A kind of prefabricated test system and test method for aero-engine disc cracks

Abstract

The invention discloses an aeroengine wheel disc prefabrication test system and test method. The test system includes a tension sensor, a hydraulic actuator cylinder, a servo valve, a test controller, a support and a pedestal; an engine wheel disc is horizontally fixed on the pedestal through the support, and a steel wire rope I and a steel wire rope II are clamped in a mortise of the engine wheel disc, are vertical to a radius direction of the engine wheel disc, and apply tension to the engine wheel disc from opposite directions; the test steps are clear and feasible, the loading process is detailed, the crack property and crack direction of low cycle fatigue cracks of an aeroengine wheel disc can be truly simulated, and the crack state is consistent with that generated in an actual use process of the aeroengine wheel disc, thereby providing conditions for studying the residual life of a wheel disc expanding from a 0.76mm crack to a fracture. The method is also suitable for crack prefabrication of an aeroengine wheel disc wheel center.

Description

【Technical field】 [0001] The invention belongs to the field of aero-engine testing, and relates to an aero-engine disc crack pre-manufacturing test system and a test method. 【Background technique】 [0002] The wheel disc is the main load-bearing part of the aero-engine, and is one of the key parts of the engine. Due to the complex structure, large size, high speed, heavy load, and harsh working conditions of the roulette, once damaged, the non-containment rate is extremely high, which poses a serious threat to aircraft and personnel, and its safety and low cycle fatigue life must be scheduled. [0003] The low-cycle fatigue life prediction method of the wheel disc is to convert the load cycle of the wheel disc under the flight service condition into a "standard stress" cycle, determine the test conditions according to the standard stress cycle and the corresponding cycle number requirements proposed in the design, and introduce the tester coefficient to Indicates the differ...

AI Technical Summary

Problems solved by technology

Since the low cycle fatigue test method does not consider the crack growth rate, the remaining life of the disc from 0.76mm crack growth to rupture cannot be estimated, so it has to be scrapped

[0005] In order to study the remaining life of the roulette from the 0.76mm crack extension to the rupture, so that the scrapped roulette can continue to be used, it is first necessary to find the 0.76mm cracked roulette among the used roulettes and then conduct the low-cycle fatigue test. It is difficult to find in the wheel disc of the engine, so the research on the crack pre-production of the engine wheel disc was carried out

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