Experimental Study of Fragmentation Behavior of ExplodedTA2 Alloy Cylinders with Varied Charge
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摘要: 金属柱壳外爆的膨胀碎裂过程及机理十分复杂,与多个因素有关。对TA2钛合金柱壳在不同装药爆炸驱动下的膨胀碎裂开展实验研究,探讨载荷特性对金属柱壳变形、碎裂过程及碎片特征的影响。结果显示:在较高爆炸压力作用下,柱壳厚度方向的中间部位首先形成损伤带,碎裂破坏从该处起始向内、外表面扩展,且随着载荷脉宽的减小,试样厚度中部的损伤带却更趋严重,试样外表面产生层裂破坏现象;在较低爆压下,断裂裂纹从内壁起始,沿45°或135°方向剪切扩展,断裂机制与较高爆压下不同。分析认为,不同特性爆炸冲击波来回反射、相互作用会导致不同机制竞争,影响柱壳断裂起始、裂纹扩展过程及模式。Abstract: The explosively driven fragmentation of ductile metals is a complex phenomenon, for that the fracture modes and mechanisms are affected by materials, configuration and explosive energy in different ways.In this research, we investigated experimentally the deformation and fracture behavior of the exploded TA2 titanium alloy cylinders driven by varied charges.The results show that the shearing fracture of TA2 cylinders subjected to a high explosion pressure is initiated from the middle of the cylinder in the radial direction where a region of damage and micro-voids is formed, and then propagates to the inner and outer surfaces. As the detonation wavelength decreases, the damage and micro-voids formed in the middle of wall thickness deteriorate, and the spallation occurs in the specimen's outer surface.While under a lower detonation pressure, the cracks originate from the inner surface, and extend in the shear direction of 45° or 135° to the radial.The fracture mechanism is different under different load pressures.It is found that the different states of the wave's propagation and reflection between the wall surfaces lead to the competition of multiple facture mechanisms, thereby affecting the failure mode of cylinder shell, such as the cracking origination and extension.
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Key words:
- explosion mechanics /
- metal cylinder /
- blast load /
- failure mode
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表 1 实验装药条件
Table 1. Charge conditions in the expriments
Load d/(mm) Liningmaterial Liningthickness/(mm) Pulse widthof load/(μs) Peak pressureof load/(GPa) Load 1 1.9 2.5 19 Load 2 1.9 Copper 1.5 2.5 12 Load 3 1.2 1.0 19 -
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