Topology optimization-guided stiffening of composites realized through Automated Fiber Placement

Esposito, Luca; Cutolo, A.; Barile, Marco; Lecce, Leonardo; Mensitieri, Giuseppe; Sacco, Elio; Fraldi, Massimiliano

doi:10.1016/j.compositesb.2018.11.032

Cited by 41 publications

(10 citation statements)

References 34 publications

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“…The domain of the design variables is defined by the design constrains (1) 3 , while additional constraint equations can be stated as in (1) 2 in terms of the state functions s j t ð Þ, which depend on the design variables. In the work by Esposito et al [20], an analytical solution is provided for an orthotropic layer where the optimal orientation of the fibers has been determined by minimizing the mean compliance of the structure under either prescribed tractions or imposed displacements. By considering the total potential energy U, the weak formulation of the linear elastostatic problem for a plane structure under the action of both body forces f x ð Þ; x 2 X, surface tractions t x ð Þ; x 2 oX t and prescribed displacements u 0 x ð Þ; x 2 oX u , requires that…”

Section: Optimal Orientation In Fr Composites: Remarks On Problem Formentioning

confidence: 99%

“…The above discussed pioneering contributions have been recently extended to a wide range of design problems, including heat transfer [11,49], acoustics [18], fluid flow [9], electromagnetics [13,16], biomechanics [22,28] and many other multi-physics applications [20,30,38,50].…”

Section: Introductionmentioning

confidence: 99%

“…By invoking the theory of homogenization for anisotropic materials, Esposito et al [20] adapt the topology optimization to fiber-reinforced composites, by prescribing the materials of both matrix and reinforcement and also constraining within technological (process-induced) ranges the volume fraction of fibers, in this manner searching elastic solutions at minimal energy over all the possible families of curves that the continuous fibers can draw in any composite layer. Furthermore, Minutolo et al [36] proposed to abandon the classical design and topology optimization approaches by introducing a ''third way'' for mechanically optimizing materials and structures, baptized as Galilei's Optimization.…”

Section: Introductionmentioning

confidence: 99%

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Stacking sequences in composite laminates through design optimization

et al. 2020

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Composites are experiencing a new era. The spatial resolution at which is to date possible to build up complex architectured microstructures through additive manufacturing-based and sintering of powder metals 3D printing techniques, as well as the recent improvements in both filament winding and automated fiber deposition processes, are opening new unforeseeable scenarios for applying optimization strategies to the design of high-performance structures and metamaterials that could previously be only theoretically conceived. Motivated by these new possibilities, the present work, by combining computational methods, analytical approaches and experimental analysis, shows how finite element Design Optimization algorithms can be ad hoc rewritten by identifying as design variables the orientation of the reinforcing fibers in each ply of a layered structure for redesigning fiber-reinforced composites exhibiting at the same time high stiffness and toughening, two features generally in competition each other. To highlight the flexibility and the effectiveness of the proposed strategy, after a brief recalling of the essential theoretical remarks and the implemented procedure, selected example applications are finally illustrated on laminated plates under different boundary conditions, cylindrical layered shells with varying curvature subjected to point loads and composite tubes made of carbon fiber-reinforced polymers, recently employed as structural components in advanced aerospace engineering applications.

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Section: Optimal Orientation In Fr Composites: Remarks On Problem Formentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stacking sequences in composite laminates through design optimization

et al. 2020

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“…The interface, the joints, or the surfaces, have great importance in graded material because the stress is usually limited to these locations. In these cases, the specific zone is the so-called "graded zone" and, if the volume fractions of the constituent materials change, by a certain smooth function, the material is defined as a Functionally Graded Material, FGM [19,20,21]. Furthermore, several benchmarks and reports calving models using Linear Elastic Fracture Mechanics (LEFM) are presented in [22].…”

Section: Introductionmentioning

confidence: 99%

Functionally Graded Plate Fracture by Field Boundary Element

Palladino¹,

Esposito²,

Ferla³

et al. 2021

Preprint

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The paper describes the Field Boundary Element Method applied to the fracture analysis of a 2D rectangular plate made of Functionally Graded Material to calculate Mode I Stress Intensity Factor. The object of the Field Boundary Element Method is the transversely isotropic plane plate. Its material presents an exponential variation of the elasticity tensor depending on a scalar function of position, i.e., the elastic tensor results from multiplying a scalar function by a constant taken as a reference. Several examples using a parametric representation of the structural response show the suitability of the method that constitutes a sight of Stress Intensity Factor evaluation of Functionally Graded Materials plane plates even in the case of more complex geometries.

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“…On the other hand, in the CFAO technique, each point of the material can have its specific fibre orientation and, therefore the fibre orientation can continuously vary within the domain. 27,28 The presented methodology belongs to this last family of fibre optimisation approaches.…”

Section: Introductionmentioning

confidence: 99%

Topology and fibre orientation simultaneous optimisation: A design methodology for fibre-reinforced composite components

Caivano

Tridello

Paolino

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing for fibre-reinforced composite structures is rapidly diffusing, since it enables the production of lightweight structural parts characterized by complex geometries and tailored fibre orientations. Therefore, the development of design methodologies capable to simultaneously optimize the shape of the fibre-reinforced composite part and the fibre orientation in the additive manufacturing process is, at present, of utmost interest among industries and research centres. In this paper, a novel simultaneous optimisation method capable to optimise the topology and the local fibre orientation is proposed. The method is computationally cheap, fast convergent and permits to avoid stress peaks, working efficiently on 2D and on 3D models. The analytical formulation of the problem and the optimisation algorithm are at first described. The optimisation criteria are based on the uniform strain energy density distribution and the fibre alignement along the principal stress direction. The proposed method is then verified with several benchmarks from the literature and with a 3D illustrative example, confirming that it can be effectively and efficiently employed for the optimisation of composite components to be produced through additive manufacturing.

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Topology optimization-guided stiffening of composites realized through Automated Fiber Placement

Cited by 41 publications

References 34 publications

Stacking sequences in composite laminates through design optimization

Stacking sequences in composite laminates through design optimization

Functionally Graded Plate Fracture by Field Boundary Element

Topology and fibre orientation simultaneous optimisation: A design methodology for fibre-reinforced composite components

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