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SUMMARY:Full field measurement technique enabling the discovery of new mat
 erials laws - Dr Zifan Wang\, CUED
DTSTART:20240216T140000Z
DTEND:20240216T143000Z
UID:TALK211795@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:X-ray computed tomography (XCT) is a reliable tool for measuri
 ng internal flaws and microstructural features in engineering materials. A
 s an extension to XCT\, Digital Volume Correlation (DVC) methodology enabl
 es tracking 3D deformation field based on local grayscale contrast. Nevert
 heless\, its applicability and spatial resolution have been limited by the
  need for tracer particles or inherent microstructural features that are d
 istributed in the material volume. To address these limitations\, we devel
 oped a Flux Enhanced Tomography for Correlation (FETC) technique that leve
 rages inherent inhomogeneities in engineering materials (polymers to metal
 s) to measure all nine components of the deformation gradient without rely
 ing on artificial X-ray tracers. Via this unprecedented full-filed measure
 ment technique\, the mechanical behaviour of various engineering polymers 
 was examined\, and new observations was made on the well-established rubbe
 r elasticity. It was found that many polymers undergo significant local vo
 lume changes but the overall volume remains constant during mechanical loa
 ding. The presence of a mobile phase within the material volume has been p
 roved which gives rise to negative local bulk moduli. By extending its app
 lication on other materials\, FETC is expected to bring more electrifying 
 discoveries of new material physics.
LOCATION:Oatley 1 Meeting Room\, Department of Engineering
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