Enhancement of composite open-hole tensile strength via fine Z-pins arrangements

Gao, Yu; Fei, Shaohua; Song, Xiaowen; Ding, Huiming; Wang, Han

doi:10.1016/j.ijmecsci.2022.107752

Cited by 5 publications

(1 citation statement)

References 82 publications

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“…Suresh et al 37 observed about 6%–26% reduced tensile strength for hybrid lyocell/rayon woven fabric-reinforced composites after open-hole tests due to fibre fracture and matrix cracks. Gao et al 38 tried to enhance the open-hole tensile strength of carbon fibre-reinforced composites using different diameters of Z-pins. Salleh et al 39 compared strength reduction rates of hybrid kenaf/glass with glass fibre-reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the mechanical performance of notched glass/epoxy composite laminates via hybridisation with thermoplastic fibres

Selver,

Dalfi,

Potluri

2023

Journal of Composite Materials

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This study examines empirically and theoretically the open-hole tension and compression characteristics of thermoset composites using hybrid glass/polypropylene and glass/innegra yarns. The Abaqus software, finite element analysis (FEA) has been adopted to predict the tensile and compressive failure loads and damage failure modes for un- and notched samples under tensile and compressive strength tests. The commingling technique was used to create hybrid yarns, which were then transformed into non-crimp preforms before the infusion procedure. It was noticed that the inclusion of thermoplastic polypropylene (PP) and innegra fibres increased the ductility of yarns and composites. Densities of hybrid composites were also reduced by up to 20% when compared to pure glass/epoxy composites. Tensile and open-hole tensile (OHT) test results revealed that hybrid composites are less notch sensitive than glass/epoxy composites due to enhanced composite ductility. For glass composites, having holes resulted in a 41% decrease in tensile strength, compared to reductions of only 25% and 26% for PP and innegra fibre composites, respectively. Further, compression and open-hole compression (OHC) tests presented similar results with OHT tests whilst compressive strength reduction was lower for hybrid composites (10% and 11%) compared to glass/epoxy (28%) ones. The results of the numerical simulation for damage failure modes and tensile and compressive failure loads for un-notch and notched composite laminates are consistent with the experimental findings both qualitatively and quantitatively.

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Section: Introductionmentioning

confidence: 99%

Enhancing the mechanical performance of notched glass/epoxy composite laminates via hybridisation with thermoplastic fibres

Selver,

Dalfi,

Potluri

2023

Journal of Composite Materials

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Influence of Z‐pin material on the mechanical properties of fine Z‐pin reinforced composites

Ji,

Cheng,

Wang

et al. 2024

Polymer Composites

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The insertion of finer Z‐pins is an effective method to reduce the microstructure damage and maintain the in‐plane performance of composite laminates. In this paper, an ultrasound guided insertion process is proposed to achieve the insertion of fine Z‐pins and the influence of Z‐pin material on the mechanical properties of Ø0.11 mm Z‐pin reinforced composite laminates is revealed based on experiments and simulations. For in‐plane mechanical properties, stainless steel Z‐pins help to reduce the loss of compression modulus and compression strength. For the interlaminar mechanical properties, stainless steel Z‐pins and carbon fiber Z‐pins exhibit bilinear and trilinear bridging laws respectively, resulting in the mode‐I maximum load and fracture toughness of carbon fiber Z‐pin reinforced composites being greater than that of stainless steel Z‐pin reinforced composites. By adjusting the insertion spacing, it is found that for unidirectional composite laminates reinforced by Ø0.11 mm carbon fiber Z‐pins with an insertion spacing of 2 mm, the compression strength reduction is only 3.39% while the mode‐I fracture toughness can be improved by 14.4 times in comparison with the unpinned specimens, achieving a better balance between in‐plane performance loss and interlaminar reinforcement effect.Highlights The effect of Z‐pin material on fine Z‐pin reinforced composites is studied. The compression properties are simulated by the RVE model. The mode‐I fracture properties are simulated by the DCB unit strip model.

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New metal-epoxy-matrix carbon-fibre hybrids to tackle stress concentration

Cao,

Sun,

Kawashita

et al. 2024

Composites Part A: Applied Science and Manufacturing

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Enhancement of composite open-hole tensile strength via fine Z-pins arrangements

Cited by 5 publications

References 82 publications

Enhancing the mechanical performance of notched glass/epoxy composite laminates via hybridisation with thermoplastic fibres

Enhancing the mechanical performance of notched glass/epoxy composite laminates via hybridisation with thermoplastic fibres

Influence of Z‐pin material on the mechanical properties of fine Z‐pin reinforced composites

New metal-epoxy-matrix carbon-fibre hybrids to tackle stress concentration

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