NUMERICAL SIMULATION OF A THIN PLATE IMPACTED BY BLADE PROJECTILE

To study the aeroengine containment capability of the case for high-speed released blade, numerical simulations of the blade project impact thin plate with the variation of a yaw angle and an initial velocity are done. The constitutive material model and the fracture model criterion proposed by Johnson and Cook, which takes into account the effect of strain rate, stress triaxiality and temperature on the equivalent strain, are used in the numerical simulations. The effects of a yaw angle and an initial velocity on the deformations, failure patterns and faded energy changing of the blade and the plate are analyzed. It is shown that with the increase of the yaw angle, the main failure mode of the plate changes from adiabatic shear band to tearing, the failure area and ballistic limit velocity are also increased, and the deformation pattern of the blade plate changes from head upsetting to whole bending. The results could be referenced to further understand the damage mechanism of the released blade impact on the outside case, and to improve the design method for the blade containment in turbofan engine.