Article
Materials Science, Multidisciplinary
K. Katagiri, N. Ozaki, D. Murayama, K. Nonaka, Y. Hironaka, Y. Inubushi, K. Miyanishi, H. Nakamura, T. Okuchi, T. Sano, Y. Seto, K. Shigemori, K. Sueda, T. Togashi, Y. Umeda, M. Yabashi, T. Yabuuchi, R. Kodama
Summary: The Hugoniot equation-of-state, Gruneisen parameter, and structure of laser-shocked polyimide were measured. The results showed that the polyimide has a low melting pressure and rapid melting kinetics.
Article
Physics, Applied
Rachel C. Huber, Erik B. Watkins, Dana M. Dattelbaum, Brian D. Bartram, Lloyd L. Gibson, Richard L. Gustavsen
Summary: Polymers undergo phase transformations and structural changes under extreme conditions, with velocimetry and X-ray diffraction being commonly used experimental techniques. Observations in experiments on HDPE showed polymer chain compression, crystal structure reorientation, and potential phase changes or chemical decomposition at high pressures.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Mechanical
B. X. Bie, R. C. Pan, J. Xu, H. W. Chai, S. Chen, G. H. Du, Y. L. Bian, Y. Cai, S. N. Luo
Summary: Plate impact experiments were conducted to investigate the shock compression and spallation properties of PEEK. The study obtained the Hugoniot equation of state and the shock-state Lagrangian sound velocity of PEEK through reverse impact. It was found that the spallation of PEEK exhibited a two-stage behavior and the fracture toughness decreased with increasing impact velocity, likely due to the rearrangement and breakage of molecular chains.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Geochemistry & Geophysics
E. J. Davies, M. S. Duncan, S. Root, R. G. Kraus, D. K. Spaulding, S. B. Jacobsen, S. T. Stewart
Summary: Physical processes during planet formation involve a wide range of pressures and temperatures, with giant impacts reaching high pressures and generating sufficient entropy. Shock experiments on forsterite were conducted to determine density and temperature, revealing discrepancies with previous equation of state models. Experimental results suggest past impact studies may have underestimated vapor production and support the idea of giant impacts transforming mantles of rocky planets into supercritical fluids.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Mechanics
Sergey G. Chefranov
Summary: The linear instability conditions for a converging cylindrical shock wave in an arbitrary inviscid medium have been examined. By analyzing the most unstable small dimensionless wave numbers, the influence of perturbations on the shape of the shock wave front and the cumulation of internal energy was discussed. The correspondence of this theory to experimental and simulation data on underwater electrical explosion was also considered.
Article
Chemistry, Applied
Marc J. Cawkwell, Milovan Zecevic, Darby J. Luscher, Kyle J. Ramos
Summary: Complete equations of state for the volumetric deformation of beta-HMX have been derived from its Helmholtz free energy, with dispersion-corrected density functional theory calculations used to compute normal mode frequencies. The calculated frequencies were used to generate tabular and approximate models for the equations of state, both based on a set of Debye models. The resulting equations were applied to calculate the thermophysical properties of beta-HMX and compared in detail.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2021)
Article
Physics, Fluids & Plasmas
J. F. Ong, P. Ghenuche, I. C. Edmond Turcu, A. Pukhov, K. A. Tanaka
Summary: We demonstrate the generation of an ultra-high-pressure plasma through the irradiation of a laser on an aligned nanowire. This plasma becomes relativistically transparent and compressed longitudinally by the oscillating component of the ponderomotive force. The maximum pressure reached is 40 Tbar, which is 5 times higher than the z-pinch pressure.
Article
Thermodynamics
A. E. Gheribi, J. J. Lee
Summary: The application of a Calculation of Phase Diagrams (CALPHAD) method to perform thermochemical equilibrium calculations of Chapman-Jouguet (CJ) detonation properties for new reactive mixtures is described in this study. The investigated mixtures include titanium-silicon (Ti-Si), aluminum-iron oxide (Al-Fe2O3), and zinc-sulfur (Zn-S). The results indicate that the high-pressure products of these mixtures are stable and suitable for gasless CJ detonation calculations. The CJ calculation method is successful for these mixtures, showing high temperatures but limited volume increase in the detonation properties. Gasless detonation may be possible under certain narrow conditions.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Shamal L. Chinke, Inderpal S. Sandhu, Prashant S. Alegaonkar
Summary: The study investigates the impact of simulated blast waves on the shock damping characteristics of porous nano-carbon material, revealing its elasto-plastic behavior, fatigue parameters, and hydrodynamic interactions between pressure, volume, shock, and particle velocity. The findings suggest a reduction in sound speed during shock states and demonstrate the material's response to high impact velocities through changes in topological disorder and thickness. The analysis provides insights into the behavior and properties of the material under extreme conditions.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Crystallography
Yuntian Wang, Xiangguo Zeng, Huayan Chen, Xin Yang, Fang Wang, Jun Ding
Summary: This study developed a micromechanical approach to determine the Mie-Gruneisen EOS parameters of iron under Hugoniot states. The differences between single-crystal and nanocrystalline iron under high pressures were found to be insignificant, with slight variations in results calculated using different potentials.
Article
Engineering, Mechanical
Y. L. Bian, H. W. Chai, S. J. Ye, H. L. Xie, X. H. Yao, Y. Cai
Summary: The study reveals that polyethylene terephthalate exhibits varying spallation properties and tensile strain rates at different impact velocities. Through plate impact experiments and X-ray computed tomography, the behavior and structures of the material under different shock pressures are unveiled.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Physics, Multidisciplinary
Leonid Burakovsky, Dean L. Preston, Scott D. D. Ramsey, Charles E. E. Starrett, Roy S. S. Baty
Summary: Although copper and silver are polymorphic materials, they are reliable Hugoniot standards. This study presents an accurate analytic model of their principal Hugoniots, as well as those of iridium and platinum, over a wide range of pressures. The comparison with experimental and theoretical data demonstrates excellent agreement, making the new model a reliable standard for copper and silver.
MATTER AND RADIATION AT EXTREMES
(2023)
Article
Physics, Applied
Raymond F. Smith, Vinay Rastogi, Amy E. Lazicki, Martin G. Gorman, Richard Briggs, Amy L. Coleman, Carol Davis, Saransh Singh, David McGonegle, Samantha M. Clarke, Travis Volz, Trevor Hutchinson, Christopher McGuire, Dayne E. Fratanduono, Damian C. Swift, Eric Folsom, Cynthia A. Bolme, Arianna E. Gleason, Federica Coppari, Hae Ja Lee, Bob Nagler, Eric Cunningham, Philip Heimann, Richard G. Kraus, Robert E. Rudd, Thomas S. Duffy, Jon H. Eggert, June K. Wicks
Summary: Combining an x-ray free electron laser with a high-power laser driver allows for the study of equations-of-state, high strain-rate deformation processes, structural phase transitions, and transformation pathways under high pressure conditions. The results of shock compression and x-ray diffraction experiments on slurry targets provide valuable insights into the properties of embedded grains.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Sergei Manzhos, Manabu Ihara
Summary: Kernel-based methods, such as Gaussian process regression (GPR), are widely used in computational chemistry for fitting potential energy surfaces in high-dimensional spaces. This study shows the disappearance of the locality property of Gaussian-like kernels in high dimensionality, which has a significant impact on the regression quality. Additionally, a multi-zeta approach to the kernel is formulated and found to improve regression in low dimensionality but not in high dimensionality due to the loss of locality property.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Mohammed Shihab, Yasmine Adel, Nabil M. El-Siragy
Summary: This study investigated the interaction dynamics of extremely short and high-intensity X-ray pulses with a 1.0 μm thick Al foil. The results show that probe pulses significantly heat the target and create a two-temperature system in the electron distribution. This research provides insights into the effects of X-ray pulses on target materials and the generation of hot dense matter.
RESULTS IN PHYSICS
(2021)
