Displacement field measurements in traditional and rotational diamond anvil cells

A digital image correlation-based method has been developed to measure the displacement field during compression in a traditional diamond anvil cell (DAC) and torsion rotational DAC (RDAC) employing ruby fluorescence microscopy imaging. The optical arrangements for these measurements are adaptable at any commercial or customized micro-confocal system used situ high-pressure Raman spectroscopy. In this paper, we describe details of setup Iowa State University along with few demonstrative zirconium sample. particular, under DAC, no adhesion zone is found, relative sliding increases almost linearly radius. During RDAC, actual angular material found be 5 times smaller than rotation angle an anvil, which routinely definition plastic shear determination stress–strain curves strain-induced kinetics phase transformations grain refinement materials. Obtained displacements can as boundary conditions finite element (FEM) simulations processes RDAC instead hypothetical friction conditions. After iterative fitting FEM all measured fields from x-ray diffraction absorption experiments, will allow us more precisely determine contact parameters constitutive equations elastoplastic flow transformations.