Bolt safety coefficient checking simulation method

Abstract

A bolt safety coefficient checking simulation method comprises the following steps: simulating bolt holes of two sheet metal parts needing to be connected through a rigid unit, and establishing a rod unit to simulate a screw of a bolt; numbering each bolt bar unit needing to be checked in the whole model; extracting two shearing forces and one axial force of each bolt, selecting the type and grade of the bolt, and checking the tensile strength of the bolt through the axial force corresponding to each bolt; through finite element software simulation, calculating the slip limit and the slip load, and calculating the anti-slip safety coefficient; and calculating the bolt stretching safety coefficient through the extracted bolt axial force and allowable load. By checking the safety coefficient of the bolt, digitalization, parameterization and accuracy of bolt safety checking and model selection are realized.

Description

technical field [0001] The invention relates to a bolt safety factor check method, in particular to a bolt safety factor check simulation method. Background technique [0002] Batteries, electric motors, and engines are major sources of critical components on vehicles. For example, the weight of a general battery pack is more than 200-300kg. When fixing the battery on the frame, R&D workers often focus on the strength of the battery pack bracket and the frame, while ignoring the bolts of the connecting parts on the battery pack bracket. security issues. This will lead to two situations when the bolts on the battery bracket are selected: the bolts are too large or the bolts are not selected enough. If the bolt size is too large, it will cause the frame to expand, but the frame is often a standard hole, not only the bolts are overkill, but also increase the strength risk of the frame caused by the frame expansion; if the bolt size is too small, it is easy to cause the bolt t...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention proposes a bolt safety coefficient check simulation method, which can effectively and more reasonably select the bolt type, realize the digitalization of the bolt type selection, and realize fast simulation calibration of a large number of bolts in advance Nucleation and optimization, fast and accurate, that is, the accurate selection of bolts can be placed in the design stage to avoid the problem of oversized or undersized bolts in the later stage

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