Chuck, measurement system and measurement method for measuring circumference deformation of tube

Abstract

The present invention discloses a chuck, a sample tube, a measurement system and a measurement method for measuring circumference deformation of a tube. The chuck clamps a sample tube by adopting a profiling groove manner, and is loaded on arc positions of grooves on both ends of a gauge length section of the circular sample tube so as to measure the deformation of the standard distance section of the circular sample tube, wherein the circular sample tube is circumferentially stretched. With the present invention, the case that the displacement of the testing machine tension rod represents the whole deformation of the annular sample tube is avoided, the resulting data is more close to the real situation of the deformation in the aspect of reflection of circumference deformation of the sample tube, damages such as mechanical groove carving and the like are not introduced to the sample tube, and the integrity of the sample tube is ensured.

Description

technical field [0001] The invention belongs to the technology of pipe mechanics test equipment, and specifically refers to a chuck, a sample pipe, a measuring system and a clamping method for pipe circumferential deformation measurement. Background technique [0002] To determine the mechanical properties of pipes, it is necessary to obtain the data of pipe tension, especially the hoop tensile properties of pipes, which are more representative of the pipe bulging process. For small-sized thin-walled pipes, due to the small diameter of the pipe (minimum to Φ6mm) and thin pipe wall (minimum thickness of the pipe wall to 0.5mm) (such as zirconium tubes and titanium tubes commonly used in industry), it is not allowed to test In the middle, the method of notching or welding the boss is used to load the deformation measurement system on the sample, so it is difficult to measure the circumferential deformation of small-sized thin-walled pipes, and the difficulty is concentrated on...

AI Technical Summary

Problems solved by technology

For small-sized thin-walled pipes, due to the small diameter of the pipe (minimum to Φ6mm) and thin pipe wall (minimum thickness of the pipe wall to 0.5mm) (such as zirconium tubes and titanium tubes commonly used in industry), it is not allowed to test In the middle, the method of notching or welding the boss is used to load the deformation measurement system on the sample, so it is difficult to measure the circumferential deformation of small-sized thin-walled pipes, and the difficulty is concentrated on the clamping of the sample by the deformation system

[0003] In order to measure the hoop tensile properties of zirconium tubes, in 1999, Argonne Laboratory in the United States studied the hoop tensile properties of Zr-Nb tubes, but none of them mentioned the implementation of hoop deformation measurement.

[0004] Domestic data on measuring the hoop tension of small-sized pipes are very limited, and most of the measurement methods will cause notch damage to thin-walled pipes

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