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Characterisation of anisotropic materials at high rates of strain

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Measuring the response of materials to uniaxial loading is a key component of any mechanical characterisation strategy. Typically, cylindrical specimens with circular cross-section are used. However, many engineering metals have anisotropic mechanical properties, which result in this cross-section becoming elliptical. This talk will show how straightforward techniques can be used to reconstruct the elliptical cross-section under quasi-static and high strain rate loading. A further challenge in these experiments is accurate multi-point measurement of specimen displacement: a novel technique is presented which uses the natural surface texture of the specimen to make such measurements with very high data densities. Finally, the geometry reconstruction technique is applied to experiments including Taylor Impact and Hopkinson bar tests on titanium alloys and zirconium.

This talk is part of the Surfaces, Microstructure and Fracture Group series.

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