A Prediction Method of Axial Compression Load Reduction Factor of Grid Slotted Shell

Abstract

The invention discloses a prediction method for an axial compression bearing reduction factor of a grid slotted shell. The method comprises the steps of building a finite element model corresponding to the grid slotted shell; applying a specified displacement load to a horizontal-vertical slotted intersection position of the middle of the grid slotted shell and performing static force analysis to obtain a non perfect structure model with an initial single-point recess defect; based on this, obtaining a defect sensitivity curve of a single-point recess degree to axial compression bearing, and a defect sensitivity curve of a single-point recess position to the axial compression bearing; and according to the defect sensitivity curve of the single-point recess degree to the axial compression bearing, and the defect sensitivity curve of the single-point recess position to the axial compression bearing, obtaining a predicted result of the axial compression bearing reduction factor of the grid slotted shell. According to the method, the prediction of the axial compression limit load reduction factor of the thin-walled grid slotted shell is realized, so that whether the axial compression bearing capacity of the shell meets design requirements or not can be determined.

Description

technical field [0001] The invention belongs to the technical field of structural strength design and analysis of tactical missiles, and in particular relates to a method for predicting an axial pressure bearing reduction factor of a grid slotted casing. Background technique [0002] The thin-walled structure has the characteristics of light weight and good load-bearing performance, and is widely used in the structural design of the rocket body compartment. In order to meet the laying requirements of the optical fiber for impact measurement, the metal shell of the final repair cabin and the instrument cabin of a certain type of target missile adopts a structural form in which optical fiber grooves are engraved on the outside of the optical tube shell. Compared with the traditional grid-reinforced and skinned stringer-type thin-walled structure, designers lack engineering experience in the mechanical load-bearing performance of this new grid-slotted shell, especially its stab...

AI Technical Summary

Problems solved by technology

However, this method still needs a lot of experimental verification to provide the probability density information needed to determine the reduction factor, and it is difficult to apply to the design requirements of rapid and low-cost tactical models

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