Until now, it was assumed that the modulus of elasticity depends mainly on the glass transition temperature. The higher it is, the more stable the glass will be. By examining a large number of different glasses ranging from ice in a glassy state to metallic glasses, Prof. Rouxel was able to show that the interrelationships are more complex. Poisson‘s ratio, in particular, which is of great importance to the mechanical properties of a material, in other words the ratio between the relative variation in thickness and the relative variation in length under the influence of an external force or tension also depends on the short or medium-range structural arrangements inside a glass.
With the help of so-called “indentation” measurements, in other words the scratch patterns on glass, statements can be made on the mechanical properties of glass. The method itself has been known for quite some time; however, Professor Tanguy Rouxel (below) developed the apparatuses much further and thus gained new insights on a number of new materials. Photos: LARMAUR
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Research and Technology Development