Danylenko Vyacheslav A, Mykulyak Sergiy V, Polyakovskyi Volodymyr O, Kulich Vasyl V, Oleynik Ivan I
Subbotin Institute of Geophysics, NASU, Kiev 03680, Ukraine.
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Phys Rev E. 2017 Jul;96(1-1):012906. doi: 10.1103/PhysRevE.96.012906. Epub 2017 Jul 28.
Force distribution in a granular medium subjected to an impulse loading is investigated in experiment and computer simulations. An experimental technique is developed to measure forces acting on individual grains at the bottom of the granular sample consisting of steel balls. Discrete element method simulation also is performed under conditions mimicking those in experiment. Both theory and experiment display exponentially decaying maximum force distributions at the bottom of the sample in the range of large forces. In addition, the simulations also reveal exponential force distribution throughout the sample and uncover correlation properties of the interparticle forces during dynamic loading of the granular samples. Simulated time dependence of coordination number, orientational order parameter, correlation radius, and force distribution clearly demonstrates the nonequilibrium character of the deformation process in a granular medium under impulse loading.
