Tube wall plane indentation residual thickness expanding device for tube material mechanic performance test and test method

Abstract

The invention discloses a tube wall plane indentation residual thickness expanding device for a tube material mechanic performance test and a test method. The device comprises a pressure transmitter side plug, a liquid inlet side plug, a test tube section, a liquid inlet joint, a liquid inlet side sealing cushion, a pressure transmitter, a pressure transmitter side sealing cushion, a tube section support frame, a tube wall residual thickness expanding area, a linear displacement sensor, a displacement sensor locating frame, a pressurization liquid bath, a pressurization pump, a buffering tank, a data collecting system and a computer, wherein the tube residual thickness expanding area is in a rectangular plane indentation structure or a circular plane indentation structure. Through the tube wall plane indentation residual thickness expanding device, a maximum strain position is stabilized in the center of an indentation plane all the time from primary deformation to plastic drawing stability loss till breakage, so that the accurate location of measurement is facilitated; the measurement is easy, and a measurement strain range approximates to an overall range; the test device is simplified; the deformation is concentrated in a local area, so that only the shape and the position of a tube material and the displacement sensor are controlled; a complex clamping device is not needed; the test device is greatly simplified; the test is relatively safe.

Description

technical field [0001] The invention relates to the technical field of material mechanical performance testing, in particular to a test method for measuring the real stress-strain relationship of pipes with a large strain range. Background technique [0002] In many industrial fields, the application of lightweight parts is becoming increasingly heavy. Larger strain range and more accurate mechanical properties of pipes can significantly improve the accuracy of forming process parameters and the accuracy of numerical simulation results. [0003] At present, the uniaxial tensile test method is most used in the mechanical performance test of pipes, and the tensile specimens are cut along the pipe axis. The advantage of the uniaxial tensile test method is that the specimen is simple and the method is traditional. The main disadvantages are: 1) The measured stress and strain are average values ​​in a certain sense (extensometer gauge range or specimen gauge range); Behavior; 3...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies existing in the existing pipe mechanical performance test methods and propose a pipe wall plane retraction excess thickness bulging device and test method for pipe mechanical performance testing

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