Collapse dynamics of spherical cavities in a solid under shock loading

Escauriza, Emilio; Duarte, J. Piroto; Chapman, David J.; Rutherford, Michael E.; Farbaniec, Lukasz; Jonsson, J. C. Z.; Smith, L. C.; Olbinado, Margie P.; Skidmore, J.; Foster, P. S.; Ringrose, T. J.; Rack, Alexander; Eakins, Daniel

doi:10.1038/s41598-020-64669-y

Cited by 25 publications

(19 citation statements)

References 60 publications

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“…The simulation results were in good agreement with the experimental results. Additionally, experiments and simulations were performed to analyze the shock-induced pore collapse behaviors of 3-, 4-, and 6-mm-diameter pores in poly(methyl methacrylate) at four different shock strengths [12,13]. For all four shock strengths, the predicted results based on the simulations were in close agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 58%

Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading

Duan

et al. 2021

Propellants Explo Pyrotec

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In this study, similarity analysis and mesoscale simulations were performed to investigate hot spot temperatures in triangular voids inside polymer-bonded explosives (PBXs). We found that there are two different void collapse modes, namely single and double hydrodynamic jet modes. The hot spot temperatures achieved in the double hydrodynamic jet mode are much higher than previous predictions, such as predictions based on circular voids, which agrees with recent experimental observations. Additionally, we verified that void configuration (position and shape) plays a significant role in increasing hot spot tem-peratures, implying that when establishing a mesoscale reaction rate model, it is insufficient to use void volume alone to characterize the impact sensitivity of PBXs. Finally, two semi-empirical analytical expressions are proposed to represent the dependence of hot spot temperature on both the void configuration and shock intensity. The resulting theoretical predictions are in good agreement with the numerically simulated results. Such mesoscale analytical expressions can be used for establishing theoretical mesoscale hot spot ignition rate models in the future.

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Section: Introductionmentioning

confidence: 58%

Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading

Duan

et al. 2021

Propellants Explo Pyrotec

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“…Using the experimental and imaging setups, the pore collapse behavior of the 3 , 4 and 6 diameter pores under low to high speed impact is analyzed. The results from the 17 experiments are presented in detail in the work of Escauriza et al [22]. In the present work, the underlying physics governing the collapse behavior of a pore of given diameter under different loading strengths is studied.…”

Section: Methodsmentioning

confidence: 94%

“…A more comprehensive discussion of the numerical framework is presented in previous work [9,20]. The details of the experimental method and set up are also available in a previous publication [22].…”

Section: Methodsmentioning

confidence: 99%

“…In this section, a brief description of the experimental and imaging set-up used to analyze the shock induced collapse behavior of spherical pores in PMMA is presented. Detailed overview of the experimental methods is presented in the work by Escauriza et al [22].…”

Section: Methodsmentioning

confidence: 99%

“…, generating particle velocities between 0.99 and 2.3 / . With reference to Figure 1(a), which shows the configurations for the experimental and imaging systems: to record the pore deformation under applied loading, a custom indirect ultra-high-speed (UHS) x-ray imaging (XRI) system design was used, the full details of which were given by Escauriza et al [22]. UHS is defined here as > 1 million frames per second (fps).…”

Section: Methodsmentioning

confidence: 99%

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Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments

Kumar

Escauriza

Eakins

et al. 2020

Journal of the Mechanics and Physics of Solids

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Head-to-head comparisons are made between calculations and experimental data on shock-driven pore collapse in the transparent material, poly(methyl methacrylate) (PMMA). Simulations are performed using SCIMITAR3D, an Eulerian sharp-interface multi-material code, while plate impact experiments are visualized using ultra-high speed x-ray imaging. The experiments and simulations are conducted over a wide range of loading conditions; from low strength loading regimes where adiabatic shear banding predominates all the way up to the regime where hydrodynamic pore collapse is expected. PMMA is modeled using an isotropic rate-dependent plasticity model for the deviatoric stress response and a Tillotson equation of state for the pressure. Calculations are primarily done in 2D, to save computational effort, but a limited number of 3D calculations are also performed to assess the differences entailed by the dimensionality. The 2D calculations are in fairly good agreement with the experimental results, for the evolution of pore shape. 3D calculations, while quite computationally intense, indeed produce better agreement with experimental data. The computations also agree well with the experiments in delineating the loading strength at which a transition from the strength-dominated to hydrodynamics-dominated pore collapse occurs. This work provides confidence in the ability of Eulerian, sharp interface computational techniques to correctly represent and understand the mechanics of shock-loaded porous condensed phase materials over a range of loading conditions.

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Phase Contrast X‐Ray Imaging of the Collapse of an Engineered Void in Single‐Crystal HMX

Blum‐Sorensen

Duarte

Drake

et al. 2022

Propellants Explo Pyrotec

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Imaging the collapse of a single void that creates a hot spot initiation site in an otherwise defect‐free explosive is challenging given the spatial and temporal scales involved in explosive systems. This work presents our attempt to examine a single hot spot mode (void collapse) in single‐crystal octahydro‐l,3,5,7‐tetranitro‐l,3,5,7‐tetrazocine (HMX) embedded in Sylgard. The hot spot heating mechanisms involved with pore collapse include adiabatic heating, jetting, and viscoplastic dissipation. Quantifying the dynamics of a pore collapse is a crucial step to understanding which mechanisms dominate during ignition events. Our experiments were conducted with a single‐stage, light‐gas gun at Argonne National Laboratory's Advanced Photon Source, applying the phase contrast imaging technique while collecting high‐speed video. The details of HMX single crystal production, defect (pore) engineering, and sample construction, along with experimental results are presented here. These results demonstrate that detailed collapse dynamics can be obtained from homogeneous, single‐crystal explosives with this approach. Qualitative comparisons are made with simulation data which show good agreement in the transition between a quasi‐symmetric pore collapse and an asymmetric collapse with jetting across the pore as measured with normalized pore area and pore circularity.

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Collapse dynamics of spherical cavities in a solid under shock loading

Cited by 25 publications

References 60 publications

Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading

Influence of Void Configurations on Hot Spot Temperature in PBXs under Impact Loading

Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments

Phase Contrast X‐Ray Imaging of the Collapse of an Engineered Void in Single‐Crystal HMX

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