Papers by Keyword: Penetrator

Abstract: In this paper, the fracture analysis model about the penetrator embedding pre-perforated steel plate vertically is set up. The threshold target impact velocity expression (if the penetrators fracture failure occurs) is obtained. In addition, the influence of the penetrators material parameters on the fracture failure, that is, the threshold target impact velocity, are listed and analyzed, such parameters including materials yield stress, tangent modulus, density and failure strain. The results show that the threshold velocity increases along with the material yield stress, tangent modulus and failure strain, inversely along with the material density. This study would provide strong theoretical and engineering basis for the penetrator design and analysis.

Abstract: The optimization of electric resistance welding conditions has been investigated in order to improve the resistance to hydrogen induced cracking at bondline in API 5L X60 line pipes from center-slit coils. It was found that the elongated (Si, Mn, Al) rich oxide inclusions at bondline provided a preferential site for HIC, but no evidence on the center segregation effects was found. Design of experimental (DOE) method was used to find out the optimum ERW condition in the viewpoint of the minimization of defects ratio at bondline. The optimum ERW condition suggested by DOE successfully led to an excellent HIC resistance at bondline. Furthermore, it was observed that there was no relation between segregation and HIC resistance at bondline.

Abstract: A new tungsten heavy alloy with hybrid structure was manufactured for the kinetic energy penetrator. The tungsten heavy alloy is composed of two parts: core region is molybdenum added heavy alloy to promote the self-sharpening; outer part encompassing the core is conventional heavy alloy to sustain severe load in a muzzle during firing. The fracture surfaces of the specimen is observed after ballistic tests. The core region revealed brittle behavior with W/W inter-granular fracture which activates self-sharpening. On the other hand, outer part exhibited conventional ductile fracture mode. From ballistic test, it was found that the penetration performance of the hybrid structure tungsten heavy alloy is higher than that of conventional heavy alloy. This heavy alloy is thought to be very useful for the penetrator in the near future.