Experimental Study of Fragmentation Behavior of ExplodedTA2 Alloy Cylinders with Varied Charge

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.