Cylindrically symmetric SPH simulations of hypervelocity impacts on thin plates

Hayhurst, Colin J.; Clegg, Richard A.

doi:10.1016/s0734-743x(97)87505-7

Cited by 109 publications

(61 citation statements)

References 9 publications

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“…Therefore, the closeness of numerical results with the experimental ones presented in (Hayhurst and Clegg, 1997) proved the effectiveness and accuracy of the presented SPH method in solution of the problems with high speeds and large deformations.…”

Section: Numerical Results and Discussionsupporting

confidence: 61%

“…Numerical verification An Explosive Formed Projectile (EFP) could be formed after detonation of a shaped charge with a spherical-segment liner; here, the EFP was simplified as a metal sphere with a high speed. Hence, a validation model of a sphere impacting a plate was developed according to the description in (Hayhurst and Clegg, 1997), and its numerical results were compared with experimental data in order to verify the effectiveness of the modified SPH method. The comparison of results at about 6 μs is illustrated in Fig.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Application of Smoothed Particle Hydrodynamics in analysis of shaped-charge jet penetration caused by underwater explosion

et al. 2017

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Section: Numerical Results and Discussionsupporting

confidence: 61%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Application of Smoothed Particle Hydrodynamics in analysis of shaped-charge jet penetration caused by underwater explosion

et al. 2017

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“…Simulations were performed with the AUTODYN hydro-code (Hayhurst & Clegg 1997). A simple Lagrangian, 2-D half-space model was set up, using 20 cells across the projectile's radius.…”

Section: Impact Strengthmentioning

confidence: 99%

Survival of the impactor during hypervelocity collisions – I. An analogue for low porosity targets

Avdellidou¹,

Price²,

Delbò³

et al. 2015

Mon. Not. R. Astron. Soc.

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Recent observations of asteroidal surfaces indicate the presence of materials that do not match the bulk lithology of the body. A possible explanation for the presence of these exogenous materials is that they are products of inter-asteroid impacts in the Main Belt, and thus interest has increased in understanding the fate of the projectile during hypervelocity impacts. In order to gain insight into the fate of impactor we have carried out a laboratory programme, covering the velocity range of 0.38 -3.50 km/s, devoted to measuring the survivability, fragmentation and final state of the impactor. Forsterite olivine and synthetic basalt projectiles were fired onto low porosity (<10%) pure water-ice targets using the University of Kent's Light Gas Gun (LGG). We developed a novel method to identify impactor fragments which were found in ejecta and implanted into the target. We applied astronomical photometry techniques, using the SOURCE EXTRACTOR software, to automatically measure the dimensions of thousands of fragments. This procedure enabled us to estimate the implanted mass on the target body, which was found to be a few percent of the initial mass of the impactor. We calculated an order of magnitude difference in the energy density of catastrophic disruption, Q*, between peridot and basalt projectiles. However, we found very similar behaviour of the size frequency distributions for the hypervelocity shots (>1 km/s). After each shot, we examined the largest peridot fragments with Raman spectroscopy and no melt or alteration in the final state of the projectile was observed.

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“…The SPH solver used here has been described by Hayhurst & Clegg (1997) and validated for hypervelocity impacts by Faraud et al (1999) and Price et al (2012). It has been compared to other hydrocodes using a Tillotson equation of state in a study by Pierazzo et al (2008).…”

Section: Sph Simulations and Materials Parametersmentioning

confidence: 99%

A new approach to modelling impacts on rubble pile asteroid simulants

Deller

Lowry

Snodgrass

et al. 2015

Mon. Not. R. Astron. Soc.

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Many asteroids with low bulk densities must have a rubble pile structure and internal voids. Although little is known about their internal structure, numerical simulations of impact events on these asteroids rely on assumptions on how the voids are distributed. We present a new approach to model impacts on rubble pile asteroids that explicitly takes into account their internal structure. The formation of the asteroid is modelled as a rubble pile aggregate of spherical pebbles of different sizes. This aggregate is then converted into a high-resolution smoothed particle hydrodynamics (SPH) model, accounting for macroporosity inside the pebbles. We compare impact-event outcomes for a large set of internal configurations to explore the parameter space of our model-building process. The analysis of the fragment size distribution and the disruption threshold quantifies the specific influence of each input parameter. The size distribution of the pebbles used in our model is a simple power law, containing three free parameters: the slope α, the lower cut-off radius r min and the upper cutoff radius r max . The influence of all three parameters on the outcome is assessed in this paper. The existence of void space in our model increases the resistance against collisional disruption, a behaviour previously reported based on numerical simulations using a continuum description of porous material (Holsapple 2009). We show, for a set of asteroid collisions typical for small asteroids in the main belt, that no a priori knowledge of the exact size distribution of the pebbles inside the asteroid is needed, as the choice of the corresponding parameters does not directly correlate with the impact outcome.

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Cylindrically symmetric SPH simulations of hypervelocity impacts on thin plates

Cited by 109 publications

References 9 publications

Application of Smoothed Particle Hydrodynamics in analysis of shaped-charge jet penetration caused by underwater explosion

Application of Smoothed Particle Hydrodynamics in analysis of shaped-charge jet penetration caused by underwater explosion

Survival of the impactor during hypervelocity collisions – I. An analogue for low porosity targets

A new approach to modelling impacts on rubble pile asteroid simulants

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