Real-time observations on deformation and failure of LY12 samples under impact tension

In this paper, the real-time deformations and failures of LY12 samples loaded by an SHTB are investigated by an optical system, which consists of a high-speed camera, a flash lamp, a frame grabber and a synchronization device with the controlling accuracy of 1 microsecond. The deformation history of LY12 is obtained with a time interval of 10μs and the result is compared with that acquired by classic Hopkinson method at the same time. Besides, two different failure modes and the crack propagation velocity of LY12 specimen are detected in impact tensile process. The fracture textures after working are also surveyed by SEM and it shows that the dynamic fracture mode is affected by the microstructure of materials.