Journal ArticleDOI
Simulation of Void Collapse in an Energetic Material, Part I: Inert Case
L. Tran,H. S. Udaykumar +1 more
TLDR
In this article, an Eulerian, sharp interface, fixed Cartesian grid method is applied to study hot-spot formation in an energetic material (HMX) subject to shock loading.Abstract:
An Eulerian, sharp-interface, fixed Cartesian grid method is applied to study hot-spot formation in an energetic material (HMX) subject to shock loading. The mass, momentum, and energy equations are solved along with evolution equations for deviatoric stresses and equivalent plastic strain. Pressure is obtained from the Mie-Griineisen equation of state. The material is modeled as a viscoplastic solid. High-order accurate essentially-nonoscillatory (ENO) shock-capturing schemes along with a particle-level set technique are used to evolve sharp immersed boundaries. The details of void collapse under shock loading and the resulting conversion of mechanical energy into localized regions of high thermal energy (hot spots) in the solid material are analyzed. Insights into the precise mechanisms of initiation sensitivity as a result of hot-spot formation in porous energetic materials are obtained.read more
Citations
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Journal ArticleDOI
Dynamics of void collapse in shocked energetic materials: physics of void–void interactions
Anil Kapahi,H. S. Udaykumar +1 more
TL;DR: In this article, the response of a porous energetic material subjected to severe transient loading conditions was studied in terms of energy distribution and maximum temperature reached in the material in the presence of heterogeneities but in the absence of chemical reactions.
Journal ArticleDOI
Mesoscale simulation of reactive pressed energetic materials under shock loading
Nirmal Kumar Rai,H. S. Udaykumar +1 more
TL;DR: In this paper, the authors used an image to computation approach to perform shock analysis on real microstructures of the energetic samples, such as void size, distribution, and orientation for initiation.
Journal ArticleDOI
High-resolution simulations of cylindrical void collapse in energetic materials: Effect of primary and secondary collapse on initiation thresholds
TL;DR: In this paper, a grid resolution study is presented for a two-dimensional circular void for various shock strengths, and it is found that mesoscale simulations of voids may contain significant predictive uncertainty.
Journal ArticleDOI
Three-dimensional simulations of void collapse in energetic materials
Nirmal Kumar Rai,H. S. Udaykumar +1 more
TL;DR: In this article, the authors studied the dynamics of void collapse and hot spot formation with 3D reactive void collapse simulations for various void shapes and found that dimensionality plays an important role in hot-spot dynamics, underlining the importance of 3D simulations.
Journal ArticleDOI
Collapse of elongated voids in porous energetic materials: Effects of void orientation and aspect ratio on initiation
TL;DR: In this article, the sensitivity of elongated voids in pressed explosives is analyzed with reactive mesoscale simulations, and a strong dependence of the sensitivity on void aspect ratio and elongation is found.
References
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Journal ArticleDOI
Efficient implementation of essentially non-oscillatory shock-capturing schemes,II
Chi-Wang Shu,Stanley Osher +1 more
TL;DR: Two methods of sharpening contact discontinuities-the subcell resolution idea of Harten and the artificial compression idea of Yang, which those authors originally used in the cell average framework-are applied to the current ENO schemes using numerical fluxes and TVD Runge-Kutta time discretizations.
Journal ArticleDOI
Efficient implementation of essentially non-oscillatory shock-capturing schemes, II
ShuChi-Wang,OsherStanley +1 more
TL;DR: This work extends earlier work on the efficient implementation of ENO (essentially non-oscillatory) shock-capturing schemes by providing a new simplified expression for the ENO constructio...
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TL;DR: The physics of the Earth's interior has become a recognized discipline within solid earth geophysics and an important part of the current geophysical literature as discussed by the authors, but until now, there was no self-contained book that provided the background information necessary to understand the widely dispersed and sometimes controversial research about the structure, composition, or temperature of the deep Earth.
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Phenomenological model of shock initiation in heterogeneous explosives
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TL;DR: In this paper, an ignition and growth concept is used, within the framework of a one-dimensional Lagrangian hydrodynamic code, to model the shock initiation of heterogeneous solid explosives.
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Static and Dynamic Pore‐Collapse Relations for Ductile Porous Materials
M. M. Carroll,A. C. Holt +1 more
TL;DR: In this article, the collapse of a hollow sphere of incompressible elastic-plastic material, with appropriate pore radius and over-all porosity, has been analyzed.
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Dynamics of void collapse in shocked energetic materials: physics of void–void interactions
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