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SUMMARY:Characterisation of anisotropic materials at high rates of strain 
 - Clive Siviour\, Department of Engineering Science\, University of Oxford
DTSTART:20101028T150000Z
DTEND:20101028T160000Z
UID:TALK25146@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Measuring the response of materials to uniaxial loading is a k
 ey component of any mechanical characterisation strategy. Typically\, cyli
 ndrical specimens with circular cross-section are used. However\, many eng
 ineering metals have anisotropic mechanical properties\, which result in t
 his cross-section becoming elliptical. This talk will show how straightfor
 ward techniques can be used to reconstruct the elliptical cross-section un
 der quasi-static and high strain rate loading. A further challenge in thes
 e 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. Fin
 ally\, the geometry reconstruction technique is applied to experiments inc
 luding Taylor Impact and Hopkinson bar tests on titanium alloys and zircon
 ium.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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