High-Speed Impact

Charters, A. C.

doi:10.1038/scientificamerican1060-128

Cited by 25 publications

(8 citation statements)

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“…Note that in the case hard macro-particles impacting a surface at similar velocities, the depth of penetration is typically only about 4-5 the particle diameter, e.g. [17].…”

Section: Super-deep Penetrationmentioning

confidence: 99%

Cold spray deposition: Significance of particle impact phenomena

Клинков¹,

Косарев

Rein³

2005

Aerospace Science and Technology

230

115

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“…Note that in the case hard macro-particles impacting a surface at similar velocities, the depth of penetration is typically only about 4-5 the particle diameter, e.g. [17].…”

Section: Super-deep Penetrationmentioning

confidence: 99%

Cold spray deposition: Significance of particle impact phenomena

Клинков¹,

Косарев

Rein³

2005

Aerospace Science and Technology

230

115

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“…It is these smaller drops which form vortex rings when they enter the water. Although no quantitative results are given, Keedy (1967) and Charters (1960) also observe this phenomenon when drops fall from large heights. Charters states that sometimes all the water of the initial drop appears in a secondary one.…”

Section: Introductionmentioning

confidence: 81%

On the attenuation of sea waves by rain

Manton

1973

Geophysical Fluid Dynamics

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Some conflicting evidence on Reynolds' (1900) hypothesis that rain should attenuate any wave motion on the sea surface is discussed. It is concluded that rain drops ought to produce vortex rings in the sea which mix the water to a sufficient depth to affect most waves, as asserted by Reynolds. By introducing vertical and horizontal eddy viscosities to model the mixing process, an estimate is found for the rate of attenuation of wave energy by the rain.Consequently, the net effect on the wave field of attenuation by rain and generation by wind is calcuIated.

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“…Craters produced by hypervelocity latex and iron projectiles were measured with SEM and SPM to be approximate hemispheres, similar to results noted by others. 7 When measured crater dimensions were convolved with interplanetary and Saturnian dust flux and mass estimates, an estimate of expected mirror surface damage was obtained. This estimate ranged from near insignificance for interplanetary dust at 1AU (1 to 20 X 10 -8 % per day) to a potentially significant effect for an exposed mirror during passage through the most intense parts of Saturn's rings (~10 -4 % damage in a few hours).…”

Section: Discussionmentioning

confidence: 99%

Hypervelocity particle impact studies performed on a gold-coated beryllium substrate mirror

Heaney¹,

Pearl

Stuebig

et al. 2004

SPIE Proceedings

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This paper presents the results of the hypervelocity projectile bombardment of a gold-coated beryllium substrate telescope mirror. Individual latex (ρ = 1.1 g/cm 3 ) and iron ( 7.9 g/cm 3 ) projectiles , in the size range 0.70 to 1.44µm (avg. mass = 0.24 -7.1 x 10 -15 kg), representative of interplanetary dust, with velocities from 2 -20 km/s, created impact craters in the composite mirror structure that were approximate hemispheres. The ratio of impact damage diameter to projectile energy was found experimentally to be close to 0.1µm/nJ for both latex and iron projectiles. These dimension data, combined with recent measurements of interplanetary and interstellar dust fluxes, can be used to estimate expected space telescope mirror surface damage and scattering increase due to hypervelocity dust impacts.

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High-Speed Impact

Cited by 25 publications

References 0 publications

Cold spray deposition: Significance of particle impact phenomena

Cold spray deposition: Significance of particle impact phenomena

On the attenuation of sea waves by rain

Hypervelocity particle impact studies performed on a gold-coated beryllium substrate mirror

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