Assessing geometrically nonlinear behavior of the anisotropic structure short surface defects in composite panels under compression
Published: 11.04.2024
Authors: Mitrofanov O.V., Shkurin M.V., Dudchenko A.A.
Published in issue: #4(148)/2024
DOI: 10.18698/2308-6033-2024-4-2353
Category: Metallurgy and Science of Materials | Chapter: Powder Metallurgy and Composite Materials
The paper considers a problem of determining the stress-strain state at supercritical behavior of the short surface defects such as the anisotropic structure delamination in smooth composite panels under compression. It notes that when loaded with the compressive forces, defects of the δ thickness have a short rectangular shape (at b<a<1.5b). With stability loss and subsequent geometrically nonlinear behavior, they could have the oblique waves associated with the anisotropic structure. The presented analytical solutions to geometrically nonlinear problems were obtained by the Bubnov—Galerkin method. To study behavior of the short rectangular defects under consideration, two terms of the trigonometric deflection series were used. The paper analyses a variant of boundary conditions corresponding to the all-round hinged support. In each case, solution to the geometrically nonlinear problem is reduced to numerical solution of a system of two nonlinear equations in regard to the deflection amplitudes. To analyze the defects stressed state, analytical expressions for membrane and bending stresses are provided, as well as equalities to assess the transverse shear stresses arising in the geometrically nonlinear state.
EDN OIMVXI
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