Research On Impact Resistance Of GH4169 Casing In The Form Of Stiffened Structure

Aeroengine turbine components have long been in a high-temperature and high-pressure working environment,which requires turbines to be well-capable.China has a special provision in civil and military aviation engine specifications to make strict regulations on inclusiveness.Turbofan engines must pass inclusive verification in order to obtain an airworthiness certificate.Turbine blades will be subjected to dynamic impact loads during the process of turbine blade break-off and fly-off.Therefore,it is critical to carry out dynamic mechanical tests and simulation calculations for casing materials.In order to study the inclusiveness of aero-engine turbines,the following work was done in combination with test work,mechanism analysis and numerical simulation for the GH4169 superalloy materials used in turbines:Through the air cannon test system,the target test of GH4169 superalloy reinforced target plate was carried out.Combined with the GH4169 superalloy target plate under the high-speed impact of the shrapnel and the impact process of high-speed photography,the target plate was analyzed.The rib structure design and the failure mode and failure mechanism at different impact speeds.The test results show that the impact resistance of the stiffened plate is better than that of the homogeneous target plate,and the absorbed energy of the target plate increases with the increase of the number of reinforcing bars.When the impact velocity of the projectile far exceeds the ballistic limit of the target,the impact resistance of the two reinforced reinforced target plates is the most excellent.The damage mode and plastic deformation of the reinforced target plate at different impact speeds are different.Relatively speaking,the reinforced target has the best containment performance when the impact velocity is close to the ballistic limit.The impact of yaw angle on containment performance cannot be ignored in specific engineering practice.(2)In order to study the influence of reinforced structure on the inclusive capacity,a numerical simulation model of the impacted reinforced structural metal target plate was established,and a reliable method was established by modifying the boundary conditions in the simulation calculation and the flight attitude of the missile.Simulation calculation method.The simulation results show that the impact resistance of the stiffened plate is better than that of the equal-thickness homogeneous plate.Under the reinforcement design,the stiffened structure of the multi-reinforced structure is better than the stiffened plate of the single-reinforced structure.It is recommended that the aero-engine turbine be inclusive.The area should be designed with a rib structure to enhance the containment capacity.When yaw impact,the casing capacity is better than the target plate is impacted by the same speed at the same speed.(3)Based on the numerical simulation of the blade impact reinforced structural target plate,the inclusive capacity of the reinforced structural machine ridge under relative real working conditions is analyzed.The calculation results show that the yaw of the projectile with the pitching flight attitude with the blade pitch When the angle is increased,the inclusive performance of the simulator is increased.When the pitch angle is small,the impact resistance of the simulator is not increased greatly,and the yaw of the small pitch angle when the blade is flying is dangerous to the containment performance of the casing.The same as the positive impact,it needs to attract some attention;the aerodynamic axial force has little effect on the capacity of the reinforced machine,and can be neglected in the calculation;when the numerical simulation is used to study the inclusiveness of the machine,the machine will be The boundary condition setting of the installation side node fixed will reduce the containment ability of the machine model used in the calculation;the mechanical load has a great influence on the machine inclusive calculation,and the axial pressure of the front and rear mounting machine for the impact machine The capacity of the simulated reinforced machine is increased,and the pressure difference of the middle casing of the machine under real working conditions will reduce the energy absorption of the casing for the flying blades.This will likely result in non-contained accidents in the flying blades.