Optimization of course locations in fiber-placed panels for general fiber angle distributions

Blom, Adriana W.; Abdalla, Mostafa; Gürdal, Zafer

doi:10.1016/j.compscitech.2009.12.003

Cited by 91 publications

(52 citation statements)

References 20 publications

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“…29,30 Since the fibre angle distribution is defined over the complete structure, the fibre paths will also be found for the complete structure, and trimmed afterwards depending on the boundaries found in the previous step. …”

Section: Post-processingmentioning

confidence: 99%

Design Guidelines in Nonconventional Composite Laminate Optimization

Peeters

Abdalla

2017

Journal of Aircraft

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A method for optimising ply drop locations in composite laminates is developed using ideas from topology optimisation. The design is parametrised using a fibre angle and fictitious density distribution for each ply. The solution proceeds using a successive conservative convex approximations strategy. The structural responses are approximated separately in terms of the angle and fictitious density distributions of each ply. Explicit penalisation of intermediate densities is used to force the densities to either one, ply coverage, or zero, no coverage. Ply drop locations are identified as the boundary between regions having densities near one and those near zero. The ply drop optimisation is combined with fibre angle optimisation by alternating the optimisation between the corresponding set of variables. Optimised variable stiffness, variable thickness composite laminates are obtained. Initial results show that large improvements in buckling load of flat plates can be obtained by combining ply drop and fibre angle optimisation.

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Section: Post-processingmentioning

confidence: 99%

Design Guidelines in Nonconventional Composite Laminate Optimization

Peeters

Abdalla

2017

Journal of Aircraft

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“…imperfections) between the numerical model of the VAT composite and the real structure tailored with the AFP process, if the design methodology does not take into account the manufacturability requirements. To this purpose in [3] an issue linked to the AFP technology is addressed: the overlap of tow-placed courses that increases the ply thickness (the build-up phenomenon) thus aecting the structural response and surface quality of the laminate. The work of Blom et al [3] presents a method for designing composite plies with varying bre angles.…”

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A New Paradigm for the Optimum Design of Variable Angle Tow Laminates

Montemurro

Catapano

2016

Variational Analysis and Aerospace Engineering

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“…19 The effect of this conversion method on the thickness build-up due to fiber steering is discussed in this paper. The streamline analogy presented by Blom et al 21 will be used to obtain an estimate of the smeared thickness and to determine fiber paths for each layer in the laminate, and it will be shown how this estimate can be used as a constraint in the conversion process. The effect of in-plane fiber curvature on thickness build-up will be demonstrated using a square plate under a biaxial compressive load for which the optimum LP distribution is assumed to be known.…”

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confidence: 99%

“…The streamline analogy can be used to estimate the smeared thickness of in-plane fiber angle distribution 21 per ply:…”

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confidence: 99%

Design of Fiber-steered Variable-stiffness Laminates Based on a Given Lamination Parameters Distribution

Campen

Kassapoglou²,

Gürdal³

2011

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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Mechanical properties of fiber-reinforced laminated composite materials are directionally dependent. Contemporary laminated composite design aims to make effective use of these directional properties by means of stacking sequence design, selecting the fiber orientation angle of each ply from a predefined set. Automated fiber-placement (AFP) technology can be used to improve the efficacy of composite materials by means of fiber steering. The variation of fiber orientation angles per ply of the laminate yields a variable stiffness (VS) laminate. For optimization purposes it is attractive to design such laminates in terms of lamination parameters (LP), as the number of design variables per point in the structure can be reduced to as little as four dimensionless variables considering balanced symmetric layups, and because many lay-up optimization problems can be made convex by describing them in terms of LPs. VS laminate design in terms of LP requires the obtained LP distribution to be converted into an actual fiber angle design. In a previous study the authors proposed a method to convert VS laminate designs using LPs into fiber angle designs. This method includes a constraint on in-plane curvature, a manufacturing constraint related to AFP. Thickness build-up will occur due to fiber steering. The amount of thickness build-up that results from the obtained fiber angle designs is discussed here as a function of the constraint on fiber curvature. The streamline analogy is used to obtain an estimate for thickness build-up and to determine fiber paths. A square plate loaded in biaxial compression is used to demonstrate the effect of the in-plane curvature constraint on thickness build-up, and several fiber angle designs, thickness distributions and fiber paths are given for this structure.

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Optimization of course locations in fiber-placed panels for general fiber angle distributions

Cited by 91 publications

References 20 publications

Design Guidelines in Nonconventional Composite Laminate Optimization

Design Guidelines in Nonconventional Composite Laminate Optimization

A New Paradigm for the Optimum Design of Variable Angle Tow Laminates

Design of Fiber-steered Variable-stiffness Laminates Based on a Given Lamination Parameters Distribution

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