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 V5: Inelastic Deformations, Fracture and Spall XII |
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Chair: Robert Rudd, Lawrence Livermore National Laboratory Room: Regency Ballroom B |
Thursday, July 13, 2017 3:45PM - 4:00PM |
V5.00001: Principles underlying the Fourth Power Nature of Structured Shock Waves Dennis Grady Steady structured shock waves in materials including metals, glasses, compounds and solid mixtures, when represented through plots of Hugoniot stress against a measure of the strain rate through which the Hugoniot state is achieved, have consistently demonstrated a dependence to the fourth power. A perhaps deeper observation is that the product of the energy dissipated through the transition to the Hugoniot state and the time duration of the Hugoniot state event exhibits invariance independent of the Hugoniot amplitude. Invariance of the energy-time product and the fourth-power trend are to first order equivalent. Further, constancy of this energy-time product is observed in other dynamic critical state failure events including spall fracture, dynamic compaction and adiabatic shear failure. The presentation pursues the necessary background exposing the foregoing shock physics observations and explores possible statistical physics principals that may underlie the collective dynamic observations. [Preview Abstract] |
Thursday, July 13, 2017 4:00PM - 4:15PM |
V5.00002: Shock waves and quantum limited transport Roger Minich Universal transport in strongly coupled systems with viscosity to entropy density ratios approaching a minimum value will affect the shape of a stationary shock. The rate of heat transport cannot be arbitrarily large, but is limited by universal quantum limited transport. This limits the rise time of the shock and determines the shock structure in general. Scaling laws are developed and compared with experiment. A comparison between the derived scaling laws and experiment over a wide range of rise times from microseconds to picoseconds in the case of the ultrafast laser driven shocks. The relationship toAdS/CFT duality is also discussed. [Preview Abstract] |
Thursday, July 13, 2017 4:15PM - 4:30PM |
V5.00003: Phenomenological Mechanochemistry of Damage in Electromagnetic Fields Michael Grinfeld, Pavel Grinfeld Basic principles of Phenomenological Mechanochemistry of Damage (PMD) have been formulated in Grinfeld and Wright [1]. To some extent, it is a natural extension of the traditional damage theory, presented by Kachanov [2]. Contrary to Kachanov's approach, the PMD theory includes, in addition to the bulk elastic energy, the energy associated with braking/recovery of chemical bonds. Therefore, in addition to the elasticity equations it includes the equation, describing evolution/dynamics of chemical bonds. Although ``chemical bonds'' is a nano-scale concept, we treat the bonds using phenomenological approach. The additional equation of damage evolution is of the rate type, thus, making the whole model rate-dependent (even in quasi-static approach.) In the paper, we review some earlier results and generalized them by taking into account electromagnetic effects. \begin{enumerate} \item Grinfeld, MA., Wright, TW. Thermodynamics of solids: recent progress with applications to brittle fracture and nanotechnology. Paper presented at 23rd U.S. Army Science Conference; 2002; Orlando (FL). \item Kachanov, LM. Introduction to continuum damage mechanics. Dordrecht: (Netherlands): Martinus Nijhoff Publishers;1986. \end{enumerate} [Preview Abstract] |
(Author Not Attending)
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V5.00004: Fourth-power law structure of the shock wave fronts in metals and ceramics Yuriy Bayandin, Oleg Naimark, Natalia Saveleva The plate impact experiments were performed for solids during last fifty years. It was established that the dependence between the strain rate and the shock wave amplitude for metals and ceramics expressed by a fourth-power law [1-3]. Present study is focused on the theoretical investigation and numerical simulation of plane shock wave propagation in metals and ceramics. Statistically based constitutive model of solid with defects (microcracks and microshears) was developed to provide the relation between damage induced mechanisms of structural relaxation, thermally activated plastic flow and material reactions for extreme loading conditions. Original approach based on the wide range constitutive equations was proposed for the numerical simulation of multiscale damage-failure transition mechanisms and plane shock wave propagation in solids with defects in the range of strain rate $10^{3}-10^{8} s^{-1}$. It was shown that mechanisms of plastic relaxation and damage-failure transitions are linked to the multiscale kinetics of defects leading to the self-similar nature of shock wave fronts in metals and ceramics. [1] Barker L.M. Behavior of dense media under high dynamic pressures. N.Y. 1968. [2] Swegle J.W \& Grady D.E. J.Appl.Phys. 1985. 58. [3] Grady D.E. J.Appl. Phys. 2010. 107. [Preview Abstract] |
Thursday, July 13, 2017 4:45PM - 5:00PM |
V5.00005: Dynamic failure of high energy materials under compression and periodic excitation Marisol Koslowski, Nicolo Grilli, Bogdan Tanasoiu, Camilo Duarte Cordon Polymer bonded explosives consist of high energetic particles in a polymeric binder. When these composites are subjected to heat, impact, friction, shock, or other initiation stimulus, they undergo a rapid chemical change. The sensitivity to initiation depends not only on the amount of energy available in the system but also on the rate at which available energy is released. Therefore, it is of extreme importance to predict the dissipated energy and its rate due to mechanical insults from accurate predictions of the deformation fields including localization, fracture and plasticity. The focus of this work is to study energy dissipation due to fracture and plasticity in high energy particles embeded in a polymer binder using finite elements. Numerical simulations of crack propagation under compressive load and dynamic excitation are performed with a phase field damage model. A systematic study of the energy release rate and initial microstructure is performed to analyze their repercussion on the dissipated energy and initiation. [Preview Abstract] |
Thursday, July 13, 2017 5:00PM - 5:15PM |
V5.00006: Using Characteristics Method to Infer Sound Speed in Nonsymmetric Impact and Release Experiment Xiaomian Hu, Hao Pan, Zihui Wu Sound speed is important to high velocity impact phenomena because it is used to deduce the shear moduli, strength and phase transition of materials at high pressure. Historically the sound speed analysis methods cannot infer the right results from the velocity-time history of a windowed-surface in the nonsymmetric impact and release experiment due to impedance mismatch between a flyer, sample and window. A characteristics method has been modified to account for the effect of the flyer/sample and sample/window interactions, thus it can be applied to the nonsymmetric impact and release experiment with only one depth of material. Synthetic analyses of the nonsymmetric impact suggest that this method can give accurate results including sound speed-particle velocity and release path at high pressure, moreover, this method also do not need to know the form of equations of state (EOS) and constitutive model of the sample.These features facilitate applying this method to infer sound speed from the velocity profile of nonsymmetric impact experiments. [Preview Abstract] |
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