Impact flash jet initiation phenomenology

Ang, James A.

doi:10.1016/0734-743x(90)90046-x

Cited by 55 publications

(26 citation statements)

References 5 publications

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“…Although Ang [1990] discusses only velocity effects for vertical impacts, the same argument may hold for oblique impacts. It is noted here that the model by Vickery [1993] was developed for a collision between the same material of projectile and target.…”

Section: Model Reassessmentmentioning

confidence: 99%

“…Using an analytical approach, he found that some combination of projectile and target matedhals has impact velocities at which the matedhal (i.e., either projectile or target) reaching a jetting condition alternates. Ang [1990] suggests further that this transition may cause the anomalous luminosity change as a function of impact velocity observed in micro-impact experiments [Eichhorn, 1976].…”

Section: Model Reassessmentmentioning

confidence: 99%

“…Such an assumption, however, is not correct in a strict sense because no real fluids are inviscid; hence, no velocity jump is allowed anywhere. Thus it can also be assumed that two velocity components are equal across the boundary [Ang, 1990]. For the latter assumption, however, a pressure jump exists across the boundary.…”

Section: Asymmetric Jettingmentioning

confidence: 99%

“…The thickness of the two components of a jet, however, does not necessarily have to be identical. In fact, Ang [1990] argues that a jetting phase may be dominated by material from either projectile or target depending on which component reaches the critical condition for jetting first. Both the effective impact velocity and wedge angle between projectile and target change during penetration.…”

Section: Model Reassessmentmentioning

confidence: 99%

“…During penetration, either the projectile or target eventually will reach a critical condition for jetting. If the projectile reaches a jetting condition first, Ang [1990] argues that the resulting jet will be dominated by projectile material. Using an analytical approach, he found that some combination of projectile and target matedhals has impact velocities at which the matedhal (i.e., either projectile or target) reaching a jetting condition alternates.…”

Section: Model Reassessmentmentioning

confidence: 99%

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Spectroscopic characterization of hypervelocity jetting: Comparison with a standard theory

Sugita¹,

Schultz²

1999

J. Geophys. Res.

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Abstract. Symmetric collision between two identical plates has yielded successful theoretical models for the jetting process. Consequently, assessment of impact jetting at planetary scales has been largely based on the theories developed for such specific types of collisions. Little experimental work has been done, however, to measure both temperature and target-to-projectile mass ratio of jetting created by spherical projectiles impacting planar targets, which typify planetary impacts. The goal of this study is to examine the validity of applying planar-impact theories to jetting due to impacts of spherical projectiles into planar targets. Using a newly developed spectroscopic approach, we observe jetting created by Copper spheres impacting planar dolomite targets at hypervelocities. In contrast with previous experiments using quartz projectiles, the observed mean temperatures of jets due to copper projectiles does not correlate well with the vertical component of impact velocity. Instead, the observed temperatures of jets show much better correlation with impact velocity than the vertical component of impact velocity and impact angle. The experiments also reveal that the target-to-projectile mass ratio within a jet increases with impact angle (measured from the horizontal). In order to understand the significance of these experimental results, they were then compared with a jetting model for asymmetric collisions based on standard theories. Such a comparison indicates qualitative consistencies, such as complete vaporization of the carbonate target (as opposed to mere degassing of carbon dioxide due to incomplete vaporization of carbonate) and higher target-to-projectile mass ratio in a jet at higher impact angles. Quantitative comparison, however, also reveals significant inconsistencies between theory and experiments, such as an impact-angle effect on jet temperature and a correlation in jet temperatures between projectile and target components. In order to resolve these inconsistencies, new factors such as viscous shear heating and the nonsteady state nature of the jetting processes may need to be considered.

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Section: Model Reassessmentmentioning

confidence: 99%

Section: Model Reassessmentmentioning

confidence: 99%

Section: Asymmetric Jettingmentioning

confidence: 99%

Section: Model Reassessmentmentioning

confidence: 99%

Section: Model Reassessmentmentioning

confidence: 99%

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Spectroscopic characterization of hypervelocity jetting: Comparison with a standard theory

Sugita¹,

Schultz²

1999

J. Geophys. Res.

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Dynamics of hypervelocity jetting during oblique impacts of spherical projectiles investigated via ultrafast imaging

Kurosawa

Nagaoka

Senshu

et al. 2015

J. Geophys. Res. Planets

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A series of hypervelocity impact experiments was conducted in a new laboratory at Planetary Exploration Research Center of Chiba Institute of Technology (Japan). We present the results of high-speed imaging observations of impact jetting during blunt-body penetration under oblique impacts. The observations were sampled at a frame rate of 100 ns frame À1 , which is much shorter than the characteristic time of projectile penetration under our experimental conditions. The maximum jet velocity was obtained as a function of both impact velocity and the contrast of shock impedance between a projectile and target, enabling us to test theoretical models of impact jetting during oblique impacts of spherical projectiles. We find that the jet velocities measured in this study are much slower than the prediction by the standard theory based on the previous experimental/theoretical results of collisions between two metal plates. A decaying shock pressure during blunt-body penetration is a possible origin of the discrepancy. We also present a new formulation of the jet velocity with the equations of state for realistic materials. The particle velocities of ejected materials from a free surface are calculated using the Riemann invariant along the isentropes and the Tillotson equations of state in this study. Based on the extremely high velocity of the jet, we point out that impact jetting might contribute to chemistry near the ground surface of planets/satellites with a thick atmosphere, such as Titan.

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Jetting in Oblique, Asymmetric Impacts

Miller

1998

Icarus

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Impact flash jet initiation phenomenology

Cited by 55 publications

References 5 publications

Spectroscopic characterization of hypervelocity jetting: Comparison with a standard theory

Spectroscopic characterization of hypervelocity jetting: Comparison with a standard theory

Dynamics of hypervelocity jetting during oblique impacts of spherical projectiles investigated via ultrafast imaging

Jetting in Oblique, Asymmetric Impacts

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