Shear Fractures of LY12 Aluminum Cylinder under High-Strain-Rate Implosive Loading

In this paper, the shear fracture performances of LY12 aluminum cylinder were studied under explosive loading. The recovered fragments showed shear characteristics. The fracture surface formed along the maximum shear stress curves. SEM images of the recovered fragments illustrate that the fracture surfaces have undergone friction. The adiabatic shear bands and microcracks all initiate near the inside wall and develop along the maximum shear stress curves to the outside wall of the cylinder. The histories of stress and strain from numerical calculations indicate the adiabatic shear bands initiate more easily near the inside of cylinder than in other zones, which corresponds to the results of metallographic analysis.