Clamping Straight Measuring Method for Measuring Residual Stress of Bending Strips by Cutting Strip Method

Abstract

The invention solves a problem that a conventional sectioning method is difficult to obtain the residual stress of a steel member accurately, and discloses a straightening measurement method for measuring the residual stress of a bent strip through a sectioning method. A measuring platform made of marble and a plurality of C-shaped clamps are prepared firstly, wherein the measuring platform comprises a substrate part and a flange part. The upper surface of the substrate is a horizontal plane A. The flange part is a cuboid-shaped strip block which extends on the horizontal plane A. A side surface of the flange part is perpendicular to the horizontal plane A, and is marked as a vertical plane B. The method comprises the steps: placing a cut steel bar on the horizontal plane A in a process of measuring the longitudinal residual stress of the steel member through employing the sectioning method, and enabling one side of a steel bar to be close to the vertical plane B; clamping the steel bar and the substrate part and the flange part through employing the plurality of C-shaped clamps, and measuring the scale distance L of the steel bar; and enabling the measured scale distance L to serve as the basis for calculating the longitudinal residual stress of the steel member.

Description

technical field [0001] The invention belongs to the field of mechanical measurement (G01L measuring force, stress, torque, work, mechanical power, mechanical efficiency or fluid pressure). Background technique [0002] There are many methods for testing the residual stress of steel components, and each has its own advantages and disadvantages. Among them, the strip cutting method has been widely used in steel components since the 1940s because of its simple principle, easy operation, high accuracy, and economical feasibility. In the measurement of component longitudinal residual stress, it is often used to measure the accuracy of other measurement methods. In the existing "strip cutting method", the steel member is usually drilled and positioned along the thickness direction, and then the section of the member is divided into long and thin strips along the longitudinal direction of the member, so that the longitudinal residual stress inside the section can be fully released....

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the residual stress of the steel member is difficult to obtain accurately due to unpredictable deformation in the process of the existing strip cutting method

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