Analysis of Erosion Transition in Tungsten-Alloy Rods into Aluminum Targets

Abstract

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On the deep penetration of deforming long rods

“…It turns out that all these models result in a value of H ¼ ð2:8-3ÞY t for the resisting stress which characterizes the indentation process. Similar arguments can also be found in the recent article by Segletes (2007). Thus, we can adopt the value of H 0 ¼ 3Y t , for the initial resisting stress, which the target exerts on the rod at the impact point.…”

“…This lateral stress ðH lat Þ is due to the target strength, which is resisting the process of crater formation. The lateral stress applies a considerable support to the rod's nose, as has been suggested recently by Segletes (2007). He considered this lateral support as the source for the effectively high strength which these rods exhibit before the onset of erosion.…”

“…He considered this lateral support as the source for the effectively high strength which these rods exhibit before the onset of erosion. In Segletes (2007) this lateral stress was estimated by considering the final shape of spherical nosed tungsten rods perforating aluminum plates. The resulting values for this supporting stress, according to Segletes (2007), were on the order of target's resistance to penetration.…”

“…In Segletes (2007) this lateral stress was estimated by considering the final shape of spherical nosed tungsten rods perforating aluminum plates. The resulting values for this supporting stress, according to Segletes (2007), were on the order of target's resistance to penetration. Our understanding is that this approach is correct and that an effective lateral support is preventing the deformation of the rod's nose, once it is embedded in the target.…”

“…Our understanding is that this approach is correct and that an effective lateral support is preventing the deformation of the rod's nose, once it is embedded in the target. The direct consequence of this support is to increase the strength of the rod from Y p to an effective strength of Y eff ¼ Y p þ H lat , as was done by Segletes (2007). We assume that the lateral support is increasing from zero, at the impact point, to its maximum value which is reached during the entrance phase.…”