Double Metal Casing Simulation Inclusive Experiment And Numerical Analysis

The aero-engine casing containment is one of the important specifications of safety and reliability for aero-engines. In the typical metal aero-engine casings, the high-pressure impressor casings and turbine casings are all double-layers structure, while the fan casings and low-pressure impressor casings are single-layer structure. So, the research on single-layer and double-layers casings containment, guide the engineering design and improve the ability of metal casing containment has important practical significance.In this paper, the metal casing containment mechanism are preliminary analyzed. The subject of simulated containment of double metal casing was studied. The simulated metal casing impact tests in the conditions of medium temperature was performed for the first time. 10 impact tests in different interlayer space of casing and different angle of attacks are completed in the gas breech facility. The limited penetration velocity and the main failure mode of the target was obtained.A numerical simulation method of composite material impact test which based on the impact test is established. The experimental results is numerically simulated by ANSYS/LS-DYNA. The Influencing factors of impact resistance (such as the layer distance, the target thickness distribution and the temperature) was submitted to analysis. The energy data achieved by calculating are in good accord with the experimental results. Some conclusions are obtained as follows: The containment of double-layers casing is better than single-layer casing; and the layer distance of double-layers casing shall greater than zero; The limited penetration velocity of double-layers casing is higher than the limited penetration velocity of single-layer casing in the condition of the total thickness of simulated blade and the target is always constant. The containment is the most marked when the layer distance equal 20, while the containment is weakest when the layer distance equal 0; If the inner layer casing is thicker than outer layer case, the system had the higher ability of containment.