Abstract
This paper presents a discrete model for the buckling sensitivity analysis of thin multi-layered angle-ply composite structures. The model is based on a simple and efficient plate-shell element with 18 d.f. using the discrete Kirchhoff theory for the bending effects. Angle-ply design variables and vectorial distances from the middle surface to the upper surface of each layer, indirectly the thickness of each layer, are considered as design variables. The objective of the design is the maximization of the constrained or unconstrained buckling load parameter. The optimization process can be carried out using a two-level approach. The design sensitivities are evaluated analytically, quasi-analytically and by global finite difference. The efficiency and accuracy of the model developed is discussed with reference to several applications.
Published Version
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