Hypervelocity impact flash and plasma on electrically biased spacecraft surfaces

Hew, Yayu Monica; Goel, Ashish; Close, Sigrid; Lee, N.

doi:10.1016/j.ijimpeng.2018.05.008

Cited by 30 publications

(8 citation statements)

References 15 publications

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“…In [10,11], simulation and analysis of the possibility of using an explosive accelerator to simulate the impact of cosmic dust stream on spacecraft materials in ground conditions. [12][13][14][15][16] presented modelling and experimental data on the interaction of high-speed bodies and particles with spacecraft materials. The authors of [17][18][19] present methods of high-speed dust particle streams acceleration.…”

Section: Sdp Modelsmentioning

confidence: 99%

Dynamic Alloying of Steels in the Super-Deep Penetration Mode

Usherenko¹,

Mironovs²,

Ушеренко³

et al. 2022

Preprint

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The dynamic effects observed in collisions represent a specific area of high-energy interaction located at the boundary of mechanics, hydrodynamics, shock wave physics, and alternating high-pressure regions. The paper shows that in the volume of a solid metal body, as a result of dynamic alloying by a high-speed stream of powder particles in the super-deep penetration mode (SDP), fibre structures of altering material arise, forming the framework of the composite material. The stream of powder particles in the metal obstacle following the path of least resistance and the impact of shock waves on particles results in a volumetric framework from the products of interaction between the injected and matrix materials. When using SDP, defective structural elements (channelled) - germs of reinforcing fibres arise. At the subsequent heat treatment, there is an intensive diffusion. The growth process of reinforcing fibres shifts to higher temperatures (as compared to the standard mode), leading to an increase in the bending strength of the fibre material up to 13 times for high-speed tool W6Mo5Cr4V2 steel. As a result of the completion of the growth of reinforcing fibres in the volume of the W6Mo5Cr4V2 steel, the material's bending strength in 1.2 times is realised. Simultaneously, it provides an increase of wear resistance 1.7-1.8 times.

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Section: Sdp Modelsmentioning

confidence: 99%

Dynamic Alloying of Steels in the Super-Deep Penetration Mode

Usherenko¹,

Mironovs²,

Ушеренко³

et al. 2022

Preprint

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“…In the third stage, the Debye length λ D is much larger than the cloud size R c ; the plasma enters the single particle motion regime, so the particles can freely expand away from the impact site. Spacecraft potential relative to the ambient plasma can suppress or enhance the escape of particles, depending on the polarities (Hew et al, ). Electrons escape faster than ions, creating two fronts of escaping charges.…”

Section: Impact Ionization and Plasma Cloud Expansionmentioning

confidence: 99%

Understanding Cassini RPWS Antenna Signals Triggered by Dust Impacts

Vaverka

Nouzak

et al. 2019

Geophysical Research Letters

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Electric field antennas are capable of detecting dust impacts in different space environment. We analyze the dust impact signals detected by the Cassini Radio and Plasma Wave Science instrument at different locations around Saturn and compare them with dust impact signals simulated in laboratory conditions and numerically. The spacecraft potential, the size, and capacitance of the impacted element and ambient plasma have a strong effect on the amplitude and the shape of impact signals, providing important clues to understanding the signal generation mechanism. The voltage signal on the antenna is due to the separation of the impact generated charges, which occurs as electrons and ions can either escape (at different speeds) or be collected by the impacted element depending on the spacecraft potential.

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“…A number of experimental investigations of the spectral content of the impact flash have been performed ( 13 , 15 , 17–19 ) at high impact velocities (5–7 km

). At impact velocities in excess of 10–15 km s

projectiles may be shock vaporized entirely, and the radiation dynamics and expansion of the vapor and plasma dominate the impact flash ( 20 , 21 ). The study of orbital and planetary impacts being a common motivation for such work, laboratory hypervelocity experiments often utilize low-density and lower strength materials to more closely resemble the dynamics of real-life impacts despite the velocity limitations of launch systems.…”

Section: Introductionmentioning

confidence: 99%

First contact: Fine structure of the impact flash and ejecta during hypervelocity impact

et al. 2023

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Hypervelocity impacts are a significant threat in low-earth orbit and in hypersonic flight applications. The earliest observable phenomena and mechanisms activated under these extreme conditions are typically obscured by a very bright flash, called the impact flash, that contains the signatures of the critical mechanisms, the impacting materials, and the impact environment. However, these signatures have been very difficult to observe because of the small length and time scales involved coupled with the high intensities associated with the flash. Here we perform experiments investigating the structure and characteristics of the impact flash generated by 3 km s−1 spherical projectile impacts on structural metals using temporally co-registered high-resolution diagnostics. Reciprocal impact configurations, in which the projectile and target material are swapped, are used to demonstrate the coupling of early-stage mechanisms in the flash and later-stage ejection mechanisms responsible for the development of the impact crater.

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Hypervelocity impact flash and plasma on electrically biased spacecraft surfaces

Cited by 30 publications

References 15 publications

Dynamic Alloying of Steels in the Super-Deep Penetration Mode

Dynamic Alloying of Steels in the Super-Deep Penetration Mode

Understanding Cassini RPWS Antenna Signals Triggered by Dust Impacts

First contact: Fine structure of the impact flash and ejecta during hypervelocity impact

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