Multi-Objective Optimization of Strength and Thickness for Delaminated Composite Shells Undergoing Large-Amplitude Oscillations Using NSGA-II
Subject Areas : Solid MechanicsMohammad Abbaszadeh 1 , abbas kamaloo 2 *
1 - 3 km, Daneshgah Boulevard, Minab, Hormozgan, Iran, Minab National Skilling University
2 -
Keywords: NSGA II, throughout circumference delamination, delaminated conical composite shells, delaminated cylindrical composite shells, nonlinear vibration, stacking sequence optimization,
Abstract :
This study presents the multi-objective optimization of delaminated multi-ply cylindrical and conical shells to simultaneously maximize strength and minimize thickness using one of the famous Evolutionary multi-objective optimizations, the Non-dominated Sorting Genetic Algorithm II (NSGA-II). The shells, Cylindrical and conical shells with throughout-circumference delamination are subjected to large-amplitude oscillations. The optimization aims to identify optimal strength-to-thickness ratios by treating fiber orientation angles, individual layer thicknesses, and layup configurations (cross-ply, angle-ply, and off-axis) as design variables. Results indicate that cross-ply layups achieve the highest performance in terms of strength-to-thickness ratio under nonlinear vibrations, followed by angle-ply and off-axis configurations, respectively. Furthermore, increasing the initial population size improves the optimization results for both shell types. However, while a higher number of iterations enhances outcomes for cylindrical shells, it adversely affects the optimization performance for conical shells.
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