Launching tactically configured solid armature projectiles from large and medium calibre railguns-results from the DRA test programme

Kirkpatrick, D.; Haugh, D.

doi:10.1109/20.559913

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Experiments with a 90 mm calibre railgun in Kirkcudbright accelerating solid U-shaped armatures [7] also attest to pinch-effect action. On contact tails of post-shot recovered armatures transverse contractions can be seen (figure 2), while longitudinal slits, initially 2 mm wide, dividing each tail in two expand.…”

Section: Manifestation Of Pinch-effect Action In Experiments With Lar...mentioning

confidence: 85%

“…As a result, the melting wave shifts over the contact surface toward the front edge of the armature, which eventually destroys the SSC. It should be pointed out that the VSE theory has still not got unambiguous experimental verification [7]. Recalling that friction allows one-dimensional treatment, a-spots can be considered in onedimensional (1D) or two-dimensional (2D) approximation, and the VSE theory was developed in a planar approach assuming the electric contact between the sliding surfaces to be ideal as long as they remain solid [6].…”

Section: Introductionmentioning

confidence: 99%

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The importance of three dimensions in the study of solid armature transition in railguns

Drobyshevski

Kurakin

Rozov³

et al. 1999

J. Phys. D: Appl. Phys.

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It is shown experimentally that the main processes first causing breakdown of the sliding solid contact (SSC) carrying large currents are not two-dimensional processes of the velocity skin-effect type, but pinch instabilities developing in the contact interface. Electromagnetic and electrothermal explosive ejection of ionized material of low-mass pinch waists ignite parasite-shunting arcs behind and ahead of the armature under acceleration. Thus one has to speak of transition into arcing mode not of the SSC alone, but of the launch process as a whole.It has been noted that during the transition into the arcing mode the solid armature begins to behave as a hybrid armature of pulling type. At this operation mode, two stable arcs appear, due to pinch cords moving forward along the contact surfaces, which are fixed to both contact surfaces of the armature near their leading edges. Consequently, the armature main body is accelerated under the action of internal tensile forces originating in its leading part where the I × B forces are applied.

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Section: Manifestation Of Pinch-effect Action In Experiments With Lar...mentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

The importance of three dimensions in the study of solid armature transition in railguns

Drobyshevski

Kurakin

Rozov³

et al. 1999

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Note that the 3D calculations are more specific in pointing out that the heating should initially be the highest in peripheral regions of the root closest to the insulating bore walls. A description of traces of molten material in these regions observed on recovered armatures can be found, for instance, in [14,15].…”

Section: Observing the Ted Effect Mass Loss From The Armaturementioning

confidence: 99%

Observation of inertially-driven thermo-electro-dynamic mass loss from an electromagnetically accelerating armature

Drobyshevski

Kurakin

Rozov

et al. 2000

J. Phys. D: Appl. Phys.

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The reasons for the heavy mass losses usually observed to occur from various parts of recovered solid armatures, even in cases where there was no transition, remain unclear. We earlier suggested that the losses could result from strong non-uniformities in the distribution of thermodynamic, electrical and dynamic parameters in the body of the accelerating armature, the so-called TED effects. As a consequence, some surface areas of the armature can break away from the main body to be either ejected forward or to lag behind by inertia. This paper presents ultra-high-speed camera sequences demonstrating continuous inertial mass loss from the root of a C-shaped armature, where local current concentration gives rise to a strong heating of the material. The mass loss is particularly intensive when launched on the rails coated by an In-Ga eutectic. This may imply that the current concentration is stronger in the rear part of the armature contact surfaces.

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An update on the UK electric gun research programme

Haugh¹

1997

IEEE Trans. Magn.

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Launching tactically configured solid armature projectiles from large and medium calibre railguns-results from the DRA test programme

Cited by 8 publications

References 11 publications

The importance of three dimensions in the study of solid armature transition in railguns

The importance of three dimensions in the study of solid armature transition in railguns

Observation of inertially-driven thermo-electro-dynamic mass loss from an electromagnetically accelerating armature

An update on the UK electric gun research programme

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