Finite element calculation method of separated interface connecting strength

Abstract

A finite element calculation method of separated interface connecting strength comprises the following steps that 1a whole three-dimensional finite element model of a lower butt-joint frame of a separated interface and a whole three-dimensional finite element model of an upper butt-joint frame of the separated interface are established and a separating nut is simplified into a beam unit; 2 the contact relationship between the lower butt-joint frame and the upper butt-joint frame is established and multi-point constraint relationships are established between one end of the separating nut and the lower butt-joint frame and between the other end of the separating nut and the upper butt-joint frame respectively; 3 calculation is submitted and the largest axis force of the beam unit and the largest shear force of the beam unit are output, wherein the largest shear force is the resultant force of shear forces, in two directions, of the beam unit; 4 a local model of a single connecting point on the separated interface is established and the mutual contact relationships between all parts are considered; S5 analysis steps are established and calculation is submitted; S6 post-processing is conducted on calculation results submitted in the 5 and stress and deformation of all the parts are obtained.

Description

technical field [0001] The invention relates to the technical field of aircraft separation, in particular to a finite element calculation method for connection strength of a separation interface. [0002] Background technique [0003] At present, there are mainly two methods for calculating the connection strength of point-type connection separation surfaces: one is engineering algorithm, and the other is finite element algorithm. For the engineering algorithm, when there are many connection points on the separation surface, it cannot accurately evaluate the unevenness of the force between the connection points. Therefore, the strength of the separation nut and the shear cone sleeve cannot be accurately calculated. However, the existing finite element method has to consider the mutual contact between various parts, which greatly increases the calculation amount, and even the calculation cannot be converged. [0004] The beam element is an existing one-dimensional idealize...

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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a finite element calculation method for the connection strength of the separation interface, which does not need to consider the complex contact relationship between the various components, greatly reduces the amount of calculation, and avoids the problem caused by the complex contact relationship. Due to the non-convergence problem caused by the problem, the calculation efficiency is improved; at the same time, due to the use of local models, the finite element grid can be divided finer, which improves the calculation accuracy

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