Test sample and method for testing performance parameters of pipe under complex stress state

Abstract

The invention relates to a test sample and method for testing performance parameters of a pipe under the complex stress state. A common uniaxial tension arc-shaped test sample is processed into an arc-shaped test sample with an elliptical hole. The center line of a long shaft of the elliptical hole is in superposition with a center line in the length direction of the uniaxial tension arc-shaped test sample; and the center of the circle of the elliptical hole is in superposition with the center of the shape of the arc-shaped tension test sample with the elliptical hole. Two sections of pipe compressed test samples are cut out along the axial direction of the pipe to be tested. The verticality of the cross section of each pipe compressed test sample to the axial line of the pipe is 0.08-0.1, and the degree of roughness of the cross section of each pipe compressed test sample is 0.8-0.2. The tension testing is performed on the arc-shaped tension test sample with the elliptical hole, the axial compression testing is performed on the pipe compressed test samples, the lateral compression testing is performed on the pipe compressed test samples and reverse engineering is further performed on obtained force-displacement data, thereby testing the performance parameters of the pipe under the complex stress state.By adopting the whole set of test sample for testing the performance parameters of the pipe under the complex stress state and the testing method, the testing precision and the efficiency of the performance parameters of the pipe are improved.

Description

technical field [0001] The invention relates to a sample and a testing method for testing mechanical performance parameters of pipes under complex stress states in the technical field of pipe plastic processing. Background technique [0002] Due to the ability to meet the urgent requirements for light weight and toughness of products, tubular components have been increasingly valued and applied in high-tech fields such as automobiles, aviation and aerospace. During the forming process of hydraulic bulging and numerical control bending, the plastic flow and deformation behavior of pipes are very complex, and the pipes are loaded with complex stresses of bidirectional tension / compression. In order to formulate reasonable process parameters and achieve accurate numerical modeling analysis, it is urgent It is necessary to obtain accurate material performance parameters that can reflect the bidirectional tension / compression stress state of the pipe. [0003] At present, the meth...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the existing samples and testing methods in the prior art cannot accurately and comprehensively obtain the performance parameters of the pipe under the complex stress state, thereby affecting the design of the plastic forming process of the pipe and the accuracy of the finite element numerical simulation analysis of the forming process, the present invention proposes A sample and test method for testing performance parameters of pipes under complex stress state

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