Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session E02: Impact Mitigation IRecordings Available
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Chair: Frederick Ouellet, Los Alamos National Laboratory Room: Anaheim Marriott Platinum 6 |
Monday, July 11, 2022 2:00PM - 2:15PM |
E02.00001: Zr-based bulk metallic glasses equation of state under laser shock compression and spall strengths. Yoann Raffray, Benjamin Jodar, Jean-Christophe Sangleboeuf, Alessandra Benuzzi Mounaix, Tommaso Vinci, Laurent Berthe, Emilien Lescoute, Etienne Barraud, Erik Brambrink, Didier Loison Due to the constant augmentation of small sizes space debris (≈ 1 mm), innovative materials to replace the actual space structure shields are of great interest. Hoffman et al. studies (2015) highlight the efficiency of bulk metallic glasses (BMG) as shielding components with hypervelocity impacts experiments on a Whipple shield configuration. In this work, we are focusing on the dynamic mechanical properties of two compositions of Zr-based BMG, Zr50Cu40Al10 and Zr60Cu30Al10, that have already shown interesting properties in quasi-static domain (high elasticity, low density, high tenacity, and high fracture threshold). Laser shock experiments have been conducted at LULI2000 and HERA facilities (FRANCE) to reach extreme conditions with high pressures and high strain rates. In-situ diagnosis like VISAR interferometer and line-imaging velocimeter, allow us to establish the equation of state (HUGONIOT curve) of our two compositions in the pressure range up to 75 GPa and 90 GPa respectively, and also to determine spall strengths, up to 13.8 GPa, for the highest strain rate. Our results (EOS and spall strength) are compared to those of the literature obtained by plate impact. |
Monday, July 11, 2022 2:15PM - 2:30PM |
E02.00002: Numerical Investigation of a High Explosive Response to a Fragment Impact Bertrand Rollin, Jennifer J Ressler The High Explosive Response to MEchanical Stimulus model, HERMES, was designed to predict the response of explosive materials and propellants to mechanical insults. Developed to address safety concerns, it is also a useful tool to investigate complex explosive processes as it combines material constituent models such as stress, deformation, and porosity with reactive rate laws. HERMES can capture the response of explosive materials under conditions of Shock to Detonation Transition (SDT), Deflagration to Detonation Transition (DDT) and Unknown to Detonation Transition (XDT). A detailed understanding of these processes is critical for safety assessments. In particular, fragments impacting an explosive are a concern as they may cause a detonation, either prompt or delayed. Further, if the explosive confinement is weak or opened, a shock wave produced by propelled unreacted material striking a nearby solid surface may induce the detonation of the remaining explosive undamaged by the fragment. We present a parametric study of the response of a slab of HMX-based explosive LX-14 to a fragment impact. Size, speed, and shape of the fragment are the variables of interest while we seek to characterize the realization of detonation under the processes of SDT and DDT. A steel back plate is added to our original setup to investigate XDT. In this new configuration, the distance between the back plate and the HE slab becomes an additional control parameter.
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Monday, July 11, 2022 2:30PM - 2:45PM |
E02.00003: Modeling and Experimental Results for Ceramic Insensitive Munitions Fragment Impact Barriers Kevin Miers, Daniel L Prillaman, Nausheen M Al-Shehab, Eric A Lynd The U.S. Army DEVCOM Armaments Center at Picatinny Arsenal, NJ is working to develop technologies to mitigate the violent reaction of various munitions when subjected to the NATO Insensitive Munitions Fragment Impact (FI) test. As per NATO AOP 4496, FI testing is conducted at 2530±90 m/s with a 14.3mm diameter, L/D~1, 160˚ conical nosed mild steel fragment. Depending on the munition item of interest, packaging barriers are often required in tandem with less sensitive energetics to fully mitigate this threat. Both the extremely strong initial input shock and the subsequent penetration mechanics must be addressed, requiring barrier designs that provide enhanced fragment breakup and velocity reduction. Packaging barriers must ideally be lightweight, inexpensive, and able to withstand applicable environmental and rough handling conditions. As a result advanced lightweight armor materials have been of recent interest. Ceramics in particular have pressure dependent strength and can provide significantly enhanced protection. Hydrocode modeling was performed to identify ceramic barriers which provided improved performance compared to simple metallic designs. These configurations were tested at the GD-OTS Rock Hill test facility, and good agreement with modeling predictions was observed. |
Monday, July 11, 2022 2:45PM - 3:00PM |
E02.00004: Extending the Asay window measurement model to high areal mass shock experiments Daniel J Champion, Sean R Breckling, Paul T Steele, Fady M Najjar, Garry R Maskaly An improved analysis technique for the measurement of accumulated mass during an ejecta producing shock physics experiment using the Asay window technique is employed and derived by considering the combined window material and accumulating mass deposits as a variable mass system. The improved technique introduces an accretion layer component to the analysis that consists of the accumulating surface deposits and includes considerations of this layer in the variable mass system. The general formulation for the balance of linear momentum allows for the derivation of equations of motions for the combined accretion layer and window material variable mass system in terms of experiment observables. Dynamic time delays that can occur in dual layer (embedded reflector) Asay windows are accounted for in this method, and accumulated mass and volumetric density are recovered from velocimetry data using an iterative integration technique. The result of these improvements in the analysis of Asay windows provides for the accurate extension of accumulated mass and volumetric density measurements through the period of bulk material arrival at the window and permits comparisons with radiography. |
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