High temperature composite fatigue loading method and apparatus for turbine disc/blade joggled joint

Abstract

A turbine disc/blade tenon connection high-temperature combined fatigue loading device comprises a low cycle load stress application mechanism, a force transmission pin, a force transmission main tension plate, a force transmission crown plate, a force transmission round bar, a blade clamp, a rolling bearing, a hold-down bolt, a high cycle transmission plate, a high-frequency heating cycle, and a vibration generator, wherein, the low cycle load stress application mechanism is connected with the force transmission main tension plate through the force transmission pin; the force transmission main tension plate is connected with the force transmission round bar through the rolling bearing; the lower end of the force transmission crown plate is sleeved on the force transmission round bar, and the upper end is connected with the load bearing dummy club of the blade clamp through the rolling bearing; the blade clamp is connected with the blade of a turbine through the hold-down bolt; the turbine disc is connected with the low cycle load stress application mechanism through the force transmission pin; the high cycle transmission plate is connected with the blade clamp through the hold-down bolt; and the vibration generator is positioned on one side above a high cycle load transmission plate. The loading method is characterized in that the force application point of low cycle loads is moved backwards, thereby enabling small high cycle loads to be smoothly transferred to the tenon connection position, ensuring the stress distribution along the tenon tooth is reasonable, and preventing combined loads from interfering with each other.

Description

(1) Technical field [0001] The invention relates to a loading method and device for aero-engine components, in particular to a high-temperature composite fatigue loading method and device for a turbine disk / blade tenon joint, belonging to the technical field of aerospace. (2) Background technology [0002] Aeroengine turbine disks and turbine blades are usually made of fir-tree joints, and the reliability of the tenon joint structure is the bottleneck that limits the life, safety and reliability of aircraft and engines. The reason is that the mortise groove of the turbine disk / blade mortise teeth is the stress concentration part, which is very prone to cracks. If the crack exceeds the standard, it will be scrapped; The nature of the crack in the mortise joint belongs to the composite fatigue of low-frequency large load (mainly centrifugal force) superimposing high-frequency small load (mainly high-cycle blade bending vibration load) at high temperature. Therefore, using rea...

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Problems solved by technology

The problem with the traditional method of applying high-temperature composite loads to the tenon joints of real turbine disks/blades is that when low-frequency centrifugal large loads are applied to the tester, the small loads of high-freq

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