Small-size railgun of mm-size solid bodies for hypervelocity material testing

Poniaev, S. A.; Bobashev, S. V.; Zhukov, B. G.; Kurakin, R. O.; Sedov, A.I.; Izotov, S.N.; Kulakov, S. L.; Смирнова, М.Н.

doi:10.1016/j.actaastro.2014.11.012

Cited by 29 publications

(8 citation statements)

References 11 publications

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“…The factors taken up for the study consisted of the thickness of the wall, the density and the impact speed. In 2015, Poniaev et al [93], developed a lab-scale rail gun to bombard a fiber-metal laminate whipple shield comprising an external aluminium bumper followed by ultra-high molecular weight poly-ethylene core. It was observed that the factors such as area and degree of the perforation depended on the thickness of the aluminium bumper.…”

Section: Experimental Analysis Of Whipple Shieldsmentioning

confidence: 99%

Advances in the Whipple Shield Design and Development:

Pai

Divakaran

Anand

et al. 2021

J. dynamic behavior mater.

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Safety of satellites as well as spacecrafts during space missions is a primary objective to preserve the physical and virtual assets onboard. Whipple shields belong to the class of protective equipment provided on the surface of the spacecrafts and satellites, to sustain impacts from the ultra-high speed debris, which can otherwise cause considerable damage to the corresponding structures. Recent works on whipple shields are focussed on determining the response of different geometrical arrangements and material properties under hyper-velocity impact at projectile speeds of 3-18 km/s. Advances in the whipple shield design include integrated and mechanised models employing high performance materials like fiber-metal laminates ensuring better operational capability. The forward bumper of the whipple shield is the first line of defence as it regulates the state of projectile after the primary impact. Use of aluminium alloys for front bumpers is popular, owing to their lightweight and strength characteristics. The advances for the front bumper have seen usage of ceramic, metallic foams, and super composite mixtures, which resulted in enhanced performance, durability and safety of the whipple shields. This work is a comprehensive coverage of the latest materials used for whipple shields, their performance characterization—both experimental and theoretical, and applications.

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Section: Experimental Analysis Of Whipple Shieldsmentioning

confidence: 99%

Advances in the Whipple Shield Design and Development:

Pai

Divakaran

Anand

et al. 2021

J. dynamic behavior mater.

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“…The simplest design for the seeding process would be the from-orbit delivery via nano-sized reentry capsules, which could be in turn ejected backwards at high velocities, viz decelerated with respect to the orbital motion of the main Genesis probe, by a compact railgun (Poniaev et al 2015). A minimal heat shield would then be enough to protect the content of the delivery capsules during the subsequent drop to the surface.…”

Section: Seeding With Unicellular Organismsmentioning

confidence: 99%

Developing ecospheres on transiently habitable planets: the genesis project

Gros

2016

Astrophys Space Sci

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It is often presumed, that life evolves relatively fast on planets with clement conditions, at least in its basic forms, and that extended periods of habitability are subsequently needed for the evolution of higher life forms. Many planets are however expected to be only transiently habitable. On a large set of otherwise suitable planets life will therefore just not have the time to develop on its own to a complexity level as it did arise on earth with the cambrian explosion. The equivalent of a cambrian explosion may however have the chance to unfold on transiently habitable planets if it would be possible to fast forward evolution by 3-4 billion years (with respect to terrestrial timescales). We argue here, that this is indeed possible when seeding the candidate planet with the microbial lifeforms, bacteria and unicellular eukaryotes alike, characterizing earth before the cambrian explosion. An interstellar mission of this kind, denoted the 'Genesis project', could be carried out by a relatively low-cost robotic microcraft equipped with a on-board gene laboratory for the in situ synthesis of the microbes.We review here our current understanding of the processes determining the timescales shaping the geo-evolution of an earth-like planet, the prospect of finding Genesis candidate planets and selected issues regarding the mission layout. Discussing the ethical aspects connected with a Genesis mission, which would be expressively not for human benefit, we will also touch the risk that a biosphere incompatibility may arise in the wake of an eventual manned exploration of a second earth.

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“…They are used mostly in distributed power systems of high energy and in smaller constructions, e.g. for fracture tests of materials (Schneider et al, 2015;Poniaev et al, 2015;Waindok and Piekielny, 2016).…”

Section: Introductionmentioning

confidence: 99%

Analysis of an iron-core and ironless railguns powered sequentially

Waindok

Piekielny

2018

COMPEL

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Purpose The purpose of this paper is to calculate and measure transients for two different constructions of electrodynamic accelerators (ironless and iron-core) supplied by a three-section power system (three capacitor banks). The optimization of power supply parameters (switch-on times and capacitances of individual sections) in terms of system efficiency has been carried out. Design/methodology/approach Calculations have been carried out using a field-circuit model. For three-dimensional magnetostatic analysis, the Maxwell software and finite element method (FEM) were used, while for circuit model, the Matlab/Simulink software was implemented. For optimization of the supply system parameters, the genetic algorithm was used. The mathematical models were verified experimentally by using the original laboratory stand. Findings The efficiency of the system is much higher in case of iron-core accelerator. In both cases, the results obtained for optimized supply settings are only slightly better than those obtained by simultaneously switching on the thyristors and for symmetrical capacity division. Research limitations/implications Due to the presented field-circuit model, eddy currents in rails have been neglected. In the field model, there was no possibility to combine current flow calculations with moving of the projectile. Originality/value Using the presented filed-circuit model, both electrical and mechanical transients could be calculated with sufficient precision. Thus, it could be used in the optimization of supply system. The solution time is low compared with the solution time of the transient field model.

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Small-size railgun of mm-size solid bodies for hypervelocity material testing

Cited by 29 publications

References 11 publications

Advances in the Whipple Shield Design and Development:

Advances in the Whipple Shield Design and Development:

Developing ecospheres on transiently habitable planets: the genesis project

Analysis of an iron-core and ironless railguns powered sequentially

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