Minimum mass laminate design for uncertain in-plane loading

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Abstract

Balanced laminates, with zero in-plane to out-of-plane stiffness coupling are optimised over a range of tri-axial (Nx, Ny and Nxy) critical design loadings for minimum normalised elastic energy; equivalent to optimising for minimum mass in the absence of matrix failure. Laminates comprising standard angle plies (0, ±45 and 90) are designed for either a fixed design loading with a 10% minimum ply percentage rule (current practice) or directly for an uncertain design loading. Results show that the 10% rule performs well for the majority of design loadings. Nevertheless, for 8% of design loads considered, significantly lower mass (>10%) designs are achieved with standard angle plies when designing directly for uncertain loading. Expansion of the ply envelope to include designs with continuous angles (0° ≤ θ ≤ 180°) under an uncertain loading allows maximum mass savings up to 16% over current design practice. However, when designing directly for an uncertain loading, no significant mass reductions are achieved through the use of continuous angles.
Original languageEnglish
Number of pages12
Publication statusPublished - 19 Jul 2015

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