A Calculation Method of Thread Connection Strength Based on Beam-Spring Model

Abstract

The invention discloses a method of computing threaded connection strengthbased on a beam-spring model. The method comprises the following steps of: firstly, establishing a reasonable threaded connection beam-spring simplification model by utilizing stress balance, deformation state, boundary conditions and deformation continuation / coordination conditions of the threaded connection; secondly, solving the beam-spring model to obtain stress and deformation conditions of the beam-spring model; and at last, reducing the stress and deformation conditions of the beam-spring model to the original threaded connection state so as to establish amethodforsolving stress distribution of each threaded connection toothand for computing the threaded connection strength based on the beam-spring model. According to the invention, the original solid model is greatly simplified, and a reasonable and operable mechanical model is established, so that the strength conditions of a threaded connection piece can be analyzed and checked through the model other than a solid; in comparison with the conventional modeling method, the mechanical model is closer to the solid model, higher in simulation and computational accuracy, and wider in application.

Description

Technical field [0001] The invention is suitable for the analysis of the force distribution of each tooth of the threaded connection, to check whether the strength of the threaded connection meets the standard, and can be used to guide the optimization of the force distribution of the threaded connection by changing the tooth profile and material parameters, thereby improving the connection Carrying capacity. Background technique [0002] Threaded connections are widely used in various industrial sectors. According to data, the United States alone will produce 100 billion threaded connections a year. There are two main problems in the use of threaded connections, which have not been well resolved at present, namely the fatigue failure and self-loosening of bolts. [0003] For different load forms, the bolt failure forms are very different. The damage of the tension bolt under static load is mostly the plastic deformation and fracture of the thread part; the fatigue fracture of th...

AI Technical Summary

Problems solved by technology

These studies have improved the unbalanced force on each tooth of the bolt to a certain extent, but there is no concise and effective theoretical model to analyze the force on each tooth of the thread and provide theoretical guidance and reference for tooth shape optimization.

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