Global control method and device for damage and fracture of integral wallboard structure

Abstract

The invention discloses a global control method and device for damage fracture of an integral panel structure, and relates to the field of aircraft structure damage tolerance design, and the method comprises the steps: building a global damage parameter matrix of the integral panel structure; determining a control constraint; selecting a first group of parameters, and establishing a three-dimensional shell finite element model containing at least three rib integral wallboard structures according to the first group of parameters; simulating a crack propagation track by using a finite element method based on the reinforced area and unit, and obtaining a change curve of the stress intensity factor along with the crack length; according to the change curve, calculating the crack propagation life, the residual strength value and the weight under the first group of parameters; judging whether the crack propagation life, the residual strength value and the weight meet preset conditions or not; and if any one does not meet the preset condition, returning to the step of selecting a second group of parameters. According to the method and device, the crack propagation speed is delayed to the maximum extent, the damage tolerance performance of the whole wallboard is improved, and rapid iteration of optimization design is guaranteed.

Description

technical field [0001] The invention relates to the field of damage tolerance design of aircraft structures, in particular to a global control method and device for damage and fracture of an integral panel structure. Background technique [0002] Due to the advantages of good fatigue performance, simple manufacture and light structure weight, the integral panel has been applied in many medium and large aircraft structures. However, compared with the traditional riveted siding, the integral siding lacks the natural crack arresting element—the rivet connecting the stringer and the skin, which makes the damage tolerance performance poor. In view of this shortcoming, domestic and foreign scholars and designers Our research focuses on how to improve its damage tolerance performance as much as possible so as to meet the design requirements of aircraft damage tolerance and achieve the purpose of safety. [0003] At present, the main problem in the research and design of the damage...

AI Technical Summary

Problems solved by technology

However, compared with the traditional riveted siding, the integral siding lacks the natural crack arresting element—the rivet connecting the stringer and the skin, which makes the damage tolerance performance poor. In view of this shortcoming, domestic and foreign scholars and designers Our research focuses on how to improve its damage tolerance performance as much as possible so as to meet the design requirements of aircraft damage tolerance and achieve the goal of safety.

[0003] At present, the main problem in the research and design of the damage and fracture of the overall panel is: only consider the detail control, that is, under the assumption that the global parameters remain unchanged, only the shape and size of the ribs are optimized, which is only the overall panel damage. One aspect of tolerance design, without a global perspective, it is easy to spend more design and iteration cycles

Images