Bayesian uncertainty analysis is a highly effective tool for estimating model uncertainty, thereby improving the prediction ability with limited data. The data quality plays role in analysis. This paper presents novel approach to assess of experiment high explosives. By assigning varying weights based on their quality, we adopt statistical framework quantify uncertainties associated reactant equation state resulting quantification not only elucidates current physical knowledge but also paves...

The aim of this experiment was to study the plastic response Al dynamic loading at high strain rates. Dynamic applied by direct laser ablation sample with pulse width 3 ns long. free surface velocity histories shock loaded samples, 60-310 μm thick room temperature, and 150 initial temperature from 293 893 K, have been recorded using a line interferometer for any reflections (VISAR) system. VISAR could measure profile temporal resolution (∼100 ps). measured amplitudes elastic precursor waves...

Abstract We present a numerical study of the mechanisms deflagration to detonation transition (DDT) process explosives assess its thermal stability. treated modeling system as mixture solid and gaseous reaction products. utilized one-dimensional two-phase flow approach with space–time conservation element solution (CE/SE) method. Simulation results show that in chemical plug area high density relatively slow reactions preceeds new violent consequent detonation. found steady occurs at regions...

Kelvin-Helmholtz instability on metallic surface is relevant to intense oblique impact in many physical processes such as explosive welding, Inertial Confinement Fusion and planetary events. Evolution of results the formation wavy morphology leading material bonding or even mixing. However, mostly due lack method describe dynamic behavior, mechanism controlled by elastoplastic properties metal remains elusive. Here, we introduce a theory reveal evolution characteristics aroused tangential...

The dynamic responses of cerium under low pressure, including γ →α phase transition, are numerically studied in this paper. velocity profiles shock experiments show that the transition process between two phases is smooth and there no obvious disconnection plastic waves particle profiles. Three important problems response, constitutive model, Hugoniot relation transition/reversal, discussed. A multi-phase equation state model Ce presented paper after analyzing typical wave configuration...

In this paper, a theoretical analysis model is proposed for the linear growth of Richtmyer-Meshkov instability in elastoplastic solid medium-vacuum interface under explosion shock wave loading. The dynamic evolution small perturbations shows that after initial phase inversion, some would stop growing they have reached their maximum amplitude, others continue to grow and then form jetting from solid-vacuum interfaces. Numerical simulations show excellent agreement with experimental results...

In this paper, a stability analysis is given to study the unstable mechanism of Richtmyer-Meshkov flow explosion-driven copper interface. The refers as an interfacial instability growth under shockwave incident loading. Numerical investigations are performed check applicability two-dimensional hydrocode, which named AFE2D, and physical models detonation waves propagating in high explosives, equations state constitutive behaviors solids problems. Here we theoretically analyze two key issues...

A simplified theoretical model for the linear Rayleigh–Taylor instability of finite thickness elastic–plastic solid constantly accelerated by viscous fluid is performed. With irrotational assumption, it possible to consider viscosity, surface tension, elasticity or plasticity effects simultaneously. The considers thicknesses at rigid wall boundary conditions with velocity potentials, and deals transition viscosity based on continuity force equilibrium contact interface. complete analytical...

Dynamic yield strength of metals/alloys depends on loading pressure and rates sensitively. With the development laser interferometer measurement system, extracting information from window/free surface velocity profiles in shock ramp experiments is becoming an important method to investigate materials’ dynamic response under high strain rates. Backwards characteristics analysis (BCAM) can analyze more reasonable because it accounts for bending incoming due impedance mismatch between sample...

Abstract The evolution of shear instability between elastic–plastic solid and ideal fluid which is concerned in oblique impact studied by developing an approximate linear theoretical model. With the velocities expressed velocity potentials from incompressible irrotational continuity equations pressures obtained integrating momentum with arbitrary densities, motion interface amplitude are deduced considering normal force equilibrium perfectly properties at interface. completely analytical...

To understand the plastic deformation mechanism of an FCC metal (pure aluminum) under shock loading and describe its dynamic mechanical behavior accurately, a multiscale constitutive model based on dislocation substructure is developed, which comprehensively considers controlling mechanisms motion evolution. Then, extended to strong waves by incorporating homogeneous nucleated within framework. The parameters are successfully determined normal plate impact experiments with different...

Sound speed is of great importance for high velocity impact phenomena because it a fundamental parameter to deduce the shear moduli, strengths and phase transitions materials at pressure. It has attracted much attention significant challenges experiment simulation. In practice, with development laser interferometer measurement system, one can obtain velocity-time histories windowed-surfaces or free surfaces resolution in shock ramp compression unload experiments. This provides possible way...