Test device, test method and prediction method for tangential dynamic characteristics of bolted joint

Abstract

The invention discloses a test apparatus, a test method and a prediction method of bolting junction tangential dynamic characteristics. The test apparatus comprises a force tensile testing machine, an upper test piece, a lower test piece, bolts, strain gauges, a bridge, a dynamic strain indicator, a signal acquisition system and a computer. The upper test piece is fixed with an upper clamp of the force tensile testing machine, and the lower test piece is fixed with a lower clamp of the force tensile testing machine. The upper test piece and the lower test piece are fixed through the bolts. Each strain gauge is implanted at the centers of a screw axis of each bolt, and is connected with the bridge. The bridge is connected with the signal acquisition system through the dynamic strain indicator. Force and displacement of the force tensile testing machine are respectively sent to the signal acquisition system through a force sensor and a displacement sensor. The signal acquisition system is connected with the computer for transmitting the acquired bolt pre-tightening force and the data of the force and the displacement of the force tensile testing machine to the computer. The test apparatus is simple in structure, convenient for loading and unloading and easy to conduct repeated tests, and solves a problem that the retardation non-linear characteristic of the bolting junction is difficult to test.

Description

technical field [0001] The invention belongs to the field of mechanical design and manufacture, and in particular relates to a testing device, a testing method and a predicting method for the tangential dynamic characteristic of a bolt joint. Background technique [0002] The mechanical structure is a whole composed of many parts combined according to certain functional requirements, and bolt connection is one of the main forms. The structure connected by bolts is mainly composed of two parts: the joint surface and the bolted connection. Due to the nonlinear characteristics of the joint surface and the nonlinearity of the bolted connection due to factors such as clearance, dry friction, prestress, and initial deformation, the bolted connection structure has a great influence on the dynamic performance of the overall structure, and the mechanism is extremely complicated. There are many factors that affect the dynamic characteristics of the joint surface, and they are very co...

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Problems solved by technology

[0003] There are so many influencing factors, and their influencing laws are mostly non-linear, and the factors influence each other, so it is impossible to directly determine their influencing laws and degree of influence by means of theoretical analysis. Experimental research methods must be used to solve

In addition, due to the variety of bolt arrangements, it is difficult to obtain all the dynamic characteristics of bolted connection structures by experimental methods.

[0004] In order to predict the tangential dynamic characteristics of the bolt group structure with different bolt arrangements, and systematically study and prove the relationship between the tangential dynamic characteristics of the bolted connection structure and its basic influencing factors, a complete set of testing devices and methods are needed, and there is no such method yet. Correlation device for predicting tangential properties of bolted joints

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