Prediction of Tow Architecture and Stress Distributions for a 3D Woven Composite

Ballard, M. Keith; Whitcomb, John D.

doi:10.12783/asc2017/15402

Cited by 1 publication

(8 citation statements)

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“…In an earlier work, an analysis of a plain orthogonal weave that was thinner and had much larger binders than the weave considered herein predicted similarly that σyy' concentrations develop in a weft when a binder comes close as the binder traverses the thickness of the textile. 25,26 However, the analysis of the plain orthogonal weave predicted that σyy' concentrations also formed in wefts just before and after a binder crossed over, near the z-crowns. This study of a twill orthogonal weave did not predict stress concentrations in similar locations.…”

Section: Resultsmentioning

confidence: 99%

“…This suggests that the locations of important stress concentrations can have a strong dependence on parameters of the tow architecture and insights attained for a twill orthogonally woven textile may not be valid for other types of 3D textiles, even other types of orthogonally woven textiles such as plain orthogonally woven. 25,26…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This paper considers a simple, non-idealized twill orthogonally woven textile composite, consisting of five layers of wefts, four layers of warps, and about 3.5% volume fraction (VF) of binders, which is closer to typical 3D textiles than the textile architecture studied by Ballard and Whitcomb 25 and Ballard et al. 26 Tension along the warp direction is considered.…”

Section: Introductionmentioning

confidence: 99%

“…The study considered a textile architecture with binders that were much larger those typically found in the literature, and the study showed that the stress concentrations may be sensitive to the imposed boundary conditions. 25,26 This paper considers a simple, non-idealized twill orthogonally woven textile composite, consisting of five layers of wefts, four layers of warps, and about 3.5% volume fraction (VF) of binders, which is closer to typical 3D textiles than the textile architecture studied by Ballard and Whitcomb 25 and Ballard et al 26 Tension along the warp direction is considered. Other types of load configurations would be of interest but are excluded due to the length of the paper.…”

Section: Introductionmentioning

confidence: 99%

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Detailed stress analysis of a twill orthogonally woven textile composite

Ballard

Whitcomb

2020

Journal of Composite Materials

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A finite element analysis framework that leverages high-performance computing was used to analyze a twill orthogonally woven textile model. Boundary conditions for uniaxial tension along the warp direction were applied to a large analysis region, and an interior subregion was used for investigating the stress distributions. The locations of severe stresses were investigated for the binders, wefts, warps, and matrix, respectively, and the connection of the stress state to the surrounding tow architecture was discussed. It was shown that the highest stresses developed in the binders where the path of a binder changed direction, due to a transfer of load to nearby wefts that induced a severe shear stress in the binder. Additionally, severe stress concentrations were observed in both the wefts and binders where the binders traversed the thickness of the textile and came near a weft. The magnitude of the concentration in the binders closely matched across similar locations. On the other hand, the concentrations in the weft appeared to be sensitive to the faceted surfaces of the tows, which sometimes resulted in sharp edges, but these stress the concentrations in the wefts did remain localized. In the warps, the normal stress in the direction of the load was the largest, but the most severe stress state was shown to occur in a very small region where warps came close to binders as the path of the binder transitioned.

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