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From: School of Engineering and Information Technology, University of New South Wales, Canberra, Australia
Finite Element Modelling and Buckling Analysis of Anisogrid Composite Lattice Cylindrical Shells, by Evgeny Morozov, Alexander Lopatin, Vladimir Nesterov
The buckling behaviour of anisogrid composite lattice cylindrical shells subjected to axial compression, transverse bending, pure bending, and twisting has been investigated. The lattice shells are modelled as three-dimensional frame structures composed of the curvilinear ribs capable of withstanding the tension/ compression, bending in two planes and twisting. Geometric and finite element models of the lattice shells are generated using the rotation, copying, and translation of the universal typical unit cell.
The dedicated procedure (finite element model generator) is developed to control the orientation of the beam element allowing the original twisted geometry of the curvilinear ribs to be closely approximated. The effects of varying the length of the shells, the number of helical ribs and the angles of their orientation on the buckling behaviour of lattice structures are examined using parametric analyses. The influence of reinforcements around the cutout edges (Fig. 4) for the lattice shells having the holes is also investigated. The results show that these parameters strongly affect the values of critical loads and buckling mode shapes of the CFRP lattice shells subjected to various loadings. It is shown that the discrete modelling approach presented in the paper provides a sufficiently accurate buckling analysis of the lattice shells and, at the same time, can be efficiently employed in solving the relevant design and design optimisation problems.
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