Axially-stressed pre-tightening bolt connection strength experiment table and experiment method thereof

Abstract

The invention discloses an axially-stressed pre-tightening bolt connection strength experiment table and an experiment method thereof. The experiment table and the experiment method are used for stress and deformation detection and strength analysis of axially-stressed pre-tightening bolts. The experiment table comprises a bolt connecting structure and a loading device. The connecting structure is sequentially provided with a sensor A, a lower steel plate, a connected piece, an upper steel plate and a sensor B from bottom to top, and an experiment bolt penetrates through the lower portion of the base and is pre-tightened. A linear bearing structure is adopted for connecting and positioning, so that the influence of friction force and additional bending moment on bolt stress is reduced, and the loading precision of pure axial load is improved. The loading device comprises a lever with an elastic structure, a transmission unit and a sensor C, and manual loading of static load is realized through screw transmission, the motor drives an eccentric cam to rotate to realize continuous dynamic loading, and the deformation amount of an elastic piece is controlled through the eccentric amount of the cam to ensure the variable load loading precision. The experiment table connecting pieces can be flexibly interchanged, and the experiment table is suitable for engineering cognition experiments in the field of mechanical part strength and bolt fatigue strength testing experiments in the engineering field.

Description

technical field [0001] The invention belongs to the technical field of teaching experiment benches, and in particular relates to an axially stressed pretightening bolt connection strength experiment bench and an experiment method thereof. Background technique [0002] As a widely used fastener, bolts are required to have high connection strength and reliability. The analysis of the bolt connection strength, that is, the study of the factors affecting the bolt strength and the measures to improve the bolt strength, is of great significance to improve the reliability of the bolt connection. Among them, the tight bolt connection that bears the preload and working tension is the most common and the most important form of force. In the practical teaching of the "Mechanical Design" series of engineering courses in colleges and universities, the force analysis principle and fatigue strength calculation method considering deformation are universal, and they are typical analysis exa...

AI Technical Summary

Problems solved by technology

The existing bolt test bench uses resistance strain gauges to measure stress and strain, and needs to be equipped with an additional A / D conversion and signal amplification test system. The equipment debugging is complicated, the detection parameters are not comprehensive, the data error is large, the experimental results are not accurate enough, and the experimental requirements for clear theoretical verification cannot be met.

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