Engineering Materials. Volume 3 by W. Bolton (Auth.)

By W. Bolton (Auth.)

A self-contained overview of engineering fabrics - checking out, houses, remedy tactics and purposes overlaying BTEC unit U84/266. meant for college kids of mechanical and construction engineering at BTEC point NIII, the e-book comprises labored examples and difficulties

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A polymeric material under load can continue to change shape for the length of time for which the load is applied. A load which, when initially applied, was insufficient to cause yielding of the material might, with time, be able to do this. The tensile test data is immediate data without any attempt to take account of time. For this reason, stress-strain graphs are often derived from creep data in Mechanical properties of polymeric materials 33 order to take account of time, and are then known as isochronous stress-strain graphs.

Describe the effects of temperature and age on the properties. Select the relevant property data for a given service requirement for a component. POLYMERIC MATERIALS A polymer is a very large molecule comprising hundreds or even thousands of atoms. Such molecules are formed by linking together one or two types of small molecules to form chain or network structures. Polymers can be grouped into three categories: thermoplastics, thermosets and elastomers. Thermoplastics are based on chain structures.

C) The metal tubing used for the aerial for a car radio. (a) The legs will be subject to a steady loading due to the weight of the rig, have to operate at low temperatures and be subject to continuous buffeting by the sea. This would suggest that the material used will require good tensile properties. Since such properties would be required at low temperatures, an impact test could indicate whether the material would be brittle or ductile at such temperatures. The buffeting of the sea could lead to fatigue problems and so fatigue tests would be required.

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