Research On Burst Failure Of Typical Aeroengine Disk

Aeroengine disk was a key part of the aeroengine.Aeroengine disk bear complex load in the working state.The phenomenons of disk burst were mostly non-inclusive which always cause catastrophic consequences.Areoengine should possess good performance and sufficient margin to avoid the occurrence of disk burst.Meanwhile,reducing the quality of aeroengine disk as far as possible on the basis of guaranteed strength to improve the thrust-weight ratio of aero-engine.Therefore,accurate prediction of aero-engine(disk burst speed)had important significance.Integral disk is the typical structural parts in the next generation of high thrust aero-engine.Based on the present study,the burst speed prediction of a integral disk with drum structure and a integral compressor disk were studied deeply.The main works and research contents of this dissertation are listed as follow.1.The tensile experiment study of typical disk material TC17 was carried out.Tensile true stress-strain curve which in room temperature and in 200? was obtained.The test results show that,TC17 occured plastic deformation before the tensile fracture.With the increasing of the load,the plastic deformation gradually increase until the material fracture failure.Throu the electron microscope scanning of the fracture of tensile specimen,the fracture form of TC17 was a ductile fracture.2.Using elastic-plastic finite element method to analyze the stress and strain of the disk in specific speed according to the material data obtained by tensile performance test.According to the result of finite element analysis,obtained the stress,the diameter increase and the three-axis change of the stress at the dangerous cross section of the disk.The study show that,the method of finite element could solve the stress and strain of the disk more comprehensive.In future,the method of FEA could be used in areoengine design effectively.The increasing of diameter had more than the limit value.In the process of aeroengine design,the limit of diameter increasing and burst failure shoud be considered comprehensively.3.Designing a system to test the disk surface strain-temperature in rotating state.Conducted the surface strain test of a integral disk with drum structure.Obtained the strain value of the test point during the test.The experiment verify the accuracy of the finite element analysis result and analyzes the causes of the error in the test system.Successfully accomplished tested the surface strain of a real integral disk in high speed rotating(22800r/min).4.Conducted disk over-speed and burst-speed experiments on a integral disk with drum structure and a integral compressor disk.The experiments verified the accuracy of finite element analysis based on the test results.Through the experiment,the residual deformation-speed relationship was obtaind.At the same time,real disk burst speed and the instantaneous situation of disk burst were learnt.The same type of structure of the disk in the same test conditions could be different test results.The over-speed and burst-speed experiments of TC17 integral disk were accomplished sucessfully.The burst speed reached up to 30720r/min.Similar tests were studied few at present in domestic.Which provide effective theoretical and experimental reference for structural strength design of aero-engine.