Wood: A Versatile Engineering Material


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Wood: A Versatile Engineering Material

  1. 1. Wood A versatile engineering material By Hugh Mullan BSFTL, SMCIOB
  2. 2. Todays Lecture <ul><li>Definition of ‘versatile’ </li></ul><ul><li>Is wood versatile? </li></ul><ul><li>Why so? </li></ul><ul><li>Definition of an ‘engineering material’ </li></ul><ul><li>Wood as an engineering material </li></ul><ul><li>To sum up </li></ul>
  3. 3. Versatile <ul><li>Turning easily from one thing to another </li></ul><ul><li>Of many sided ability </li></ul><ul><li>Capable of many uses </li></ul><ul><li>The Chambers Dictionary, © 2003, Chambers Harrap Publishers Ltd. </li></ul>
  4. 4. Is wood versatile?
  5. 5. Turning easily from one thing to another <ul><li>Timber does not require energy intensive processing </li></ul><ul><li>The product energy requirement, in kilowatt hours, is 8 times higher for a PVC-U window compared to a timber window </li></ul><ul><li>The manufacture of steel components uses 4,000 times more energy than its timber equivalent </li></ul><ul><li>Concrete creates 5 times as much solid waste </li></ul><ul><li>Timber is inherently recyclable </li></ul><ul><li>www.forestsforever .org.uk </li></ul>
  6. 6. Large and small structures Capable of many uses
  7. 7. Where is wood used Many sided ability
  8. 8. Why is wood versatile?
  9. 9. An engineering material <ul><li>Engineering: ‘ … in its modern and extended sense, the art and science by which the mechanical properties of matter are made useful to man in structures and machines…’ </li></ul><ul><li>Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. </li></ul>
  10. 10. Mechanical Properties of wood <ul><li>A light construction material with a high strength to weight ratio </li></ul><ul><li>Relatively easy to work with simple tools. </li></ul><ul><li>“ Anisotropic / Orthotropic” </li></ul><ul><li>“ Unidirectional” </li></ul><ul><li>Natural and therefore may be susceptible to biodeterioration </li></ul>
  11. 11. Specific mecanial properties <ul><li>Is wood a material? </li></ul><ul><li>How strong is it? </li></ul><ul><li>How heavy is it? </li></ul><ul><li>How elastic or rigid is it? </li></ul><ul><li>How stable? </li></ul><ul><li>How durable? </li></ul>
  12. 12. A set or range of materials <ul><li>Mechanical properties variable by </li></ul><ul><li>Species </li></ul><ul><li>Type </li></ul><ul><li>Growth regime and geography </li></ul><ul><li>Location within a single tree </li></ul><ul><li>Processing at all stages </li></ul><ul><li>Manufactured wood products </li></ul>
  13. 13. A range of materials <ul><li>Different species suitable for different applications </li></ul><ul><li>Manufacured wood products extend the range of applications </li></ul><ul><li>Treatment can do this also </li></ul><ul><li>Suitability not exclusive </li></ul>
  14. 14. Manufactured wood products <ul><li>Between half and two thirds of all solid timber goes to waste during the sawing and dimensioning process. </li></ul><ul><li>Manufactured wood products make use of timber waste and so represent an efficient use of resources. </li></ul><ul><li>Eco, © 2005 Quadrille Publishing Ltd. </li></ul>
  15. 15. To sum up <ul><li>Wood is extremely versatile and continues to be one of the most widely used materials, often in combination with metals, plastics, glass or other materials (furniture, construction). The processing of wood (sawn timber, veneer, boards), its manufacture into finished products (structural components, wooden units, furniture, wooden products) and use, above all in the chemical industry (cellulose, paper, fibreboard), have resulted in the development of wood specialist training in the fields of industrial engineering and materials engineering. </li></ul><ul><li>Source: www.studienwahl.de </li></ul>
  16. 16. Further Information <ul><li>Forests Forever: www.forests forever.co.uk </li></ul><ul><li>Forest Stewardship Council: www.fsc-uk.demon.co.uk </li></ul><ul><li>Building Research Establishment: www.bre.co.uk/timber </li></ul><ul><li>Wood Web: www.woodweb.com </li></ul><ul><li>Softwood Export Council: www.softwood.org </li></ul>