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High-pressure fatigue testing device and method

A fatigue test and test device technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of complex system, poor reliability, small flow rate, etc., and achieve low energy consumption, high reliability, and large driving force. Effect

Active Publication Date: 2015-05-20
HEFEI GENERAL MACHINERY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing hydraulic fatigue test device has shortcomings such as small flow rate, slow boosting pressure, complex system, and poor reliability, and needs to be improved urgently

Method used

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  • High-pressure fatigue testing device and method

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the implementation process of test device among the present invention is further described:

[0029] see figure 1 , This embodiment consists of a hydraulic unit, a pressure relief unit and a control unit.

[0030] Such as figure 1 As shown, a water tank 1 is set in the hydraulic unit, and a high-pressure water pump motor unit 5 is used as a power source. A high-pressure filter 3, a throttling and pressure regulating valve 15, a liquid supply check valve 7 and a high-pressure cut-off valve are sequentially set in the main hydraulic pipeline 1. Valve 22, the main hydraulic pipeline 1 is also provided with a manual pump end high-pressure cut-off valve 6 and a manual test piece end high-pressure cut-off valve 8 on both sides of the pipeline connected to the liquid supply check valve 7, which can control the pressure of the test vessel and the pressure test pump. The high pressure is manually unloaded.

[0031] The pressure ...

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Abstract

The invention relates to the technical field of a high-pressure fatigue test, and particularly relates to a complete high-pressure fatigue testing device and method in which the highest testing pressure is 70MPa. According to the high-pressure fatigue testing complete device and method provided by the invention, a large-flow high-pressure piston pump is used for directly pressurizing a test piece; after the value of a pressure reaches a set test pressure value, the pressure is kept for a certain period; a double-position three-way electromagnetic valve is switched to control an air cylinder to reset; an unloading valve is automatically reset to be switched on for unloading; when the value of the pressure reaches a lower limit pressure value, the pressure is kept for the certain period, and the pressure is increased again. With the adoption of the high-pressure fatigue test device and method provided by the invention, a pressure cycling processing of pressure increasing, pressure maintaining, pressure decreasing and pressure keeping can be completed, so that the cycle of stress when a high-pressure container or pipe piece is forced in work can be simulated; the one-time cycle is performed, and the test time is added by one until a set cycle time is reached or a test container is cracked, so as to effectively test whether the fatigue service life and the limit of the test piece can meet using requirements or not. The device has the advantages of being simple in system, high in reliability, good in simulation effect and the like.

Description

technical field [0001] The invention relates to the technical field of high-pressure hydraulic fatigue tests, and more specifically relates to a complete set of high-pressure fatigue test devices and test methods for pressure vessels, gas cylinders and pressure pipelines with a maximum test pressure of 70 MPa. Background technique [0002] High-pressure vessels and pipelines are widely used in petrochemical, hydroforming, mining, new material processing, military and other special occasions, and these high-pressure vessels or pipelines often have pressure fatigue during use. Therefore, the pressure on high-pressure vessels or pipelines The study of fatigue strength is of great significance. [0003] Although some universities and enterprises in China have developed 50MPa or 70MPa hydraulic fatigue test devices in recent years, the principle adopted is to use a supercharger as a pressure source and realize pressure control through a high-pressure electromagnetic reversing val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
Inventor 陈学东姚佐权秦宗川徐鹏崔军
Owner HEFEI GENERAL MACHINERY RES INST
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