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Newey with plastic sculpture of a reclining female nude by Anthony Donaldson. He tells why the sculptor used G.R.P. (plastic) Newey discusses the nature of composite materials. Shot of model of a ...cube of wood magnified 1000 times to show the composites of cellulose fibres and resin. Shot of a tooth. Shot of a tooth section showing the composites of enamel and dentine. Both of these materials are composites. Shot of enamel magnified 1000 times to show its composite nature. Newey shows examples of and explains the nature of plastics laminates. Newey examines the fibres in fibre based composites. He shows a bundle of glass fibres, the starting material for G.R.P. and other composites. Shots of glass fibres in various forms; matts, weaves, etc. Newey smashes a sheet of ordinary plaster (Gypsum) He tries to smash a similar sheet but containing 4% glass fibres. The sheet does not break. Prof. Gordon explains how addition of glass fibres improves composite materials. (Stronger, stiffer, less brittle) Gordon smashes, a glass pane. Gordon smashes a sheet of clear resin. Gordon tries to smash a sheet of reinforced resin. It does not break. Gordon with a glass fibre canoe and glass fibre crash helmet. He tries to smash the helmet with a hammer. Gordon explains how resins are made stronger by the introduction of fibres. Newey draws diagram showing stress concentration. The material he has pictured has an incipient crack in it. Newey points out the stress concentrations. He includes a fibre interface to show how it breaks up the stress concentration. Shot of reinforced plastic showing the failure of adhesion between resin and fibre after repeated blow. Small cracks reflect the light. Gordon with stress testing machine. Sheet of rubber is inserted. Shallow grooves are cut in the rubber to represent weak interfaces. Gordon cuts a tear at right angles to the interfaces without intersecting them. The rubber is then stretched. As the tear widenes the interfaces, ahead of the crack split open slightly but dont allow the main tear to spread. This is analogous to a fibre enforced- resin under stress. Shot of a piece of glass fibre reinforced plastic in testing machine. As stress is applied small cracks are seen at the interfaces ahead of the main split. This impedes the progress of the main split. Shots of glass fibres being manufactured. The fibres are wound on bobbins. Shots of glass fibres being cut into small 1 inch sections in preparation for manufacture of reinforced plastics. Shots of glass fibres and liquid gypsum being sprayed on to a wet plastic sheet to make a panel. The panel is trimmed, leveled and then placed on a molding press. Beams are bonded on and another panel is bonded to the beams. The result is a glass fibre, pre-fabricated floor unit for a house or flat. Shots of the manufacture of carbon fibres. The properties of carbon fibres are shown and explained. A model of the molecular structure of carbon fibres helps in the explanation. Shots of conversion of acrylicts to carbon fibre in a furnace. Leslie Phillips explains and shows how a 0.5" by 0.5" composite bar of carbon fibres and plastic resin is made. Shot of Newey and the nose cone of a racing car made of G.R.P. This car includes reinforcing struts of carbon fibre, composites and these are shown. Shots of a bicycle which has a frame made of carbon fibre composites. Gordon sums up some of the advantages of composite materials and also discusses some of the disadvantages. Shots of Gordon bashing a bone with a hammer to illustrate his point that engineers have much to learn from biological toughness. Shots of skiers on the 100 metre ski jump.
Metadata describing this Open University video programme
Module code and title: T100, The man-made world: a foundation course
Item code: T100; 22
First transmission date: 18-06-1972
Published: 1972
Rights Statement:
Restrictions on use:
Duration: 00:24:20
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Producer: Colin Robinson
Contributors: J Gordon; Charles Newey
Publisher: BBC Open University
Keyword(s): Carbon fibre; Composites; Cracking; Engineering; Glass fibre; Toughness; Wood and bone
Master spool number: 6LT/70377
Production number: 00521_2517
Videofinder number: 2165
Available to public: no