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 L04: Dynamic Properties of Complex MaterialsFocus Recordings Available
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Chair: Leslie Lamberson, Colorado School of Mines Room: Anaheim Marriott Platinum 2 |
Tuesday, July 12, 2022 2:00PM - 2:30PM |
L04.00001: Exposing Inert Solid Rocket Propellants to Shock Waves for Viscoelastic Property Characterization Invited Speaker: Sarah Bentil Solid rocket propellants are energetic materials that can be used as fuel in military applications to generate thrust for tactical or strategic rockets and missiles. In the case of solid rocket motors that experience high strain rate conditions (e.g. bullet impact or fragment impact), interfacial debonding of the microscopic solid oxidizer particles in the elastomeric matrix occurs. This debonding manifests as cracks in the solid rocket propellant, which affects the ballistic performance and structural integrity of the propellant. Therefore, designing health-monitoring sensors that can quantify the structural integrity of the solid rocket propellants would be invaluable. However, the predictive capabilities of the health-monitoring sensors require additional research into the viscoelastic behavior of the solid rocket propellant at high strain rates. This talk will highlight a study that couples both shock tube experiments and inverse finite element simulations to quantify the viscoelastic properties of inert solid rocket propellants. Validation of the simulations are performed using the output following digital image correlation analysis. The results from this study will add to the limited knowledge of the linear viscoelastic behavior of inert solid rocket propellants at high strain rates. Thus, aiding in improving the predictive capabilities of health-monitoring sensors for solid rocket propellants. |
Tuesday, July 12, 2022 2:30PM - 2:45PM |
L04.00002: Time-Temperature-Stress Superposition of PBX 9502 Compressive Creep Data for Lifetime Predictions Caitlin S Woznick, Darla G Thompson, Racci DeLuca, Sidney J Scott The plastic-bonded explosive (PBX) 9502 is a viscoelastic, high solids loaded polymer bound composite comprised of 95 weight % (wt%) TATB explosive crystals and 5 wt% FK-800 polymer binder. The uniaxial quasi-static mechanical properties have been studied and characterized extensively over 25+ years, including creep. Creep is the strain evolution over time as a result of an asymmetric load typically at temperatures above ambient. Creep measurements to failure can take excessively long periods of time depending on various factors including applied stress, temperature, and loading rate that render a single test to failure impossible. Using the principles of time-temperature-stress superposition (TTSSP), short-term creep tests at various applied stresses and temperatures can be used for long-term creep predictions. The TTSSP model shifts short-term test data using two factors, one for temperature and stress, creating a master curve at a reference test condition. The master curve can be shifted to predict the creep response at any desired test condition. PBX 9502 compression specimens were tested at three temperatures and various applied stresses. This work discusses the TTSSP analysis of PBX 9502 compressive creep data to create a single comprehensive master curve. |
Tuesday, July 12, 2022 2:45PM - 3:00PM |
L04.00003: Dynamic Response of Additively Manufactured Martensitic Steel to Shock, Spall, and Pressure-Shear Loading Peter A Sable, Bernard Gaskey, David Lacina, Christopher Neel The application of additive manufacturing (AM) to create geometrically intricate components for the tailorable mechanical response of systems has been an area of intense research for more than a decade now, and continues to recieve interest from both the industrial and military communities. However, a comprehensive understanding of the mechanical behavior - particularly in extreme environments - of AM materials remains incomplete and so too does our ability for predictive analysis and design. In the following study, multiple AM variants of the relatively low cost, high strength martensitic steel AF9628 was subjected to a variety of dynamic impact conditions in a effort to observe and understand the resulting mechanical response. Shock, spall, and pressure-shear loading conditions were applied, whereafter Photon Doppler velocimetry and post mortem material analysis was used to quanitfy the thermomechanical behavior in-situ and determine the material Hugoniot, elastic limit, dynamic spall behavior, and high strain rate shear behavior. SEM microscopy was then use to examine microstructural factors during deformation based off of samples specimens soft recovered from experiment. Results serve as a basis for discussion regarding the implication of AM build parameters on munitions relevant material characteristics - like compression strength v. fracture resistance. Complimentary simulations were conducted using the CTH hydrocode in an effort to examine how significant a role characteristics such as porosity play in the thermodynamic response as well as in constitutive behavior. |
Tuesday, July 12, 2022 3:00PM - 3:15PM |
L04.00004: Dynamic mechanical behavior of co-continuous metal composites Lauren L Poole, Saryu J Fensin, Avery F Samuel, Frank W Zok The dynamic mechanical behavior of multiphase metal composites comprising dissimilar immiscible phases can be controlled through selection of constituents, processing routes and phase topologies. Here, we experimentally and computationally investigate a co-continuous tungsten-copper composite that is of interest because both constituents exist in significant fractions and exhibit highly dissimilar properties (CTE, density, yield stress, elastic modulus, crystal structure). Experiments on multiple composite compositions and across several strain rates (quasi-static, Kolsky bar, flyer plate) investigate the interplay of microstructure, strain rate and load state on dynamic mechanical behavior. Additionally, complimentary experiments on single phase tungsten and copper contextualize the bulk mechanical properties and rate sensitivities of the composite in terms of the constituent's responses. |
Tuesday, July 12, 2022 3:15PM - 3:30PM |
L04.00005: Structure / Property (Constitutive and Dynamic Strength / Damage) Characterization of Single-Phase FeAl George T Gray, Saryu J Fensin, David R Jones, Kenneth S Vecchio
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