Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

Ghassemi, Maleehe; Varmazyar, Mostafa

doi:10.1016/j.ijimpeng.2008.07.033

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…[11], and Refs. [12][13][14] treat moving load problems occurring in electromagnetic launchers. Here, we choose to describe the problem in a coordinate system, in which the load is fixed.…”

Section: Fe Analysis Of Stresses In the Conductormentioning

confidence: 99%

Stresses in a Long Cylindrical Conductor Moving Axially Through a Pair of Electrode Plates Under Stationary Conditions

Westerling

Lundberg

2013

Journal of Applied Mechanics

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In a conductor carrying electric current, the Lorentz force gives rise to mechanical stresses. Here, we study a long elastic cylindrical conductor that moves axially with constant velocity through two electrode plates. The aims are to explore how the stresses in the conductor depend on the velocity in the stationary case of constant current and to assess the validity of the analytic method used. The diffusion equation for the magnetic flux density is solved by use of Fourier transform, and the current density is determined. The stresses, due to the Lorentz force, are found by use of an analytic method combining the solutions of a quasi-static radial problem of plane deformation and a dynamic axial problem of uniaxial stress. They are also determined through FE analysis. Radial field profiles between the plates indicate a velocity skin effect signifying that the current and the magnetic field are concentrated near the cylindrical surface up-stream and are more uniformly distributed downstream. The radial and hoop stresses are compressive, while the axial stress is tensile. The von Mises effective stress increases towards the symmetry axis, in the downstream direction, and with velocity. There are circumstances under which a large current can produce an effective stress in a copper conductor of the order of the yield stress without causing a significant temperature rise. The stresses obtained with the two methods agree well, even relatively near the electrode plates. The analytical method should be useful in similar cases as well as for the provision of test cases for more general simulation tools.

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“…[11], and Refs. [12][13][14] treat moving load problems occurring in electromagnetic launchers. Here, we choose to describe the problem in a coordinate system, in which the load is fixed.…”

Section: Fe Analysis Of Stresses In the Conductormentioning

confidence: 99%

Stresses in a Long Cylindrical Conductor Moving Axially Through a Pair of Electrode Plates Under Stationary Conditions

Westerling

Lundberg

2013

Journal of Applied Mechanics

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“…However, at present for the railgun ablative case there does not exist a standard test and evaluation method. The sliding electrical contact of an electrode under high electrical currents can cause severe erosion, which will not only reduce the life of the fixed electrodes, but also affect the contact reliability between electrodes [15][16][17][18][19]. In this paper, a special experimental apparatus for armature electrical contact ablation was designed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of railgun aluminum armature electrical contact ablation

Peng

Zhan

2014

JAE

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Because of strong current, friction and arcing, electrical contact ablation occurs in the transmitting process of electromagnetic railgun, which is also one key issue in application. In this paper, an experimental apparatus is designed to detect electromagnetic railgun armature contacts ablation. Energy dispersive X-ray, scanning electron microscopy, high-resolution camera and rogowski coil are used to measure mass loss, volume change, the ablation layer analysis, the element distribution on ablation layer section and the electrical contact analysis. Experimental results show that the input current and the contact pressure between electrodes are the major factors contributing to the ablation volume loss and mass loss. It is also showed that as a sliding electrode, the aluminum armature ablates more seriously during launch.

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“…This can be seen by dotted lines passing through the projectile at X=0. Relationship of resistance and inductance to this position can be seen in the (6) and (9). As the energy will get transferred from the capacitor, projectile will start moving forward from position 1 to position 2.…”

Section: Modeling and Simulation Of The Discharging Circuitmentioning

confidence: 99%

“…Electromagnetic launchers have very diverse applications. They can be used from launching loads as small as a projectile to loads as large as a space shuttle [6]. Because of such flexibility in its configuration and its parameters, electromagnetic launchers are getting very popular.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of an Electromagnetic Railgun

Brahmbhatt¹

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Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

Cited by 10 publications

References 6 publications

Stresses in a Long Cylindrical Conductor Moving Axially Through a Pair of Electrode Plates Under Stationary Conditions

Stresses in a Long Cylindrical Conductor Moving Axially Through a Pair of Electrode Plates Under Stationary Conditions

Experimental study of railgun aluminum armature electrical contact ablation

Design and Optimization of an Electromagnetic Railgun

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