Steel structure residual stress measuring instrument and using method thereof

Abstract

The invention provides a steel structure residual stress measuring instrument and a using method thereof. The measuring instrument comprises a fixed measuring conical head, a sliding measuring conicalhead, a metal support, a dial indicator, a clamping support and a buffer spring system; the clamping support, the fixed measuring conical head and the buffer spring system are all fixed to the metalsupport, the dial indicator is laterally placed on the metal support, and the thickness of a dial plate is close to or equal to the width of the metal support. The sliding measuring conical head can freely slide in the measuring head sliding hole of the metal support, the left end of the sliding measuring conical head is connected with the measuring rod end of the dial indicator, and the right endof the sliding measuring conical head abuts against the buffer spring system. The measuring instrument is further provided with a standard hole distance ruler and a temperature correction ruler whichare the same in structure and size, the standard hole distance ruler serves as a reference ruler, and the temperature correction ruler is used for correcting the influence of temperature change on the to-be-measured small hole distance. The measuring instrument is simple in structure, and can accurately measure the residual stress near the joint of the plates; the measuring restoring force is small, the measuring conical head cannot deviate from the center of the measuring hole, and the measuring precision is not affected.

Description

technical field [0001] The invention belongs to the technical field of steel structure stress measurement, and in particular relates to experimental research on the distribution of residual stress in a section of a steel structure, in particular to a steel structure residual stress measuring instrument and a use method thereof. Background technique [0002] Residual stress distribution is one of the important factors affecting the stability of steel structures, and has a very important impact on the fatigue performance, brittle fracture and stress corrosion of steel structures. The research on the residual stress distribution of component sections is one of the important research topics in the field of steel structures. At present, the cutting method is usually used to measure the residual stress distribution of steel structures. When using the cutting method to measure the residual stress of a steel structure, firstly drill several pairs of small holes on the steel member, ...

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Problems solved by technology

[0003] However, when using the cutting method to measure the residual stress of steel structures, the existing hand-held strain gauges cannot accurately measure the longitudinal residual stress near the junction of cross-section plates such as H-shaped steel, I-shaped steel, T-shaped steel, and angle steel, because The existing hand-held strain gauges are large in size and are limited by the measurement space. It is generally impossible to accurately measure the initial spacing of each pair of small holes near the intersection of the plates before the component is cut, so the accurate residual stress here cannot be obtained; Especially for sections with small cross-sections, the number of steel strips that can be cut on each plate is not much. If there are still some steel strips that cannot provide accurate residual stress measurement results, it will not be possible to obtain a reliable cross-sectional residual stress distribution in the end. ; Moreover, the stiffness of the spring used in the buffer system of the existing handheld strain gauge is too large, and the restoring force during the measurement is relatively large, which causes the measuring cone to deviate from the center of the measuring hole and affects the measurement accuracy

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