Abstract
In this manuscript, stiffened carbon / epoxy composite cylinders under external hydrostatic pressure will be examined to minimize mass and maximize buckling pressure. The new approach proposed in this paper is single objective optimization of stiffened composite cylindrical shell under external pressure by genetic algorithm (GA) in order to obtain the reduction of mass and cost, and increasing the buckling pressure. The objective function of buckling has been used by performing the analytical energy equations and Tsai-Wu and Hashin failure criteria have been considered. Single objective optimization was performed by improving the evolutionary GA. Optimization have been done to achieve the minimum weight with failure and buckling constraints. Finally, optimal angles pattern of layers and fiber orientations are provided for cylinder under external hydrostatic pressure.
Highlights
Buckling of laminated cylindrical shells has been considered in the field of mechanical engineer‐ ing, marine science, civil, chemical and aerospace engineering
The significant increase in carbon fiber composites in various industries, show the importance of the mechanical properties of these materials. This in‐ creased use of carbon fiber composites is due to its high strength to weight, stiffness to weight ratio, and appropri‐ ate properties in their fatigue loads
Optimization have been done to achieve the minimum weight with failure and buckling constraints
Summary
Buckling of laminated cylindrical shells has been considered in the field of mechanical engineer‐ ing, marine science, civil, chemical and aerospace engineering. The optimization of laminated composite cylindrical shell under different load and pressure has already been highly regarded in literature Haftka and Riche, 1993; Onoda, 1985; Abdi et al, 2012; Koide and Luersen, 2013; Almeida and Awrucha, 2007; Topal, 2011; Raju and Rao, 2015 In these researches, mass and cost of shell, strength and stiffness, frequency and stability can be function for optimizing. Ghasemi and Hajmohammad 2017 investigated multi‐objective optimization of composite cylindrical shell under external hydrostatic pressure They considered parameters of mass, cost and buckling pressure as fitness functions and failure criteria as optimization criterion. This stiffener is the most used type of stiffeners in composite cylinders
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