Bulletin of the American Physical Society
18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter held in conjunction with the 24th Biennial Intl. Conference of the Intl. Association for the Advancement of High Pressure Science and Technology (AIRAPT)
Volume 58, Number 7
Sunday–Friday, July 7–12, 2013; Seattle, Washington
Session Z1: ME.5 Ballistics II |
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Room: Grand Ballroom I |
Friday, July 12, 2013 11:00AM - 11:30AM |
Z1.00001: Compression, Release, and Fracture in Glass During Ballistic Impact Invited Speaker: Michael Zellner On hold due to security. Contact David Moore for details. [Preview Abstract] |
Friday, July 12, 2013 11:30AM - 11:45AM |
Z1.00002: Measurement of Damage Velocities in Bullet Impacts of Transparent Armor Charles Anderson, Rory Bigger, Carl Weiss A series of impact experiments have been conducted to examine the response of transparent material to ballistic impact. The experiments consisted of impacting 15 mm of borosilicate glass back by 9.5 mm of Lexan. The projectile was a 0.30-cal hard steel bullet designed specifically for the experiments. Residual velocities and the residual length of the bullets (which were soft-recovered in a catch box) were measured as a function of impact velocity. High-speed imaging of the impact event and post-test analysis has permitted quantification of damage propagation and the rate of propagation. The results of several experiments are presented and compared to edge-on impact experiments that have been conducted by Strassburger et al [1].\\[4pt] [1] E. Strassburger, M. Hunzinger, J. W. McCauley and P. Patel, ``Experimental methods for characterization and evaluation of transparent armor materials,'' Advances in Ceramic Armor VI, Ceramic Engng. {\&} Sci. Proc., Vol. 31(5): 183-198 (2010). [Preview Abstract] |
Friday, July 12, 2013 11:45AM - 12:00PM |
Z1.00003: On the ballistic response of comminuted ceramics Amer Hameed, Gareth Appleby-Thomas, Paul Hazell, David Wood Recent results have strongly suggested that the ballistic-resistance of different comminuted ceramics is similar, independent of the original strength of the material. In particular, experimental work focused on the ballistic response of such materials has suggested that ballistic response is largely controlled by shattered material morphology. Consequently, it has been postulated that control of the nature of ceramic fragmentation should provide a potential route to optimise post-impact ballistic resistance. In particular, such an approach would open up a route to control in multi-hit capabilities. In this study ballistic tests into pre-formed ``fragmented-ceramic'' analogues assembled from compacted alumina powders with two differing morphologies were conducted. These results strongly suggested that careful choice of initial ceramic morphology should provide a route to tailor post-impact ceramic properties. [Preview Abstract] |
Friday, July 12, 2013 12:00PM - 12:15PM |
Z1.00004: Influence of cavitator shape on projectile penetration process in soil media Anna Daurskikh, Vladislav Veldanov Standoff pins (cavitators) with smaller diameter than the projectile can be used to reduce the drag during the motion in soil media due to formation of a cavity. Cavity geometry is defined by the cavitator shape, its material and impact conditions. Combination of these factors was investigated numerically, and influence of the cavitator shape on the projectile deceleration was studied. In particular, velocities up to 1000 m/s and different angles of attack were considered. Features of projectile stability and its interaction with the walls of the cavity were examined. Additionally, experimental investigations were carried out. [Preview Abstract] |
Friday, July 12, 2013 12:15PM - 12:30PM |
Z1.00005: Modeling the fragmentation of hypervelocity impacts on a two wall shield Joshua Miller, Eric Christiansen Two wall spacecraft shields are a mass efficient method for countering the risk of solid particle environments for systems operating in space. In this approach the threat encounters the first of two walls and shock wave compresses upon impact. The compression heats the materials so that upon subsequent release the materials spread out over a much larger region than the initial threat making it much more likely that a subsequent wall can arrest the impact energy. It is of great importance in system survivability assessments to accurately model this process and to develop models that reasonably describe a broad range of materials and impact conditions. To this end an experimental effort with spherical projectiles of a range of materials has been conducted to greater than 10 km/s and augmented to a much broader range of impact conditions by impact simulations. From this effort a modeling approach has been developed that captures this process for use in survivability assessments. The model and its anchoring data are discussed here. [Preview Abstract] |
Friday, July 12, 2013 12:30PM - 12:45PM |
Z1.00006: Optimum Structure of Whipple Shield against Hypervelocity Impact Minhyung Lee It has been known that the spacecraft protection issues against space debris or meteoroid impact damage are of great importance. Whipple shield structures (double spaced plates) have been investigated and empirical ballistic limit curve (BLCs) are developed. In this paper, we like to investigate an optimum Whipple Shield structure of fixed areal density and space. To do this, a new in-house SPH code has been used. Last 20 years SPH (Smoothed Particle Hydrodynamics) numerical scheme has been widely applied to the hypervelocity impact problems because of the limited velocity range and cost of test. We first examined the extent of debris spreading which seems to be a key factor to the back plate impact. The debris cloud expansion angle shows a maximum value. Then, a series of hypervelocity impact simulations were conducted to predict the critical impacting sphere diameter. It has been found that there is an optimum thickness ratio of front bumper to real wall. [Preview Abstract] |
Friday, July 12, 2013 12:45PM - 1:00PM |
Z1.00007: Perforation of Thin Aluminum Alloy Plates by Blunt Projectiles - Experimental and Numerical Investigation Gang Wei, Wei Zhang Reducing the armor weight has become a research focus in terms of armored material with the increasing requirement of the mobility and flexibility of tanks and armored vehicles in modern local wars. Due to high strength-to-density ratio, aluminum alloy has become a potential light armored material. In this study, both lab-scale ballistic test and finite element simulation were adopted to examine the ballistic resistance of aluminum alloy targets. Blunt high strength steel projectiles with 12.7 mm diameter were launched by light gas gun against 3.3 mm thick aluminum alloy plates at velocity of 90 $\sim$ 170 m/s. The ballistic limit velocity was obtained. Plugging failure and obvious structure deformation of targets were observed, and with the impact velocity increasing, the target structure deformation decrease gradually. Corresponding 2D finite element simulations were conducted by ABAQUS/EXPLICIT combined with material performance testing. Good agreement between the numerical simulations and the experimental results was found. [Preview Abstract] |
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