A level-set-based strategy for thickness optimization of blended composite structures

Nasab, F. Farzan; Geijselaers, H.J.M.; Baran, İsmet; Akkerman, Remko; Boer, Andries de

doi:10.1016/j.compstruct.2018.08.059

Cited by 16 publications

(9 citation statements)

References 51 publications

(122 reference statements)

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“…Nasab et al (2018) [74] used a gradient-based approach to the thickness optimization of stiffened composite skins, guaranteeing the blending of plies over individual panels. The approach considered design guidelines such as symmetry, covering ply, disorientation, percentage rule, balance, and contiguity of the layup.…”

Section: Gradient-based Methodsmentioning

confidence: 99%

“…The publications reviewed that used heuristic methods were more likely to optimize the ply-orientation considering a discrete set of values [12,57,73,96,112,208]. On the other hand, researches using gradient-based or hybrid methods preferred continuous variables [67, 74,171,220], or the optimization of the lamination parameters followed by a second optimization or selection criteria to choose the stacking sequence with the most similar characteristics [60,218]. This review does not have the extension of the work presented by Xu et al [275] and Nikbakht et al [174,175], limiting the validity of a statistical analysis on the popularity of the different methods used in the literature.…”

Section: Hybrid and Other Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Design and optimization of self-deployable damage tolerant composite structures: A review

Fernandes

Pinto

Correia

2021

Composites Part B: Engineering

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Section: Gradient-based Methodsmentioning

confidence: 99%

Section: Hybrid and Other Methodsmentioning

confidence: 99%

Design and optimization of self-deployable damage tolerant composite structures: A review

Fernandes

Pinto

Correia

2021

Composites Part B: Engineering

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“…The majority of the research in the field of optimization of composite structures is fully or partially dependent on evolutionary algorithms, in particular a genetic algorithm (GA) [17]. The reason is that a GA is a search technique well suited for optimization problems, in which discrete design variables are involved [18,19] and the gradient of the objective or constraint function cannot be calculated.…”

Section: B Motivation and Aim Of The Present Researchmentioning

confidence: 99%

“…Gradient-based algorithms are required to have an efficient and fast optimization of complex structures. A fully gradient-based method has been proposed by the authors [17]. This method aims at optimizing the stacking sequences and thickness distribution of large-scale composite structures considering the design rules and manufacturing guidelines.…”

Section: B Motivation and Aim Of The Present Researchmentioning

confidence: 99%

Optimization of the Interacting Stiffened Skins and Ribs Made of Composite Materials

et al. 2020

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A decomposition strategy for the structural optimization of a fiber-reinforced aircraft wing box is proposed. The proposed method decomposes the wing-box optimization into two levels: a system-level and a subsystem-level optimization. The ribs are the subsystems of the problem. Each rib has a local set of design variables and constraints. The loads on the ribs are the crushing loads caused by the bending of the wing. At the system level, the wing-box skins are optimized while accounting for the effect of the skin design on the loads applied to the ribs. The sensitivity of the rib mass to the applied loads is evaluated using the Lagrange multipliers of the optimized rib design. To enhance the numerical efficiency of the two-level optimization, the changes of the loads on the ribs are subjected to a reduction by principal component analysis (PCA). In both the wing-level and rib-level optimization problems, the level-set strategy for the optimization of composite structures, previously introduced by the authors, is employed. This method permits an advantageous use of coarse and fine finite element models employing a standard commercial finite element code. The proposed method is applied to the design of a composite horizontal tail plane. The accuracy of and the computational time savings by the proposed PCA-based reduction scheme are quantified.

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“…The components of CT and diagnostic X-ray equipment requiring X-ray transmission performance are produced using carbon material. Carbon fiber reinforced plastics (CFRP) components and plates were designed by several optimization processes for the shape and thickness [16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Sandwich Composite Cradle for Computed Tomography Instrument by Analyzing the Structural Performance and X-ray Transmission Rate

Iis

2019

Materials

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Carbon fiber-reinforced composite has an excellent X-ray transmission rate as well as specific modulus and strength. The major components of medical devices, X-ray systems, and computed tomography (CT) equipment that require superior X-ray transmission performance also require structural performance for deformation. Therefore, medical components consist of a sandwich composite structure with carbon fiber composites applied as a face material. The X-ray transmission ratios of face material and foam material were measured according to thickness, and the relation equation for thickness and X-ray transmission rate was derived. The X-ray transmission rate for the sandwich composite structure consisting of face and core material was measured and the relationship between the X-ray transmission rate and the dimension for thickness of sandwich cradle was derived. Using the optimization process, the thicknesses of face and core materials for sandwich cradles were determined to minimize the cost of used materials. They also met the criteria that the deflection should not be more than 20 mm, and the X-ray transmission rate of the cradle should be equal to or greater than that of aluminum at 1.5 mm thickness. The sequence pattern of face material was proposed through structural analysis. The face material of the sandwich cradle was manufactured by a resin infusion and vacuum bagging method, followed by inserting the core between the cured faces. Next, the sandwich cradle assembly was completed and re-cured. The sandwich cradle met the criteria that the deflection at the end was 19.04 mm and the X-ray transmission was 78.7% greater than the X-ray transmission of 1.5 mm aluminum.

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A level-set-based strategy for thickness optimization of blended composite structures

Cited by 16 publications

References 51 publications

Design and optimization of self-deployable damage tolerant composite structures: A review

Design and optimization of self-deployable damage tolerant composite structures: A review

Optimization of the Interacting Stiffened Skins and Ribs Made of Composite Materials

Optimal Design of Sandwich Composite Cradle for Computed Tomography Instrument by Analyzing the Structural Performance and X-ray Transmission Rate

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