Metal pipe pure bending deformation test device and test method thereof

Abstract

The invention discloses a metal pipe pure bending deformation test device and a test method thereof. The metal pipe pure bending deformation test device comprises a reaction frame, a frame, a hydraulic type double-acting jack, a loading component, a hydraulic pressure station, a data acquisition component and a computer terminal. The metal pipe pure bending deformation test device is characterized in that a U-type groove bearing is assembled on each of connecting shafts of a chain wheel and a balance wheel in a driving wheel component of the loading component, and curvature radius of a groove arc of each U-type groove bearing is consistent with that of the wall surface of a metal pipe which is to be subjected to pure bending test. During test, two ends of the metal pipe are held by groove arc surfaces of the U-type groove bearings in a 360-degree fitting manner, non-radial external force borne by the metal pipe is small, bending deformation approaches to a pure bending state, and accordingly small system errors are achieved; a bending deformation link is automated, so that accidental errors are avoided. The metal pipe pure bending deformation test device is simple and compact in integral structure, and test operation is facilitated.

Description

technical field [0001] The invention relates to a metal pipe bending test device and an experimental method thereof, in particular to a metal pipe pure bending deformation test device and an experimental method thereof. Background technique [0002] The bending resistance of pipeline is the most critical performance index to measure its service life and reliability, and is an important basis for pipeline design and manufacture. [0003] In the prior art, there is no mature test device dedicated to pure bending deformation of pipelines. In the process of testing the bending performance of pipelines, experimenters usually use the three-point or four-point bending test method suitable for solid-web cross-section members. Such experiments slowly apply pressure to the pipeline wall through one or two rigid loading devices. And record its bending moment-curvature relationship during the loading process. [0004] However, this experimental method usually causes a certain amount o...

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Problems solved by technology

[0004] However, this experimental method usually causes a certain amount of local plastic deformation at the contact point between the loading end and the pipe. For thin-walled pipes, this local plastic deformation will exceed a certain limit, which will lead to local failure of the structure before the overall bending failure of the pipe. , cannot accurately reflect the overall bending performance of this type of pipe

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