Steel wire fretting fatigue testing machine and method

Abstract

The invention relates to a steel wire fretting fatigue testing machine and a method. The testing machine mainly comprises a horizontal loading device, an axial clamping device and an axial tensile compression device, wherein the horizontal loading device consists of a concave horizontal support saddle, a guiding support saddle, a wedged slide block, a loading steel wire, a pressure sensor, a loading rod and a locking nut; the axial clamping device consists of a spoke-type tensile compression sensor, a threaded rod connected with the spoke-type tensile compression sensor and an upper holding block fixed on the threaded rod; and the axial tensile compression device consists of an oil cylinder, a threaded rod connected with the piston of the oil cylinder and a lower holding block fixed on the threaded rod. The steel wire fretting fatigue testing machine has the advantages that by exerting horizontal set load on an axial steel wire through the horizontal loading device and by acting axial fatigue stress on a steel wire sample through the axial clamping device and the axial tensile compression device, the testing machine realizes fretting fatigue test of the coaction of fretting wear and axial fatigue stress of the steel wire sample; dynamic adjustment of the concave horizontal support saddle ensures that an axial fatigue steel wire does not generate bending stress; moreover, fluctuation ranges of both amplitude and frequency are wide and easy to control and measure by utilizing computer program.

Description

technical field [0001] The invention relates to a testing machine and method, in particular to a steel wire fretting fatigue testing machine and method for studying the steel wire fretting fatigue state. Background technique [0002] Steel wire rope has good bending flexibility and load-bearing capacity, so it is widely used as traction cable for transportation machinery, hoisting cable for mining machinery, support cable for passenger cableway, load-bearing steel cable for cable-stayed bridge, etc. The bearing strength and service life of steel wire rope Longevity is very important to the safe operation of these application equipment. During the operation of these equipment, the steel wire rope is subject to repeated stretching and bending and dynamic loads, so that the internal strands of the steel wire rope and between the steel wires are subject to fretting wear of different fretting amplitudes, and they must also withstand alternating vibrations. stress. Smaller frett...

AI Technical Summary

Problems solved by technology

[0004] Among the above-mentioned testing machines, the fretting friction testing machine and the fatigue testing machine of the sample are all single-type testing machines, and the axial fatigue test method and device of superimposed wear load are reducer structures, which are suitable for shaft test pieces. There is no testing machine that integrates fretting friction and wear between steel wires and axial fatigue and has a simple structure.

Images