Abstract
Explosively driven fragmentation of ductile metals cylinders is a highly complex phenomenon. In this work, the fracture characteristics of exploded TA2 titanium alloy cylinder with varied charge were investigated numerically and experimentally. The results show that the fracture surfaces of fragments lie along planes of maximum shear stress for either a higher or a lower detonation pressure, but their mechanism is different. The finite element analysis demonstrated that the equivalent plastic strain in the middle of the wall is always larger than that of inner and outer wall for metal cylinder during the stage of shock wave driven period. For the high explosive pressures, the micro-cracks originated firstly in middle zone of wall during the stage of shock wave driven, and extend to the inner and outer wall in the direction of maximum shear stress. Explosives which generate lower detonation pressures, the shear fracture of cylinder originated from the inner wall and propagate to the outer wall in an angle of 45° or 135° to radial, the crack begin at the stage of free expansion. The simulated analysis of the process of deformation and fragmentation for exploded metal cylinder agree with the experimental results.
Highlights
The fragmentation of explosively driven cylinder has long been of interest in the military field, which relate to the applications including the design of fragment and blast resistant structures and protective facilities [1,2,3,4]
The study focuses on the process and mechanism of fragmentation of cylinder under different explosive pressure
Explosives which generate lower detonation pressures, the shear fracture of cylinder originated from the inner wall and propagates to the outer wall in an angle of 45° or 135°, different from that of higher detonation pressure, the crack begin at the stage of free expansion
Summary
The fragmentation of explosively driven cylinder has long been of interest in the military field, which relate to the applications including the design of fragment and blast resistant structures and protective facilities [1,2,3,4]. These works laid the foundation of the study that continues to this day [4,5,6] It is a highly complex phenomenon in which the fragmenting material is plastically deformed by the passage of an intense shock (∼102 GPa) followed by high-rate expansion deformation that leads to fracture, more attention has been paid to the process and mechanism of fragmentation evolution in recent years[4,5,6,7,8,9,10]. The study focuses on the process and mechanism of fragmentation of cylinder under different explosive pressure
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