High-low cycle compound fatigue test high-cycle amplitude measuring equipment and method

Abstract

Provided are high-low cycle compound fatigue test high-cycle amplitude measuring equipment and method. The equipment comprises a first low-cycle load stress application, a first stress transmission pin, a stress transmission main tension plate, a first pressing bolt, a blade clamp, a first stress transmission ejection plate, a high-frequency induction heating ring, a first rolling bearing, a stress transmission circular rod, a second stress transmission ejection plate, a turbine disc, a stress bearing convex lug, a second rolling bearing, a turbine blade, a second pressing bolt, a high-cycle load transmission plate, a second low-cycle load stress application mechanism, a second stress transmission pin, a vibration exciter, a needle tip and a telephoto microscope. The high-low cycle compound fatigue test high-cycle amplitude measuring equipment and method achieve the purpose that the amplitude of a blade tip can still be accurately measured even under a high temperature (200 DEG C).

Description

technical field [0001] The invention relates to the field of high-low cycle composite fatigue tests of mortise joints, in particular to a device and method for measuring blade tip amplitude in laboratory high-low cycle composite fatigue tests. Background technique [0002] The turbine is one of the core components of an aero-engine, and its life largely determines the life of the engine. The working environment of the mortise joint is very harsh. In addition to being impacted by high-temperature and high-pressure gas, it also bears low cyclic loads caused by centrifugal force and thermal stress, and high cyclic loads caused by aerodynamic loads on the blades. Therefore, the mortise and tenon joints are prone to fatigue cracks. [0003] In order to accurately determine the life of the tenon joint structure of the turbine, it is necessary to carry out the high and low cycle composite fatigue test of the tenon joint in the laboratory. To this end, the laboratory proposed a fu...

AI Technical Summary

Problems solved by technology

Generally, the displacement sensor can only measure the amplitude value of the object when the temperature is not high, but for the blade temperature in this test is about 200 ℃, and it is wrapped in the fixture, the traditional displacement sensor cannot measure the vibration amplitude of the blade tip at this time. There is an urgent need for a new method to accurately measure the tip amplitude

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