An automated procedure for the generation and conformal discretization of 3D woven composites RVEs

Wintiba, Badadjida; Sonon, Bernard; Kamel, Karim Ehab Moustafa; Massart, Thierry

doi:10.1016/j.compstruct.2017.08.010

Cited by 63 publications

(52 citation statements)

References 30 publications

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“…At lower scales, each yarn consists of a bundle of fibers impregnated with the same resin as used for the matrix. Many studies have contributed to the modeling of woven composites microstructural geometries in order to predict their mechanical properties [1][2][3][4][5][6][7][8][9][10][11]. Most of these approaches are compared in [12] and reviewed in [13].…”

Section: Introductionmentioning

confidence: 99%

Automated reconstruction and conformal discretization of 3D woven composite CT scans with local fiber volume fraction control

Wintiba

Vasiukov

Panier

et al. 2020

Composite Structures

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An ad-hoc methodology for voxel-based geometry reconstruction is proposed. The reconstruction procedure outlined is fully automated and allows transforming explicit voxel RVE geometries into implicit smoothed geometries through a level set-based processing. During this post-processing, the yarns interpenetrations are suppressed, a thin gap is inserted between the contacting yarns and the fiber volume fraction is controlled locally by modifications of the yarns cross sections shapes. A conforming tetrahedral mesh can be subsequently generated based on the implicit geometrical description for finite elements simulations. Puck failure indices are used here to compare the damage initiation locations in the microstructure. Results show that damage initiates early and is rather randomly distributed in voxel-based discretizations, whereas it occurs more in the yarns contacting zones and in the higher fiber fraction volume regions for the smoothed RVE.

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Section: Introductionmentioning

confidence: 99%

Automated reconstruction and conformal discretization of 3D woven composite CT scans with local fiber volume fraction control

Wintiba

Vasiukov

Panier

et al. 2020

Composite Structures

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“…Resin-rich regions are represented by discretized lines, which are initially straight and are then gradually shaped using a set of geometrical operations (see Fig. 2), with concepts similar to [30,31]. The fiber-reinforced distorted zone is obtained in a post-processing step from these deformed discretized lines and is modelled in cross-sections perpendicular to the main fiber direction of the considered lamina.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of microdamage initiation in Z-pinned laminates by means of automated RVE computations

Pierreux

Hemelrijck

et al. 2018

Composite Structures

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Z-pinning was originally designed to improve the delamination toughness and the impact resistance of composite laminates. However, there is extensive experimental evidence that this improvement is accompanied by a reduction of the in-plane properties. The main mechanisms responsible for this deterioration are the local change in fiber content, fiber distortion, and the inclusion of resinrich regions near the Z-pin. The shape of these geometrical features strongly depends on the laminate stacking sequence and on pin parameters such as pin diameter, pin content, and initial pin inclination angle. Their shape complexity challenges analytical modelling approaches which are currently used to generate RVE geometries for simulations. A computational approach is presented to generate such geometrical models. Resin-rich regions are modelled by initially straight discretized lines which are gradually shaped by a set of geometrical operations mimicking pin insertion, pin rotation and fiber deflection. Fiber distortion is modelled in a post-processing stage in cross-sections accounting for the preservation of the amount of fibers. These models are then transformed into finite element mechanical models in order to investigate how local fiber volume fraction changes, fiber misalignment,

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“…A recently developed mesh generation technique for heterogeneous microstructures represented by implicit functions [35,36] is employed to mesh the generated implicitly defined RVE geometry for further 3D finite element analysis.…”

Section: D Implicit Geometry Generation For Closed Cell Metallic Foamentioning

confidence: 99%

Efficient computational modelling of closed cell metallic foams using a morphologically controlled shell geometry

Ghazi

Tiago

Sonon

et al. 2020

International Journal of Mechanical Sciences

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This contribution addresses the finite element modelling of closed cell metallic foams using Representative Volume Elements (RVEs) based on shell geometries directly extracted from implicitly defined 3D geometries. 3D RVEs of closed cell foam materials are produced by means of a generation strategy allowing a close morphological control reproducing fine scale geometrical features incorporating cell size, cell wall thickness and cell wall curvature distributions. The strategy is built on three computational ingredients: (i) a random packing algorithm based on random sequential addition assisted by neighbour distance control, (ii) a distance field-based shape tessellation (morphing) that allows incorporating cell wall curvatures and varying cell wall thicknesses and (iii) a close control on the shape of the cells. In order to decrease the computational cost of a full 3D finite element model, an original approach is proposed to produce a shell-based geometry directly from 3D information. Extracting the shell geometry from the implicitly defined 3D geometry based on the zero level of distance fields that would represent the cell walls is computationally impossible. Therefore, a novel robust procedure is proposed using careful cutting operations on distance fields for this purpose. The effect of the different microstructural geometrical features of interest on the average mechanical behaviour of the foam is investigated using shell-based finite element analyses. The computational cost and the accuracy of the proposed shell models are then assessed by comparing their results to full 3D simulations. The macroscopic behaviour of the generated shell-based model under compressive loading is then assessed up to the densification stage (including contact), and compared qualitatively with experiments from the literature. The macroscopic behaviour of the shell-based model is explained by linking it to cell/wall level deformation mechanisms.

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An automated procedure for the generation and conformal discretization of 3D woven composites RVEs

Cited by 63 publications

References 30 publications

Automated reconstruction and conformal discretization of 3D woven composite CT scans with local fiber volume fraction control

Automated reconstruction and conformal discretization of 3D woven composite CT scans with local fiber volume fraction control

Evaluation of microdamage initiation in Z-pinned laminates by means of automated RVE computations

Efficient computational modelling of closed cell metallic foams using a morphologically controlled shell geometry

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