Metal diaphragm bending fatigue measurement device and method for diaphragm compressor

Abstract

The invention relates to a metal diaphragm bending fatigue measurement device and method for a diaphragm compressor, provides a simple and easy bending fatigue measurement method for a metal diaphragm with a thickness of smaller than 1mm, and aims to make a bending fatigue test on the metal diaphragm on a tension-compression fatigue tester. A test clamping device consists of a base, a clamping block and a chuck, wherein a sample is fixed by the base and the clamping block; the middle of the sample is clamped by the chuck; the sample is processed into a middle-arc shape, so that the middle of the sample can be fractured. A fatigue tester program is designed, displacement amplitude is positioned for test, and stress variations are observed to judge whether the sample is fractured or not to obtain fatigue cycle data. An elastic mechanics mechanism is used for calculating a corresponding stress value by virtue of displacement amplitude, thereby obtaining a corresponding relationship between stress amplitude and a fatigue cycle. The method is simple in design and convenient to use, and is used for testing the fatigue resistance of the metal diaphragm of the diaphragm compressor.

Description

technical field [0001] The invention belongs to the technical field of fatigue testing of practical metal materials, in particular to a device and method for measuring bending fatigue of a diaphragm compressor metal thin film. Background technique [0002] Diaphragm compressor, also known as membrane compressor, is a type of reciprocating compressor in positive displacement compressor, which uses hydraulic drive to drive the diaphragm. Composed of a hydraulic system and a gas compression system, the positively moving piston makes the hydraulic oil impact the bottom of the diaphragm, squeezes the cavity, and discharges the process gas. The metal diaphragm is clamped between two high-precision fixtures, surrounded by a sealing roll and fastened with bolts, which has good sealing performance; the air cavity part in the diaphragm cavity does not need to be lubricated, so that the compressed gas is not polluted; and High pressure compression can be achieved. It has been widely ...

AI Technical Summary

Problems solved by technology

In the conventional fatigue test, the three-point bending test cannot realize the symmetrical bending load of R=-1, and the sample used in the bending fatigue test using the universal fatigue test machine is a cylindrical sample; the ultrasonic fatigue test sample also has a certain influence on the sample size Certain requirements, too thin samples cannot achieve resonance

There is no ready-made method for performing symmetrical bending fatigue tests on special profiles such as membrane sheets

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