Deformation Field in Indentation of Granular Materials
Tejas Gorur Murthy, Ebenezer P. Gnanamanickam, Christopher Saldaña, Srinivasan Chandrasekar, Masami Nakagawa, Stefan Luding · AIP conference proceedings · 2009
A preliminary study has been made of the deformation field in indentation of a model granular material using particle tracking optical flow analyses. A continuum composed of spherical sand particles with average size of 0.4 mm is indented with a flat punch under plane‐strain conditions. The region around the indenter/indentation is imaged in situ using a Charge‐Coupled Device (CCD) imaging system. By applying this hybrid analysis technique to image sequences of the indentation parameters of the deformation field such as displacement, velocity, and velocity gradient are measured at high spatial resolution. Implications of the measurement technique for accurate determination of local strain and strain rate, and exploring phenomena such as friction shear bands, in granular solids are briefly discussed.