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Lecture Demonstration Packages - A Recent Addition to DoITPoMS

Prof Bill Clyne | Cambridge University

Lecture Demonstration Packages  -  A Recent Addition to DoITPoMS

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The DoITPoMS (www.doitpoms.ac.uk) libraries of Micrographs, Videos and Teaching and Learning Packages (TLPs), which date from the start of the century (and are currently accessed by about 5,000 people per day), have recently been supplemented by a set of Lecture Demonstration Packages (LDPs) - see www.doitpoms.ac.uk/ldplib/index.php. These contain information about short (~3-5 minutes) practical demonstrations to be carried out within a lecture, aimed at illustrating a particular point or two within a Materials Science course. They are designed as a resource for Lecturers. They include a video showing the demonstration being performed, as well as background information about preparation, safety aspects, scientific context etc. The following LDPs are currently available: Cooling of Bi-Material Strips to generate Curvature: - shows how cooling of bi-material strips with liquid nitrogen causes curvature, and explains the relationship between this and the stiffness and thermal expansivities of the materials concerned. Crack Growth in Inflated Balloons: - looks at crack propagation in inflated balloons, covering the (Griffith) basics of fracture and stress fields in internally pressurised cylinders. Deformation Twinning in Low Symmetry Metals: - centred on tin cry, the characteristic sound heard when a bar of tin is bent so as to cause deformation twinning - common in structures of low crystallographic symmetry. Thermally-Induced Recovery of the Shape of a Spring: - a NiTi alloy is observed during deformation and subsequent heating, including an explanation of the shape memory effect and the 'shape training' process. Work Hardening in Metallic Polycrystals: - an introduction to work hardening in metals, via bending of a copper rod, giving some insights into dislocation creation and interactions. A brief outline will be given of the structure of LDPs, which provide the basic scientific background, the technical details needed to set up the demonstration and in some cases also include relevant simulations (of a type used in many DoITPoMS TLPs). The video gives an indication of how the demonstration can be carried out, or of course it could itself be used directly as a teaching aid. A few basic points will be made about aspects to be borne in mind when giving practical demonstrations in lectures.