Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 4 1 2014 03 21 Optimization of shells with laminated stiffeners for minimum weight and maximum buckling load Optimization of shells with laminated stiffeners for minimum weight and maximum buckling load 37 49 247 10.22044/jsfm.2014.247 FA Morteza Bagheri Journal Article 2012 09 15 In this research, the optimization of laminated cylindrical shells with composite ring stiffeners is implemented by the Genetic Algorithm (GA). The objectives seek the maximum general buckling pressure and minimum weight of laminated stiffened shells. The buckling pressure is evaluated using Love’s First-order Shear Deformation Theory (FSDT) and solved using the Rayleigh-Ritz energy method. The research introduces a strain energy formulation for laminated ring stiffeners, in which each ring stiffener may be treated individually and the geometrical dimensions and material properties of the stiffeners may be different from one another. Furthermore, the formulation enables the analyst to optimize the material properties of the stiffeners different from those of the parent shell. The results show that the effect of the material and geometrical properties of the shell and stiffeners on the stiffened shell’s buckling capacity is larger than its weight. Also, the buckling optimization has much greater efficiency than the buckling-weight and weight optimizations. In this research, the optimization of laminated cylindrical shells with composite ring stiffeners is implemented by the Genetic Algorithm (GA). The objectives seek the maximum general buckling pressure and minimum weight of laminated stiffened shells. The buckling pressure is evaluated using Love’s First-order Shear Deformation Theory (FSDT) and solved using the Rayleigh-Ritz energy method. The research introduces a strain energy formulation for laminated ring stiffeners, in which each ring stiffener may be treated individually and the geometrical dimensions and material properties of the stiffeners may be different from one another. Furthermore, the formulation enables the analyst to optimize the material properties of the stiffeners different from those of the parent shell. The results show that the effect of the material and geometrical properties of the shell and stiffeners on the stiffened shell’s buckling capacity is larger than its weight. Also, the buckling optimization has much greater efficiency than the buckling-weight and weight optimizations. https://jsfm.shahroodut.ac.ir/article_247_0c45931461c8b2f14a5259d6c508ad28.pdf