Multi-objective design optimization of variable stiffness composite cylinders

Rouhi, Mohammad; Ghayoor, Hossein; Hoa, Suong V.; Hojjati, Mehdi

doi:10.1016/j.compositesb.2014.10.011

Cited by 84 publications

(20 citation statements)

References 18 publications

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“…The resulting curve, or hyper-surface in case of higher dimensions, is a low cost approximation for the costly high fidelity model that is used for function calls in MBDO process. Among several metamodeling techniques developed for engineering design optimization purposes [21,22], the radial basis functions (RBF) offer accurate and reliable predictions at a relatively low computational cost for buckling response of VS composite structures [7,8]. Therefore, RBF-based metamodels were used in this study to construct surrogate models relating the buckling load (F cr ) to the design variables (T i 's).…”

Section: Design Optimizationmentioning

confidence: 99%

“…The resulting so-called variable stiffness (VS) composite laminate offers the designers more scope to use the directional properties of the material more efficiently to produce VS composite cylinders [5,6,7,8,9] with better structural performance compared with their traditional Constant Stiffness (CS) counterparts. However, this improvement is at the expense of adding more complexity to the design optimization process because of the increased number of design variables.…”

Section: Introductionmentioning

confidence: 99%

“…in bending. Therefore, extensive research works have been performed subsequently to improve the bending-induced buckling capacity of circular VS composite cylinders [5,7,8,9]. The inhomogeneity of the section load in the skin arising from overall bending gives designers suitable scope to vary the orientation angle of fibers from the compressive side to the tension side so that the section loads are redistributed more efficiently.…”

Section: Introductionmentioning

confidence: 99%

“…Afterwards, for VS design, the optimum fiber orientation angle distribution in the circumferential direction is calculated. For both cases, a multi-step surrogate based design optimization method [7,8,9] is used. Finally, the potential improvement of the buckling capacity for the VS design compared with its counterparts with constant stiffness (CS) and quasi-isotropic (QI) laminates is studied for different crosssectional aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness tailoring of elliptical composite cylinders for axial buckling performance

Rouhi

Ghayoor

Hoa

et al. 2016

Composite Structures

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAutomated fiber placement (AFP) machines have made it possible to tailor the material stiffness properties in a laminated composite structure by fiber steering. The so-called variable stiffness (VS) laminate can be designed to improve the structural performance of a composite component. Herein, using a metamodeling based design optimization (MBDO) method, elliptical composite cylinders with VS laminate are designed and optimized for maximum axial buckling capacity. The effect of cross-sectional aspect ratio of the elliptical cylinders on the potential improvement of the buckling capacity is also investigated. As the baseline for comparison, for each cross-sectional aspect ratio, the buckling capacity of elliptical cylinders with quasi-isotropic (QI) and optimum constant stiffness (CS) laminates are also calculated. It is found that the buckling capacity of an elliptical composite cylinder can be improved by fiber steering up to 118% compared with its best CS counterpart.

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Section: Design Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stiffness tailoring of elliptical composite cylinders for axial buckling performance

Rouhi

Ghayoor

Hoa

et al. 2016

Composite Structures

Self Cite

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“…Several examples of research works on the design and optimization of composite materials have demonstrated the potential of the variable-stiffness design to improve the in-plane stiffness Nik et al, 2012), buckling resistance (Hyer and Lee, 1991;Wu et al, 2013), strength (Lopes et al, 2008;Khani et al, 2011), vibration response (Abdalla et al, 2007;Blom et al, 2008;Ribeiro and Akhavan, 2012;Ribeiro et al, 2014;Ribeiro, 2015a-b;Yazdani et Ribeiro, 2015;Venkatachari et al, 2016) and bending properties (Blom et al,2010;Rouhi et al ,2015).…”

mentioning

confidence: 99%

Campbell Diagrams of a Spinning Composite Shaft with Curvilinear Fibers

Boukhalfa

2017

Lat. Am. j. solids struct.

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This paper presents the vibratory behavior of a spinning composite shaft with curvilinear fibers on rigid bearings in the case of free vibrations. A p-version of finite element is used to define the model. A theoretical study allows the establishment of the kinetic energy and the strain energy of the shaft, necessary to the result of the equations of motion. In this model the transverse shear deformation, rotary inertia and gyroscopic effects have been incorporated. A hierarchical beam finite element with six degrees of freedom per node is developed and employed to find the natural frequencies of a spinning composite shaft with variable stiffness (curvilinear fibers). A computer code is elaborate for calculating the natural-frequencies for various rotating speeds of the composite shafts with curvilinear fibers. In the absence of publications of vibration analysis of rotating composite shafts with curvilinear fibers, the formulation is verified by comparisons with published data on rotating composite shafts reinforced by straight fibers. The influence of the physical, geometrical parameters, the boundary conditions and the curvilinear fiber paths on the first natural frequencies of the spinning composite shafts is studied by plotting various Campbell diagrams.

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Multi‐objective stiffness and mass optimization of bio‐inspired hierarchical grid‐honeycomb sandwich structures with cutouts considering buckling constraints

Lv,

Shi,

Chen

et al. 2024

Polymer Composites

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The engineering structures with cutouts should consider both buckling and stiffness. Inspired by the multi‐level leaf veins, in this paper, the skeleton of the grid‐honeycomb sandwich structure was designed in the hierarchical form, and combined with the cutout characteristics of the side walls of the railway vehicle body, the multi‐objective stiffness and mass optimization of the skeleton layout under buckling constraints was achieved. The cutout honeycomb sandwich structure was designed with orthogonal grids in the stiffness design area and curved grids based on the quadratic polynomial in the buckling design area. The optimization model also included the linear angle hierarchical grid, the constant angle hierarchical grid, and the single‐level orthogonal grid. The multi‐objective optimization framework based on the Radial Basis Function (RBF) surrogate model and the Non‐dominated Sorting Genetic Algorithm (NSGA‐II) was developed. The optimization results indicated that the hierarchical grid provided the more extensive design space. The optimal solution of the quadratic polynomial hierarchical grid had the highest stiffness and stiffness per unit mass compared to the rest of the grid layouts, which were 23.28% and 30.47% higher than the single‐level orthogonal grid, respectively. Finally, the multi‐order eigenvalue buckling was analyzed based on the optimal structure.Highlights Layout of hierarchical grids proposed inspired by multi‐level leaf veins. Orthogonal grids ensure stiffness and curved grids inhibit buckling at cutouts. Apply the hierarchical grids as skeletons to honeycomb sandwich structures. Stiffness and mass optimization subject to buckling constraints is performed.

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Multi-objective design optimization of variable stiffness composite cylinders

Cited by 84 publications

References 18 publications

Stiffness tailoring of elliptical composite cylinders for axial buckling performance

Stiffness tailoring of elliptical composite cylinders for axial buckling performance

Campbell Diagrams of a Spinning Composite Shaft with Curvilinear Fibers

Multi‐objective stiffness and mass optimization of bio‐inspired hierarchical grid‐honeycomb sandwich structures with cutouts considering buckling constraints

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