Metal tube bending fatigue test device and method capable of controlling stress on line

Abstract

The invention discloses a metal tube bending fatigue test device capable of controlling stress on line. The metal tube bending fatigue test device comprises a driving motor, a driving eccentric unit and a supporting unit, wherein the driving eccentric unit comprises a driving shaft, one end of the driving shaft is connected with a rotating head, and a sliding plate base is arranged at the center of the rotating head and matched with the rotating shaft in a radial direction; a tool clamp is connected with the sliding plate base through a rotary support; the driving shaft is matched with an auxiliary supporting seat, and a synchronous belt wheel is further connected to the driving shaft in a screwed mode; the synchronous belt wheel is matched with a servo motor arranged on the rack through asynchronous belt; the driving eccentric unit further comprises a screw sleeve and a nut sleeve which are screwed on the outer side of the driving shaft, the nut sleeve is fixedly connected with the synchronous belt, the front end of the screw sleeve is connected with a telescopic rod on the rotating head, and the end of the telescopic rod is matched with the upper slope of the sliding plate base;and the sliding plate base, a spring pin and the telescopic rod are matched to form an eccentric adjusting mechanism. According to a scheme in the invention, the structure of the device is simple, and the problem that the stress cannot be adjusted online is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of bellows detection devices, and in particular relates to a metal pipe bending fatigue test device and method capable of controlling stress on-line, and is particularly suitable for rotating bending stress fatigue tests of ferrule joints and pipelines with radial load control. Background technique [0002] Stress fatigue is also called "high cycle fatigue". High cycle fatigue refers to the fatigue process of a small sample with a fatigue fracture life of 100,000 cycles during a variable load (stress) test. Since the alternating stress levels applied in this kind of fatigue are all within the range of elastic deformation, theoretically speaking, both stress and strain can be controlled in the test, but it is easier to control the stress than the strain in the test method. many. Therefore, high cycle fatigue tests are carried out under controlled stress conditions, and the maximum stress of the material o...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a metal pipe bending fatigue test device and method that can control the stress on-line, so as to solve the problem that the existing rotary bending online stress fatigue test technology cannot automatically implement the limitation of constant stress value, and the problem of high life of the equipment

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