Sliding Instabilities and Hypervelocity Gouging

Watt, T.; Bourell, David L.

doi:10.1109/tps.2010.2076313

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…McNab et al 2005;Reck et al 2009;Satapathy et al 2005;Schneider et al 2009a). Major problems of launchers in this respect are gouging (Watt and Bourell 2011) and contact transition (see section 1.8). Both phenomena appear at the sliding contact interface causing damage to the rails.…”

Section: Limits and Challenges Of Electromagnetic Launchmentioning

confidence: 99%

“…It is seen as a pure mechanical phenomenon because it is also observed in non-current carrying rocket sledges (Graff and Dettloff 1969). The current explanation for the occurrence of the eyedrop-shaped sink-holes is the interaction between surface asperities of the sliding members which is strongly influenced by inertial forces, the wave nature of stress propagation and local impact stresses Watt and Bourell (2011).…”

Section: Limits and Challenges Of Electromagnetic Launchmentioning

confidence: 99%

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The investigation of electromagnetic processes in electromagnetic launchers using colossal magnetoresistance sensors

Liebfried¹

2011

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Section: Limits and Challenges Of Electromagnetic Launchmentioning

confidence: 99%

Section: Limits and Challenges Of Electromagnetic Launchmentioning

confidence: 99%

The investigation of electromagnetic processes in electromagnetic launchers using colossal magnetoresistance sensors

Liebfried¹

2011

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“…1) typically is a damage mechanism that occurs on the surface of rails of electromagnetic railgun [1,2] . The phenomenon also has been observed on rocket sled tracks and light gas gun barrels up to the present [3,4] .…”

Section: Introductionmentioning

confidence: 99%

Impact physics model and influencing factors of gouging for electromagnetic rail launcher

Zhu

Zhang

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Gouging is a damage mechanism that occurs on the surface of rails of electromagnetic railgun. The disadvantages of gouging include lowering efficiency of railgun system, decreasing life of rails and reducing direction accuracy of projectile. According to configuration and dimension of the experimental arrangement, analysis of rail vibration induced by hypervelocity sliding load and numerical solve of the dynamic response for rails have been accomplished. Based on numerical solve of the dynamic response for rails under hypervelocity sliding load, a gouging physics model of impact has been established in this paper, and gouging on the rail was successfully replicated in LS-DYNA. Through dynamic simulating, effect rule of influencing factors such as deflection bulge size on the formation of gouging and key phenomenon of gouge process were investigated. The results suggested that the obvious gouging would be avoided by lowering the maximal local deflection size in 0.5mm; the structure of smooth on the head of the armature and decrease of contact pressure between armature and rails can be utilized to alleviate the damage; during gouging process, maximal strain-rate of rail material could reach to 10 7 s -1 while the contact area and velocity of armature would fell greatly. This work would be a foundation of future effort of avoiding rail gouging during the launch duration.

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3D numerical simulation and analysis of railgun gouging mechanism

Tang

Lin

et al. 2016

Defence Technology

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Sliding Instabilities and Hypervelocity Gouging

Cited by 7 publications

References 29 publications

The investigation of electromagnetic processes in electromagnetic launchers using colossal magnetoresistance sensors

The investigation of electromagnetic processes in electromagnetic launchers using colossal magnetoresistance sensors

Impact physics model and influencing factors of gouging for electromagnetic rail launcher

3D numerical simulation and analysis of railgun gouging mechanism

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