Research on Failure Mode of GH909 Plate Under Simulated Blade Impact

Aiming at the typical material GH909 of aero-engine gas turbine casing, a flat target test piece was designed. The directional solidification cylindrical superalloy DZ406 simulated blade is used as the cartridge body to carry out the impact shooting test, and the details concerning deformation, failure mode and critical penetration velocity of GH909 plate under the impact of simulated blade were obtained. The test results show that, with the increased impact velocity, the deformation and failure of the plate will produce different failure modes, such as bullet deformation, critical breakdown, complete breakdown and so on. When the impact angle is perpendicular to the flat plate with 0 °, no cracks appear at low speed. When the impact speed is high, the impact part is torn, and two ends of the bullet mark extend to the vertical direction, creating four cracks. When the speed reaches a certain value, the blade penetrate the flat plate, and five cracks extend outward around the crater. When the impact angle is 45° to the flat plate, three T-shaped cracks appear in the plate under high velocity impact. The results have reference significance for the design of aero-engine casing containment design.