To assess the stability and postbuckling behavior of thin composite panels with additional repair lap plates, it is proposed to use relations that consider the unsymmetry of the structure. An analytical solution of the geometrically nonlinear problem is presented for smooth composite panels, whose shape is close to a square, loaded by tangential flows. The initial relations of the problem consider the possible unsymmetry of the structure and include mixed stiffnesses. The boundary conditions in this case correspond to a hinged support. An explicit expression is obtained for the critical stresses of the loss of stability under the action of tangential forces. Relations for the stress-strain state of a square composite panel at its geometrically nonlinear behavior are given. Examples of determination of the critical shear forces are presented, and the expediency of consideration of unsymmetry of the structure in verification calculations of thin composite panels is shown.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 57, No. 3, pp. 429-440, May-June, 2021.
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Mitrofanov, O. Evaluation of the Buckling Stability and Geometrically Nonlinear Behavior of Square Composite Panels of an Unsymmetrical Structure in Shear. Mech Compos Mater 57, 301–308 (2021). https://doi.org/10.1007/s11029-021-09955-0
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DOI: https://doi.org/10.1007/s11029-021-09955-0