretched without breaking

Malleability: ability to be flattened or bent without breaking Stiffness: ability to retain shape when subjected to various constraints WOOD Wood material from trees Two Types Hard wood high hardness; comes from deciduous trees (i.e. maple) Soft wood low hardness; comes from conifer trees (i.e. pine) Mechanical properties of wood Vary with

Tree species Speed of Growth (dependent on environmental conditions) and Injuries Water content of the wood TYPES OF WOOD Hardwood Softwood WOOD Other properties of wood Hardness, Elasticity, Resilience and Toughness

Low Thermal and Electrical Conductivity Ease it can be shaped Colour and Shades Lightness MODIFIED WOOD Is treated wood or a material made from wood mixed with other substances Made by gluing together pieces, sheets or residue of wood left over after timber harvesting Properties of modified wood more consistent than regular wood

Examples Plywood, Particleboard, Fibreboard TYPES OF MODIFIED WOOD Particleboard Plywood METALS AND ALLOYS Metals Material extracted from

mineral ore Properties: Shiny Malleable Ductile Good electrical conductivity Alloys Mixture of a metal with one or more other substances These other substances can be metallic or non-metallic

Two types Ferrous Alloy (main component is iron) Nonferrous Alloy (main component something else than iron) PLASTICS Made from fossil fuels Monomers are extracted and arranged in chains to form polymers Plastics made from polymers which other substances can

be added to, to get specific properties Are poor conductors of heat and electricity TWO CATEGORIES OF PLASTICS Thermoplastics Thermosetting Plastics Plastic that becomes soft enough when heated to be molded/remolded and that hardens enough when cooled

Plastic that remains permanently hard (even when heated) of plastics produced in the world Harder and more resilient than thermoplastics Some are recyclable (need to

have sign) Not recyclable in Quebec Melamine; polyesters

Recently Viewed Presentations

  • Elements of Literature: Character

    Elements of Literature: Character

    Three kinds of irony are verbal irony [End of Section] situational irony dramatic irony In verbal irony, a speaker says one thing but means the opposite. Verbal irony can become sarcasm if taken to a harsh extreme is the simplest...
  • Research and Development Contract Administration

    Research and Development Contract Administration

    The Limitation of Cost Clause also states: The Government is not obligated to reimburse the Contractor for any costs over the amount of the funds allotted, nor is the Contractor obligated to continue working or incur costs if the costs...
  • PowerPoint Presentation

    PowerPoint Presentation

    Unlike HTML controls, ASP.NET controls preserve their content if and when this is needed Server Side Technologies: ASP/.NET Session Tracking If the server (Web Host) running the server side script interacts with multiple clients (such as multiple customers buying goods...
  • Writing Roots as Exponents & Simplifying Algebraic Expressions

    Writing Roots as Exponents & Simplifying Algebraic Expressions

    Times New Roman Arial Symbol Default Design iRespondQuestionMaster iRespondGraphMaster 1_Default Design 2_Default Design 3_Default Design 4_Default Design 5_Default Design 6_Default Design 7_Default Design 8_Default Design 9_Default Design 10_Default Design 11_Default Design 12_Default Design 13_Default Design 14_Default Design 1 ...
  • Dealing with complexity: How to address MPA management in ...

    Dealing with complexity: How to address MPA management in ...

    Coping with complexity: MPA management in Indonesia Leontine Visser Wageningen University, Netherlands WorldFish Center 17 November 2009 Research Proposal WU/RDS initiated workshop in Wageningen in June 2009 with WF (Dedi), IPB Bogor, ZMT Bremen; (TNC); collaboration with Murdoch (Perth) Funded...
  • Science with Antarctic Infrared and Sub-millimetre Telescopes

    Science with Antarctic Infrared and Sub-millimetre Telescopes

    The UNSW-CSIRO Millimetre Collaboration: An overview of the Star Formation Program Michael Burton UNSW / CSIRO Collaboration MNRF-funded upgrade to ATCA (1997) UNSW SIP grant (1999-2001): Extend dish to 22-m for mm-capable performance Operate over mm "season" Research Tool Teaching...
  • Expected Value - ASU

    Expected Value - ASU

    Expected Value Section 3.5 Definition Let's say that a game gives payoffs a1, a2,…, an with probabilities p1, p2,… pn. The expected value ( or expectation) E of this game is E = a1p1 + a2p2 + … + anpn.
  • Georgia Gateway - Integrated Eligibility System (IES)Update

    Georgia Gateway - Integrated Eligibility System (IES)Update

    USDA National State Systems Office (SSO) Director, Mark Barner and Kathy Tankersley, visited Henry County WIC on August 23, 2017, to observe Gateway. They observed the system in the DFACS office and we reviewed our training and implementation procedures. A...