Method for measuring lateral residual stress of curved steel plate

Abstract

The invention discloses a method for measuring the lateral residual stress of a curved steel plate. A curved steel plate part with the length of 700mm and the width of 70mm is cut from one end of a to-be-measured curved steel plate and is used as a detection element; with the central point of the detection element as a symmetric point, strain gauges are pasted at positions respectively at distances of 100mm, 200 mm, and 300mm to two sides of the central point in a direction perpendicular to the axis of the detection element, wherein the length directions of the strain gauges are identical withthe length direction of the detection element; an initial value is measured and an instrument is reset; on the basis of a molybdenum thread cutting method, the detection element is cut off longitudinally at the central part of the detection element, a final residual stress value is measured, and then an average value is calculated and thus a lateral residual stress value of the curved steel plateis obtained. The method is simple; the strain gauge positions and the cutting position are selected reasonably; and the residual stress of the detection element can be measured quickly and accurately.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for detecting the transverse residual stress of a curved steel plate. Background technique [0002] Residual stress means that the component will be affected and affected by various processes and other factors during the manufacturing process; when these factors disappear, if the above-mentioned effects and influences on the component cannot disappear completely, there will still be some effects and influences on the component. If the influence remains in the component, the residual effect and influence are called residual stress or residual stress. [0003] Metal materials produce different residual stresses during machining and thermal processing (castings, weldments, forgings). The existence of residual stress has a significant impact on the mechanical properties of materials, especially in the process of manufacturing and heat treatment of welded parts. The exist...

AI Technical Summary

Problems solved by technology

The existence of residual stress, on the one hand, will reduce the strength of the workpiece, causing process defects such as deformation and cracking of the workpiece during manufacturing; on the other hand, it will reduce the mechanical properties of the material such as fatigue strength and stress corrosion during the natural release process after manufacturing

causing problems in use