Method for improving connection reliability of composite-material-based connecting member

Abstract

Provided in the invention is a method for improving connection reliability of a composite-material-based connecting member. The method comprises: step one, inserting a composite-material-based connecting member that is a bolt and has a thread light column section pasted with a strain gauge into a composite-material-based connecting member connection hole; step two, fixing a bolt head of the connecting member, screwing a nut into a bolt thread, and screwing the nut tightly preliminarily; step three, screwing the nut tightly based on a torque value predetermined by the test and monitoring a strain value of the strain gauge; step four, replacing a connecting member with the same specification, repeating the operation at least five times, and recording torque values and strain values monitoredin all tests; step five, based on the test values, determining a finite element simulation model meeting the precision requirement; step six, establishing a mapping relationship model between a tightening torque and a pre-tightening force; and step seven, according to the mapping relationship model of the tightening torque and the pre-tightening force, calculating a tightening torque corresponding to the pre-tightening force that is needed to be applied in the current composite-material-based connecting member connection process and carrying out screwing based on the tightening torque to realize reliable connection.

Description

technical field [0001] The invention relates to a method for improving the connection reliability of composite material connectors, which belongs to the field of precision assembly. Background technique [0002] Composite connectors are more and more widely used in aviation, aerospace, ships, automobiles and other fields due to their good mechanical properties. However, due to the complex preparation process of composite material connectors, the non-uniformity and anisotropy in structure and performance, the assembly tightening torque specification of traditional metal connectors is not suitable for composite material connectors, but for composite material connectors The assembly tightening torque specification is not perfect. Due to the high dispersion of composite material connectors, in practical applications, it is easy to break due to excessive torque or connection failure due to too small torque. Contents of the invention [0003] The technical problem of the prese...

AI Technical Summary

Problems solved by technology

However, due to the complex preparation process of composite material connectors, the non-uniformity and anisotropy in structure and performance, the assembly tightening torque specification of traditional metal connectors is not suitable for composite material connectors, but for composite material connectors The assembly tightening torque specification is not perfect

Due to the high dispersion of composite material connectors, it is easy to break due to excessive torque or connection failure due to too small torque in practical applications.

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