Method for predicting axial compression performance of foldable composite cylindrical shell

Abstract

A method for predicting the axial compression performance of a foldable composite material cylindrical shell comprises the following four steps: step 1, defining the geometrical shape and size of the foldable composite material cylindrical shell, and determining a mathematical expression of the relationship between geometrical parameters; step 2, applying an axial compression load to the foldable composite cylindrical shell in the step 1, and deducing critical buckling loads and load-displacement curves of a first stage and a second stage according to a classical Euler formula; step 3, according to a classic Euler-Bernoulli beam model, establishing a geometric equation and a physical equation for describing folding deformation of the foldable composite material cylindrical shell; the method comprises the following steps: establishing an analytical model for predicting a third-stage load-displacement curve and a shape function of the foldable composite material cylindrical shell by combining Macrourin series expansion, an orthogonal Chebyshev polynomial, a Galerkin method and a Harmonic balance method; and 4, deducing an analytical expression of the compression strength based on a minimum complementary energy principle, a classical laminated plate theory and a Tsai-Hill failure criterion.

Description

technical field [0001] The invention provides a method for predicting the axial compression performance of a foldable composite cylindrical shell, which belongs to the field of space navigation. Background technique [0002] Cylindrical shells, as one of the most basic structural units in engineering, have received extensive attention and research in the aerospace field because of their high-efficiency load-bearing properties and excellent functional structural design. Compared with the traditional isotropic cylindrical shell, the foldable composite cylindrical shell has the characteristics of light weight, high specific stiffness, high specific strength, good corrosion resistance, and good structural designability, and has a good application prospect. The increasingly severe service conditions make the external load conditions of the foldable composite cylindrical shell structure complex and changeable in the actual service process. Among them, the most typical load case i...

AI Technical Summary

Problems solved by technology

It is expensive to directly measure the axial compression properties of foldable composite cylindrical shells through experiments, and the test process is easily affected by many accidental factors.

Numerical simulation technology needs to establish a complex finite element model, the calculation is complex, the calculation efficiency is low, and the calculation accuracy is difficult to guarantee

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