Bulletin of the American Physical Society
19th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 60, Number 8
Sunday–Friday, June 14–19, 2015; Tampa, Florida
Session C6: Particulate, Porous and Composite Materials II: Particle Interactions |
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Chair: Greg Kennedy, Georgia Institute of Technology, Merit Schumaker, Marquette University Room: 8/9/10 |
Monday, June 15, 2015 11:15AM - 11:30AM |
C6.00001: Waves in Periodic Dissipative Laminate Metamaterial Generated by Plate Impact Pedro Franco Navarro, David Benson, Vitali Nesterenko Waves generated by plate impact loading of Al/W laminates with different size of cell were investigated numerically depending on the impactor/cell mass ratio. The materials model took into account viscoplastic behavior of materials. It was observed that this mass ratio has a direct impact on the structure of stress pulses traveling through the composite. At the small impactor/cell mass ratio travelling waves closely resembling solitary waves were quickly formed near the impacted surface. They propagate as quasistationary weakly attenuating localized pulses. The properties of these pulses were satisfactory described based on a theoretical model using dispersive and nonlinear parameters of the materials similar to solitary solutions for the Korteweg-de Vries equation (KdV). The temperature at given pressure at the maximum is dramatically different then the temperature corresponding to the shock wave at the same pressure reflecting a different paths of loading. Increase of impactor/cell mass ratio results in the train of solitary like pulses which number increased with the increase of the impactor/cell mass ratio. At large impactor/cell mass ratio oscillatory stationary shock waves were formed. The leading front of these stationary shock waves was closely described by a solitary like pulse observed at small impactor/cell mass ratio. [Preview Abstract] |
Monday, June 15, 2015 11:30AM - 11:45AM |
C6.00002: Strongly Nonlinear Stress Waves in Dissipative Metamaterials Yichao Xu, Vitali Nesterenko We present the measurements, numerical simulations, and theoretical analysis of stress wave propagation in a one-dimensional strongly nonlinear dissipative metamaterial composed of steel disks and Nitrile O-rings. A stress wave of bell shape is generated by impactor with different masses. A strongly nonlinear double power-law is used to describe the nonlinear viscoelastic force interaction between the disks due to the compression of rubber O-rings. Numerical modeling including a nonlinear dissipative term is developed to predict the wave shape and propagation speed. The shape of generated stress wave can be dramatically changed by the viscous dissipation, which may prevent the pulse from splitting into trains of solitary waves. This strongly nonlinear dissipative metamaterial has a potential for attenuation of dynamic loading and allows an enhanced tunability of signal speed. [Preview Abstract] |
Monday, June 15, 2015 11:45AM - 12:15PM |
C6.00003: Real-time Visualization of Dynamic Particle Contact Failures Invited Speaker: Wayne Chen Granular materials have been widely used for shock isolation and ballistic protection. Particles constituting granular materials come under dynamic compressive loading during projectile penetration, materials processing, transportation, and construction. The resulting integrity of the spherical particles plays a significant role in both the subsequent processing and the energy absorption capabilities of the material. In this study, failure mechanisms in two contacting brittle particles under dynamic compressive loading are investigated using high speed X-ray phase contrast imaging. Controlled dynamic compression is applied using a modified Kolsky bar apparatus. Particles investigated in study are composed of five different materials: soda-lime glass (SLG), polycrystalline silicon, polycrystalline silicon dioxide (silica), barium titanate glass (BTG), and yttria stabilized zirconia (YSZ). For both SLG and silica particles, one of the particles pulverize, thus breaking into many small pieces, when compressed. For Silicon and BTG particles, a finite number of cracks are observed in one of the particles causing it to fracture. For YSZ particles, a single meridonial crack develops in one of the particles, breaking it into two parts. [Preview Abstract] |
Monday, June 15, 2015 12:15PM - 12:30PM |
C6.00004: In situ Characterization of Projectile Penetration into Sand Targets John Borg, Peter Sable This work presents the results from dynamic penetration experiments in which long rod projectiles were launched between a velocity range from 35 m/s to 350 m/s into a visually accessible sand target. Stress measurements of the transmitted waveforms were simultaneously collected from a piezoelectric load cells buried in the sand at various locations relative to the shot line. Image correlations were used to extract velocity fields from the photographic record and correlated to the transmitted stress wave profiles. Simulations were used to better understand the dynamic fracture of grains in the near nose region of the projectile. Together these experimental and simulated results further our understanding of high speed granular penetration events. [Preview Abstract] |
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