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Design of thin orthotropic panels according to the postbuckling state under combined loading taking into account uniform heating


The design problem of thin composite panels with possible postbuckling and uniform heating is examined. The panels have an orthotropic structure and boundary conditions correspond to hinge support. It is assumed that panels are loaded with biaxial compression and shear. Based on load-bearing panels design by postbuckling state panels, a minimal thickness definition method using geometrically nonlinear correlations is suggested in this paper. To explain this method, examples of composite panels design with uniaxial compression are provided in this paper. It is shown that for load-bearing panels optimal thickness definition based on stability conditions correlations are generally quadratic equations but for design based on postbuckling state defining expressions are cubic equations. Tsai criterion for monolayer is used in this work for multilayer package critical state definition in terms of strength conditions for combined loading case. Examples of orthotropic panels design methods based on postbuckling state with longitudinal compression and shear considering uniform heating are shown. Maximum-stress theory is used in panels design by static strength support conditions. For the option of creating panels taking into account the resource requirements, it is proposed to use the Tsai criterion taking into account the normal transverse and tangential stresses of the monolayer.

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Correspondence to Mazen Osman.

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Mitrofanov, O.V., Osman, M. Design of thin orthotropic panels according to the postbuckling state under combined loading taking into account uniform heating. AS 5, 29–36 (2022).

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  • Load-bearing panels
  • Geometric nonlinearity
  • Orthotropic materials
  • Uniform heating
  • Compression and shear