GEPI : An Ice Generator for Dynamic Material Characterisation and Hypervelocity Impact

Héreil, Pierre‐Louis; Lassalle, F.; Avrillaud, G.

doi:10.1063/1.1780455

Cited by 25 publications

(9 citation statements)

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“…On such a shot, only one sample per panel has been used, but two and up to three samples in series can be fitted per panel (SNL/WSU development). Aluminum electrodes can also be used to get higher velocities than on copper and close to GEPI ones [2].…”

Section: B Real Load Shotsmentioning

confidence: 99%

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Veloce: A Compact Pulser for Magnetically Driven Isentropic Compression Experiments

Bavay¹,

Spielman²,

Avrillaud³

2008

IEEE Trans. Plasma Sci.

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The use of magnetic fields to isentropically compress materials for equation-of-state studies has been first demonstrated on the Z machine at Sandia National Laboratories. Sharing similarities with the GEPI pulser, a compact pulser has been designed and built, focusing on isentropic compression experiments. In order to achieve high compacity and fast turn around, the design is built around a solid dielectric transmission line to couple current from eight low-inductance capacitors that are switched with ultralow-inductance multichannel gas switches operating in dry air at atmospheric pressure. A peaking stage made of 72 capacitors enhanced by a low-inductance multichannel sharpening switch brings the fundamental rise time of the pulser down to 350 ns (10%-90%). A set of inductances in parallel with the sharpening switch as well as using various gases into this switch allow us to modify the current wave shape. The pulser delivers a peak current of 4 MA at a charge voltage of 80 kV on a short circuit. The rise time can be lengthened to around 650 ns for a current of 4.2 MA. The use of postholes convoluting in a solid dielectric insulation design makes that pulser unique, as well as its compact size, ease of use, and ease of access to the load.Index Terms-Equations of states, high pressure, low inductance, solid dielectric.

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Section: B Real Load Shotsmentioning

confidence: 99%

“…In order to meet these criteria, several innovative ideas have been used as well as the experience gathered from the HCE Institute and the GEPI pulser [2]. 1 Some components have seen several competing designs being tested in parallel in order to select the most appropriate to this project.…”

Section: Introductionmentioning

confidence: 99%

Veloce: A Compact Pulser for Magnetically Driven Isentropic Compression Experiments

Bavay¹,

Spielman²,

Avrillaud³

2008

IEEE Trans. Plasma Sci.

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“…An alternative to the plate-impact testing technique is the use of compact pulsed power generator testing facilities [40]. The principle of this technique is the following: a short and intense current (approx.…”

Section: Experimental Techniques Devoted To Brittle Materialsmentioning

confidence: 99%

Brittle materials at high-loading rates: an open area of research

Forquin¹

2017

Phil. Trans. R. Soc. A.

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Brittle materials are extensively used in many civil and military applications involving high-strain-rate loadings such as: blasting or percussive drilling of rocks, ballistic impact against ceramic armour or transparent windshields, plastic explosives used to damage or destroy concrete structures, soft or hard impacts against concrete structures and so on. With all of these applications, brittle materials are subjected to intense loadings characterized by medium to extremely high strain rates (few tens to several tens of thousands per second) leading to extreme and/or specific damage modes such as multiple fragmentation, dynamic cracking, pore collapse, shearing, mode II fracturing and/or microplasticity mechanisms in the material. Additionally, brittle materials exhibit complex features such as a strong strain-rate sensitivity and confining pressure sensitivity that justify expending greater research efforts to understand these complex features. Currently, the most popular dynamic testing techniques used for this are based on the use of split Hopkinson pressure bar methodologies and/or plate-impact testing methods. However, these methods do have some critical limitations and drawbacks when used to investigate the behaviour of brittle materials at high loading rates. The present theme issue of Philosophical Transactions A provides an overview of the latest experimental methods and numerical tools that are currently being developed to investigate the behaviour of brittle materials at high loading rates. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

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“…The GEPI machine (abbreviation for is a high-pulsed power generator based on the strip line concept [27], and is devoted to quasi-isentropic experiments or hypervelocity impact by accelerating a flyer plate [28]. This machine is used to study the dynamic behaviour of inert materials like ceramics [25,26], metals, composites [29] and mortar [30].…”

Section: Dynamic Characterizationsmentioning

confidence: 99%

Strain rate sensitivity of the tensile strength of two silicon carbides: experimental evidence and micromechanical modelling

Zinszner

Erzar

Forquin

2017

Phil. Trans. R. Soc. A.

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GEPI : An Ice Generator for Dynamic Material Characterisation and Hypervelocity Impact

Cited by 25 publications

References 0 publications

Veloce: A Compact Pulser for Magnetically Driven Isentropic Compression Experiments

Veloce: A Compact Pulser for Magnetically Driven Isentropic Compression Experiments

Brittle materials at high-loading rates: an open area of research

Strain rate sensitivity of the tensile strength of two silicon carbides: experimental evidence and micromechanical modelling

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