DoITPoMS


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Stiffness, thermal expansion and the bi-material strip

This lecture demonstration package (LDP) concerns two simple elastic properties (the Young's modulus and the thermal expansivity), which can be understood in terms of inter-atomic forces (the Lennard-Jones potential). These two properties determine the curvature generated when a bonded pair of strips is exposed to temperature change. The practical involves cooling of three sets of bi-material strips by immersion in liquid nitrogen. The demonstration takes about 5 minutes.

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First created: Aug 2012.