Reciprocating bending corrosion fatigue testing machine

Abstract

The invention discloses a reciprocating bending corrosion fatigue testing machine which manly comprises a steel frame, a power mechanism, eccentric wheel mechanisms and an adjusting bracket mechanism. An exciting motor with controllable rotation speed is connected with a speed reducer through a coupler; the speed reducer reverses by 90 degrees through the coupler to drive a rotation shaft to rotate; the rotation shaft is fixed in the length direction of the steel frame through a bearing pedestal; the five eccentric wheel mechanisms are arranged on the rotation shaft, and each eccentric wheel mechanism comprises an eccentric wheel as well as a bearing and a connecting rod which are sleeved outside; the stress of a sample can be adjusted through the eccentricity of the eccentric wheel; the connecting rod of each eccentric wheel mechanism is connected with one end of the sample through a T-shaped block, and the other end of the sample is fixed on a bottom plate of an adjusting bracket; the distance between the adjusting bracket and the rotation shaft can be adjusted to test the sample of different size; and the thickness of a gasket arranged between the sample and the bottom plate of the adjusting bracket can be adjusted to adjust the cyclic load stress ratio. The reciprocating bending corrosion fatigue testing machine has the functions of medium temperature control, motor start / stop control, automatic counting and remote alarm.

Description

Technical field: [0001] The invention relates to a testing machine for simulating corrosion fatigue of flexible structures in marine engineering, in particular to a corrosion fatigue testing machine capable of realizing simultaneous experiments on multiple samples. Background technique: [0002] As the exploration and development of global oil and gas resources enters deep water, the application of slender and flexible structures such as risers / risers, chain bundles, anchor chains, and submarine pipelines is increasing. The effects of various forces such as ocean currents, coupled with the drift of the connected floating drilling unit, make these structures in an extremely complex marine environment, and the main failure mode is corrosion fatigue. Designing and developing a suitable test device is of great significance for engineering material selection, corrosion fatigue failure mechanism research and safety evaluation. [0003] Some literatures believe that stress level, ...

AI Technical Summary

Problems solved by technology

However, the loading frequency of marine corrosion fatigue is generally lower than 1Hz, and the test period is too long. It is necessary to develop a multi-sample corrosion fatigue testing machine.

There are foreign literatures that use eccentric wheel loading to realize multi-sample simultaneous experiments, but it adopts belt transmission mode, and the transmission torque is small, so it can only be used for fatigue tests of low-strength thin-walled materials. At the same time, the stress ratio cannot be adjusted, and the medium temperature cannot be studied. Effect on Fatigue Properties

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