Threaded connection structure loosening failure judgment method

Abstract

The invention relates to a threaded connection structure loosening failure judgment method, which comprises the following steps of S1, collecting factors influencing rotation loosening, and taking thefactors as input variables of an agent model; s2, determining a sample space according to the input variable, and extracting a plurality of sampling points in the sample space; s3, dividing each sample point into a plurality of groups, and then performing analyzing to obtain the friction force and the shear stress of each node on the supporting surface and the threaded surface of each group of sample points; s4, establishing a function fitting relationship with the radius and the included angle through the obtained friction force and shear stress; s5, calculating a rotating torque and a frictional resistance torque generated by the supporting surface and the threaded surface according to the function fitting relationship, and taking the rotating torque and the frictional resistance torqueas output responses of the agent model; and S6, constructing an agent model according to the input variable and the output response, and predicting whether rotational loosening and critical rotational loosening occur or not by the agent model. According to the invention, the anti-loosening performance and the loosening failure state of the threaded connection structure can be accurately detected.

Description

technical field [0001] The invention relates to the technical field of failure analysis, in particular to a method for judging the looseness and failure of a threaded connection structure. Background technique [0002] The loosening process of threaded connection structure can be divided into material loosening and rotational loosening according to the loosening mechanism. Material looseness is caused by the loss of axial force caused by the embedded and local plastic deformation of the contact surface between the fastener and the connected part under load. After a certain period of time, the embedded and plastic deformation are in a stable state, and the material loosening will not continue to occur ; When the load reaches a certain critical value, or the contact state between the thread and the bearing meets certain conditions, relative slippage will occur, and the fastener will undergo self-rotation loosening, which is called rotational loosening. [0003] With the in-de...

AI Technical Summary

Problems solved by technology

Due to the complexity of the loosening mechanism and influencing factors of the threaded connection structure, there is still no general model with simple form and accurate prediction that can determine the critical rotational looseness of the threaded connection structure, resulting in the inability to accurately detect the anti-loosening performance and loosening failure state of the structure. Unable to guide and standardize the manufacturing, design and assembly of fasteners and connected parts in engineering practice

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