Particle-level modeling of dynamic consolidation of Ti-SiC powders

Tong, Wei; Ravichandran, G.

doi:10.1088/0965-0393/3/6/003

Cited by 27 publications

(16 citation statements)

References 31 publications

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“…The calculations were used to evaluate the changes in porosity as the shock wave propagates. Impact compression of other materials systems has been investigated, including aluminium and iron oxide mixtures (Austin et al 2006), granular sugar (Trott et al 2007) and Ti/SiC powders (Benson et al 1995). Most of the simulations do not show the high temperature rises to be at levels required for ignition, despite experimental evidence pointing to the contrary (Idar et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

2012

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The effect of transient stress waves on the microstructure of HMX-Estane, a polymerbonded explosive (PBX), is studied. Calculations carried out concern microstructures with HMX grain sizes on the order of 200 mm and grain volume fractions in the range of 0.50-0.82. The microstructural samples analysed have an aspect ratio of 5 : 1 (15 × 3 mm), allowing the transient wave propagation process resulting from normal impact to be resolved. Boundary loading is effected by the imposition of impact face velocities of 50-200 m s −1 . Different levels of grain-binder interface strength are considered. The analysis uses a recently developed cohesive finite element framework that accounts for coupled thermal-mechanical processes involving deformation, heat generation and conduction, failure in the forms of microcracks in both bulk constituents and along grain/matrix interfaces, and frictional heating along crack faces. Results show that the overall wave speed through the microstructures depends on both the grain volume fraction and interface bonding strength between the constituents and that the distance traversed by the stress wave before the initiation of frictional dissipation is independent of the grain volume fraction but increases with impact velocity. Energy dissipated per unit volume owing to fracture is highest near the impact surface and deceases to zero at the stress wavefront. On the other hand, the peak temperature rises are noted to occur approximately 2-3 mm from the impact surface. Scaling laws are developed for the maximum dissipation rate and the highest temperature rise as functions of impact velocity, grain volume fraction and grain-binder interfacial bonding strength.

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Section: Introductionmentioning

confidence: 99%

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

2012

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“…[9][10][11] Modeling of the shock-compression of granular systems has been performed by a number of investigators. [12][13][14][15][16][17][18][19][20][21][22] However, still several questions remain unanswered. Some of these include the following.…”

Section: Introductionmentioning

confidence: 99%

Discrete particle simulation of shock wave propagation in a binary Ni+Al powder mixture

Eakins

Thadhani

2007

Journal of Applied Physics

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Numerical simulations of shock wave propagation through discretely represented powder mixtures were performed to investigate the characteristics of deformation and mixing in the Ni+ Al system. The initial particle arrangements and morphologies were imported from experimentally obtained micrographs of powder mixtures pressed at densities in the range of 45%-80% of the theoretical maximum density ͑TMD͒. Simulations were performed using these imported micrographs for each density compact subjected to driver velocities ͑U p ͒ of 0.5, 0.75, and 1 km/ s, and the resulting shock velocity ͑U s ͒ was used to construct the U s -U p equation of state. The simulated equation of state for the 60% TMD mixture was validated by matching results obtained from previous gas-gun experiments. The details of shock wave propagation through the Ni+ Al powder mixtures were explored on several scales. It is shown that the shock compression of mixtures of powders of dissimilar densities and strength is associated with heterogeneous deformation processes leading to focused flow, particulation, and vortex formation, resulting in local fluctuations in pressure and temperature, which collectively are responsible for highly irregular "shock" fronts and unstable high-pressure states in granular media.

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“…Shock wave propagation in discrete particles mixtures has been studied at the mesoscale by Benson and co-workers for a range of material systems, e.g., Cu powders, 14,15 HMX, 16 Ti-SiC, 17 and Nb-Si. 18,19 Recently, mesoscopic finite-element models have been developed to enable the study of shock waves in Al/ Fe 2 O 3 / epoxy composite systems.…”

Section: Comparison Of Measured Hugoniot With Finite-element Model Simentioning

confidence: 99%

Equation of state of aluminum-iron oxide-epoxy composite

Jordan

Ferranti

Austin

et al. 2007

Journal of Applied Physics

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We report on the measurements of the shock equation of state (Hugoniot) of an Al∕Fe2O3/epoxy composite, prepared by epoxy cast curing of powder mixtures. Explosive loading, with Baratol, trinitrotoluene (TNT), and Octol, was used for performing experiments at higher pressures, in which case shock velocities were measured in the samples and aluminum, copper, or polymethyl methacrylate (PMMA) donor material, using piezoelectric pins. The explosive loading of the metal donors (aluminum and copper) will be discussed. Gas gun experiments provide complementary lower pressure data in which piezoelectric polyvinylidene fluoride (PVDF) stress gauges were used to measure the input and propagated stress wave profiles in the sample and the corresponding shock propagation velocity. The results of the Hugoniot equation of state are compared with mesoscale finite-element simulations, which show good agreement.

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Particle-level modeling of dynamic consolidation of Ti-SiC powders

Cited by 27 publications

References 31 publications

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

Discrete particle simulation of shock wave propagation in a binary Ni+Al powder mixture

Equation of state of aluminum-iron oxide-epoxy composite

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