Avoiding interpenetrations and the importance of nesting in analytic geometry construction for Representative Unit Cells of woven composite laminates

Sevenois, Ruben; Garoz, D.; Gilabert, F.A.; Spronk, Siebe; Fonteyn, Sander; Heyndrickx, Marjolein; Pyl, Lincy; Hemelrijck, Danny Van; Degrieck, Joris; Paepegem, Wim Van

doi:10.1016/j.compscitech.2016.10.010

Cited by 49 publications

(35 citation statements)

References 33 publications

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“…Local fiber volume fractions have already been shown in fiber-reinforced composites to act as stress concentration and damage initiation regions [50,51,55,65,66]. A similar trend can also be observed in this work, by comparing the contour plots of the regions of stress concentrations in the surface weft and binder yarns illustrated in Fig.…”

Section: Role Of Local Fiber Volume Fractionsupporting

confidence: 86%

Automated generation of 3D orthogonal woven composites RVEs including yarn cross-section variations

Pierreux

Hemelrijck

Massart

2019

Composites Science and Technology

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This contribution presents an approach to generate unit-cell models of 3D orthogonal woven non-crimp fabric composites with the ability to incorporate cross-section variations in the weft and binder yarns. The approach starts from an initial loose-state configuration of the fiber-bundles, in which each fiberbundle is represented by a single discretised line. The discretised lines are shaped in a step-wise generation process by geometrical operations. During the generation procedure transformed into a boundary-or inner-line configuration, respectively, to account for their cross-section variation in subsequent steps.The fiber volume fraction and fiber direction to be used subsequently in simulations are modelled on cross-sections in a post-processing step. The shape of the surface weft yarn cross-section and binder yarn cross-sections and centerline for different binder content, diameter and tensioning can be automatically accounted for. The geometrical models are then transformed into finite element models by an automated meshing procedure to investigate how the binder yarn, and cross-section variations in the surface weft and binder yarns alter the stiffness and damage initiation levels.

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Section: Role Of Local Fiber Volume Fractionsupporting

confidence: 86%

Automated generation of 3D orthogonal woven composites RVEs including yarn cross-section variations

Pierreux

Hemelrijck

Massart

2019

Composites Science and Technology

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“…The micro-scale, where fibres, matrix and fibre-matrix interface are modelled, is used for the modelling of microcracking in Uni-Directional (UD) composite plies [1,2,3,4,5,6]. The meso-scale, where fibre bundles and matrix are distinguished, is an intermediate scale for woven [7,8,9,10] or braided [11,12,13] composites.…”

Section: Introductionmentioning

confidence: 99%

“…Popular reference works are [4,21]. Examples of where these are referenced include but are not limited to [2,7,22,23,24,25]. Another approach is to reverse engineer the constituent properties from macro-scale experimental results.…”

Section: Introductionmentioning

confidence: 99%

Multiscale approach for identification of transverse isotropic carbon fibre properties and prediction of woven elastic properties using ultrasonic identification

Sevenois

Garoz

Verboven

et al. 2018

Composites Science and Technology

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In this work the possibility to reverse engineer the transverse isotropic carbon fibre properties from the 3D homogenized elastic tensor of the UD ply for the prediction of woven ply properties is explored. Ultrasonic insonification is used to measure the propagation velocity of both the longitudinally and transversally polarized bulk waves at various symmetry planes of a unidirectional (UD) Carbon/Epoxy laminate. These velocities and the samples' dimensions and density are combined to obtain the full 3D orthotropic stiffness tensor of the ply. The properties are subsequently used to reverse engineer the stiffness tensor, assumed to be transversely isotropic, of the carbon fibres. To this end, four micro-scale homogenization methods are explored: 2 analytical models (Mori-Tanaka and Mori-Tanaka-Lielens), 1 semi-empirical (Chamis) and 1 finite-element (FE) homogenization (randomly distributed fibres in a Representative Volume Element). Next, the identified fibre properties are used to predict the elastic parameters of UD plies with multiple fibre volume fractions. These are then used to model the fibre bundles (yarns) in a meso-scale FE model of a plain woven carbon/epoxy material. Finally, the predicted elastic response of the woven carbon/epoxy is compared to the experimentally obtained elastic stiffness tensor. The predicted and measured properties are in good agreement. Some discrepancy exists between the ultrasonically measured value of the Poisson's ratio and the predicted value.Nonetheless, it is shown that virtual identification and prediction of mechanical properties for woven plies is feasible.

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“…This approach can be applied to a variety of problems, ranging from the simulation of a dry fabric to the composite mechanical response with the accurate prediction of stress-strain fields, the determination of homogenised elastic properties, and the investigation of non-linearities with plasticity, damage initiation and progression up to final failure [2]. 15 A unit cell's potential to accurately predict damage is primarily driven by a realistic representation of the underlying textile geometry. Idealised geometrical models, like for example those created by available pre-processors [3,4], provide excellent results for a variety of topologies, but modelling highly compacted triaxial braided composites with global fibre volume fractions (FVF) of 55 − 60% remains a challenging task.…”

Section: Introductionmentioning

confidence: 99%

“…Obert et al [10] introduced multiple discrete cracks in a woven unit cell and applied finite fracture mechanics to simulate the effect of transverse matrix cracks on the energy release rate. 30 Recently, increased research focus has been dedicated to the generation of more realistic geometry models, either by implementing additional processing simulation steps [11][12][13] or by a direct reconstruction of experimentally measured geometries using micro-computed tomography (µCT) images [14,15]. Green et al [13] studied the mechanical response of compacted 3D woven composites using a FE voxel discretisation and found significant differences between an idealised geometry model and one obtained from process simulation steps.…”

Section: Introductionmentioning

confidence: 99%

Predicting the non-linear mechanical response of triaxial braided composites

Wehrkamp-Richter

Carvalho

Pinho

2018

Composites Part A: Applied Science and Manufacturing

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Avoiding interpenetrations and the importance of nesting in analytic geometry construction for Representative Unit Cells of woven composite laminates

Cited by 49 publications

References 33 publications

Automated generation of 3D orthogonal woven composites RVEs including yarn cross-section variations

Automated generation of 3D orthogonal woven composites RVEs including yarn cross-section variations

Multiscale approach for identification of transverse isotropic carbon fibre properties and prediction of woven elastic properties using ultrasonic identification

Predicting the non-linear mechanical response of triaxial braided composites

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