Bulletin of the American Physical Society
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 62, Number 9
Sunday–Friday, July 9–14, 2017; St. Louis, Missouri
Session D6: Ballistics I |
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Chair: James Walker, SWRI Room: Regency Ballroom E |
Monday, July 10, 2017 2:00PM - 2:15PM |
D6.00001: ABSTRACT WITHDRAWN |
Monday, July 10, 2017 2:15PM - 2:30PM |
D6.00002: A ballistic performance study on multiphase particulate systems impacted by various projectiles Christian Comtois-Arnaldo, Oren Petel The present study investigates the complex multiscale dynamic response of particulate composites, in an effort to link the bulk material behavior to strain-rate activated microstructures. These investigations involve multiphase systems containing micron-sized ceramic particles integrated into a siloxane elastomer to create flexible nanocomposites with varying inclusion properties. In particular, the effects of varying particle morphology, strength, volume fraction, and density are under investigation. The experimental focus of the study concerns the ballistic penetration of the nanocomposite targets. The targets are impacted by fragment simulating steel projectiles of constant mass and varying nose shapes (i.e., flat, ogive, and chisel-nose) to identify variations in the penetration mechanics. The projectiles are accelerated in a single-stage gas gun to velocities ranging from 200 m/s to 900 m/s prior to impact. The results for each projectile type are compared to analytical penetration models in order to shed light on the dominant penetration mechanisms and their relationship to the microstructure of the nanocomposites. [Preview Abstract] |
Monday, July 10, 2017 2:30PM - 3:00PM |
D6.00003: Projectile Penetration into Sand Targets. Invited Speaker: John Borg With novel in-situ experimental measurement techniques, highly resolved qualitative observations and quantitative measurements of dynamic events within granular media can be made. 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. High speed photography was used to capture the event. 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. These transmitted stress profiles were compared with the DIC records. 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] |
Monday, July 10, 2017 3:00PM - 3:15PM |
D6.00004: Characterization of Hypervelocity Metal Fragments for Explosive Initiation John Yeager, Patrick Bowden, Daniel Guildenbecher, Joseph Olles The off-normal detonation behavior of two plastic-bonded explosive (PBX) formulations was studied using explosively-driven aluminum fragments moving at hypersonic velocity. Witness plate materials, including copper and polycarbonate, were used to characterize the distribution of particles, finding that the aluminum did not fragment homogeneously but rather with larger particles in a ring surrounding finer particles. Digital holography experiments were conducted to measure three-dimensional shape and size of the fastest-moving fragments, which ranged between 100 and 700 microns and traveled between 2 and 3.5 km/s. Crucially, these experiments showed variability in the fragmentation in terms of the number of fragments at the leading edge of the fragment field, indicating that both single and multiple shock impacts could be imparted to the target material. Lower density PBX 9407 (RDX-based) was initiable at up to 4.5 inches, while higher density PBX 9501 (HMX-based) was only initiable at up to 0.25 inches. This type of data is critical for safety experiments and hydrocode simulations to quantify shock-to-detonation transition mechanisms and the associated risk-margins for these materials. [Preview Abstract] |
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