The influence of packing structure and interparticle forces on ultrasound transmission in granular media.

ABSTRACT: Ultrasound propagation through externally stressed, disordered granular materials was experimentally and numerically investigated. Experiments employed piezoelectric transducers to excite and detect longitudinal ultrasound waves of various frequencies traveling through randomly packed sapphire spheres subjected to uniaxial compression. The experiments featured in situ X-ray tomography and diffraction measurements of contact fabric, particle kinematics, average per-particle stress tensors, and interparticle forces. The experimentally measured packing configuration and inferred interparticle forces at different sample stresses were used to construct spring networks characterized by Hessian and damping matrices. The ultrasound responses of these network were simulated to investigate the origi

SUBMITTER: Zhai C 

PROVIDER: S-EPMC7368278 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature