Liquid oxygen environment fatigue testing system and method

Abstract

The invention provides a liquid oxygen environment fatigue testing system which is high in leak tightness and safety, and a method using the testing system. The testing system comprises a fatigue testing device, a liquid oxygen environment control unit, a liquid oxygen environment sealing unit and a liquid oxygen supply unit. The fatigue testing device comprises a rack, an electro-hydraulic servocontroller and the like, wherein the rack comprises a base, a plurality of supporting rods, a piston, an upper transverse beam and a lower transverse beam; the liquid oxygen environment control unit comprises a liquid oxygen environment box, a lifting machine, a liquid level sensor, a pressure sensor, a liquid supply electromagnetic valve and a release valve; the liquid oxygen environment sealingunit comprises a corrugated pipe. When a liquid oxygen environment fatigue test is carried out, the liquid oxygen environment box, the low transverse beam, the piston and the corrugated pipe form a sealed liquid oxygen environment, the liquid level sensor monitors the level of liquid oxygen, and it is ensured that the test is carried out in a stable liquid oxygen environment. The pressure sensor monitors gas pressure in the liquid oxygen environment box and maintains the pressure within a proper range, and dynamic sealing of the liquid oxygen environment is achieved through the corrugated pipe.

Description

technical field [0001] The invention relates to the field of material mechanical performance testing, in particular to a liquid oxygen environment fatigue test system for performing fatigue performance tests in a liquid oxygen environment, and a liquid oxygen environment fatigue test method for performing fatigue tests using the liquid oxygen environment fatigue test system. Background technique [0002] Liquid rocket engines have the advantages of high specific impulse, large thrust range, and can be started repeatedly. Now they have become the mainstream of space launch. At present, the high-thrust rocket engines vigorously developed in my country use liquid propellants, and liquid oxygen is the most important oxidant. The working conditions of the rocket propulsion system are extremely harsh, so it is necessary to test the mechanical properties of the materials of key components in a liquid oxygen environment to provide a basis for the design and maintenance of components....

AI Technical Summary

Problems solved by technology

However, when liquid oxygen is selected as the low-temperature environment medium, the sealing performance of the environment device must be considered to prevent the large amount of evaporated oxygen from causing oxygen poisoning to the test personnel, and causing the oxygen concentration in the test space to reach a dangerous concentration range to cause a fire; and because the liquid oxygen Oxygen has low temperature and strong oxidizing properties, and the materials in contact with liquid oxygen must be able to be recycled at low and normal temperatures without chemical reactions; in addition, during the test, there is relative motion between the piston and the environmental device, while Due to the particularity of liquid oxygen as a low-temperature medium, the existing dynamic sealing structure is no longer applicable

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