Tow placement studies for liquid composite moulding

Rudd, Chris; Turner, M. R.; Long, A.C.; Middleton, V.

doi:10.1016/s1359-835x(99)00010-x

Cited by 35 publications

(24 citation statements)

References 21 publications

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“…With increased preform thickness, the influence of through-thickness permeability on LCM processing of composites becomes increasingly significant [15][16][17]. When resin injection is facilitated in transverse direction, by using a distribution medium, such as in the Vacuum Assisted Resin Transfer Molding (VARTM), K 33 becomes the dominant parameter.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Aziz

Ali

Zeng

et al. 2017

Composites Science and Technology

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This work presents a correlation between the transverse permeability of a preform and the process variability of the automated dry fiber placement manufacturing technique. In this study, an experimental and numerical analysis of the dry tape preform, with a focus on its through-thickness permeability, has been undertaken. Geometric models, containing flow channels of two different width dry tape carbon preforms, have been created in the TexGen modeller. A Computational fluid dynamics (CFD) simulation has been undertaken to obtain the predicted through-thickness-permeability of the dry tape preform. A parametric study on the effect of different dry tape gap sizes on the permeability of the preform is presented. An in-situ compaction study, carried out in an X-CT machine, revealed that the gap sizes were irregular throughout the manufactured preforms. In addition, an experimental investigation of the through-thickness permeability, which is based on a saturated flow condition at a thickness corresponding to full vacuum pressure, is also presented. The permeability prediction based on the X-CT re-constructed geometric model has been validated using the experimental data. A further parametric study has revealed that the process variablity in automated dry fibre placement influences the through-thickness permeability by a factor of upto 5.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Aziz

Ali

Zeng

et al. 2017

Composites Science and Technology

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show abstract

“…It is a classic case of a double curved geometry [24,[35][36][37] that presents the advantage to have regular change of curvatures while producing strong distortions for a sufficiently deep forming [38]. This forming process has been simulated using the two approaches (tension only, tension + shear).…”

Section: Hemispherical Forming Of An Unbalanced Fabricmentioning

confidence: 99%

A woven reinforcement forming simulation method. Influence of the shear stiffness

Zouari

Daniel

Boisse

2006

Computers & Structures

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A simulation method is proposed for forming processes of fabrics used as reinforcements of composite materials. It uses specific finite elements made of woven material. The nodal interior loads are deduced from yarn tensile strain energy and woven cell shear energy. A picture frame shear test is presented. Optical measures permit to analyse the strains in yarns at microlevel for the different stages of the shear test. The influence of shearing in the formulation is studied on two forming simulations. It is shown that taking shear into account permits the appearance and the development of wrinkles when the locking angle is overcome.

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“…the 'draping' problem in the manufacture of advanced composite components of complex geometry (Hancock & Potter 2006). Extension of the present considerations, together with modern tow placement machines (Rudd et al 1999) could help in the development of improved manufacturing techniques. The present findings already provide a pattern-book for future artistic and practical endeavours.…”

Section: Resultsmentioning

confidence: 84%

Wrapping the cube and other polyhedra

et al. 2012

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An infinite series of twofold, two-way weavings of the cube, corresponding to 'wrappings', or double covers of the cube, is described with the aid of the two-parameter GoldbergCoxeter construction. The strands of all such wrappings correspond to the central circuits (CCs) of octahedrites (four-regular polyhedral graphs with square and triangular faces), which for the cube necessarily have octahedral symmetry. Removing the symmetry constraint leads to wrappings of other eight-vertex convex polyhedra. Moreover, wrappings of convex polyhedra with fewer vertices can be generated by generalizing from octahedrites to i-hedrites, which additionally include digonal faces. When the strands of a wrapping correspond to the CCs of a four-regular graph that includes faces of size greater than 4, non-convex 'crinkled' wrappings are generated. The various generalizations have implications for activities as diverse as the construction of woven-closed baskets and the manufacture of advanced composite components of complex geometry.

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Tow placement studies for liquid composite moulding

Cited by 35 publications

References 21 publications

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

Transverse permeability of dry fiber preforms manufactured by automated fiber placement

A woven reinforcement forming simulation method. Influence of the shear stiffness

Wrapping the cube and other polyhedra

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