Ejecta - an overview | ScienceDirect Topics
The rock avalanche/ ejecta (RAEJ) documented by Crosta et al. (2018a, b) represent peculiar types of landslides that can be found on Mars but are unknown on Earth (Fig. 14). These landslides initially acquired momentum by asteroid impact and started as impact ejecta or as destabilization of slope masses directly neighboring the impact crater ...
Ejecta from impact craters - ScienceDirect
2011年1月1日 · Ejecta were collected in bins at various distances from the impact. The observed nearly-90° ejection angle and the fall-distance to the chamber floor were used to calculate the ejection velocity of material in the collection bins. The …
Ejecta - an overview | ScienceDirect Topics
Martian ejecta blankets often indicate extensive ground-hugging flow away from the crater, most likely due to groundwater or melted ice in the ejecta. Extensive, runout ejecta flows exist on Venus, thought to be due to entrained atmosphere or an enhanced fraction of impact melt in the ejecta (due to the high surface temperatures of Venusian ...
Explosion characteristics of two-phase ejecta from large-capacity ...
The primary component of battery initial ejecta is EMC, with a phase ratio of ejecta gas to liquid of 4.92:1. (2) In the ejecta from two phases of the battery, EMC has the lowest explosion limit and optimal explosion concentration, at 2.85 % and 8.6 % respectively, making it the most prone to explosion with maximum explosive power.
Lunar crater ejecta: Physical properties revealed by radar and …
2016年7月15日 · The pattern of ejecta reflected by the radar enhancement suggests an oblique impact from the West. Though the same pattern appears in the S-band image, the enhancement is not nearly as strong, and is much less uniform. As with Hercules, this indicates ejecta burial depths of 1 m or more for most of the blocks. The inner halo of Hercules crater ...
Ejecta velocity and motion model of spherical aluminum alloy …
2024年11月1日 · The ejecta distribution satisfies a rotationally symmetric distribution along the Y-axis. The XOZ plane represents the surface position of the target, which is the initial ejection position of the ejecta. The ejecta forms a hollow cone with an angle approaching 140°. From Table 9, The cone angle decreases with increasing impact velocity.
Ejecta mobility of layered ejecta craters on Mars: Assessing the ...
2014年5月1日 · 1. Introduction. Martian impact craters often exhibit unique ejecta morphologies relative to ballistically-dominated ejecta observed in lunar and mercurian impact craters (Carr et al., 1977, Schultz and Gault, 1979): martian lobate ejecta deposits frequently have distinctive ejecta deposit boundaries rather than an ejecta deposit of gradational thickness, and appear …
Measuring ejecta characteristics and momentum transfer in …
2019年3月1日 · As an example, Fig. 3 shows the ejecta velocity histogram with cumulative size distribution for a Cu projectile impacting on a sandstone target. A luminescent transient plasma plume followed by a steepening ejecta cone and completed by the detachment of spall fragments characterizes the typical evolution of ejecta [12]. The high-speed camera ...
Ejecta distribution and momentum transfer from oblique impacts …
2022年3月1日 · The amount by which crater ejecta enhances asteroid deflection—that is, the momentum of the crater ejecta that escapes the gravitational attraction of the target body divided by the impactor momentum (β − 1)—has been found to vary significantly depending on the target asteroid’s properties, composition and structure (e.g., Jutzi and ...
Microscopic ejecta measurements from hypervelocity impacts on …
2021年6月1日 · We address the latter with measurements of the microscopic ejecta distribution produced by light gas gun impacts on solid aluminum and powdered regolith simulant targets. We examine both the size and shape of the ejecta using thin-film witness plates and find that the size distributions of microscopic ejecta follow power laws.