Open-Hole Tensile Experiments of Thermoplastic Composite Laminates and Finite Element Analysis

Özer, Hakkı; Kurtuluş, Orhan; Güçlü, Harun; Taş, Mustafa; Yazıcı, Murat

doi:10.22399/ijcesen.323872

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…This is mainly caused by the initiation of fibre tensile damage around the notch along with serious matrix tensile failure in all plies. Many authors such as Prabhu et al., 21 Özer et al., 22 Farande and Kulkarni, 23 and Aradhye and Kulkarni 24 in their recent works also had resorted to experimental techniques for investigation of the strength of laminated composites with holes and evaluation of nearby stress field of hole-edges. The specimens and the test methods followed did not however adhere to the ASTM standards.…”

Section: Experimental Investigationsmentioning

confidence: 99%

A review of stress concentration studies on fibre composite panels with holes/cutouts

Kumar¹,

Rajesh²,

Pugazhendhi

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Composite panels are widely used as structural members due to their high strength-to-weight ratio. In order to reduce further weight, cutouts or notches are introduced in these members. These cutouts also serve utility requirements such as man-holes for purpose of service as well as for passing electric or fuel lines. An aircraft wing rib is a typical example of such a composite panel. Even while composites with holes or cutouts provide great savings in weight compared to metallic structures, the presence of holes itself leads to strength reduction. The reduction in strength is due to the concentration of stress around the vicinity of the hole while the structure is under loading. Different-sized and shaped holes/cut-outs are used in composites structural members, which may serve for different purposes. They, in turn, introduce their own versions of stress concentrations effects in such members leading to weakening of the structure. The stress concentration effect in fibre composites also depends on other factors like fibre orientation, fibre material, matrix material, etc. Loading can also influence stress concentration. This review pursues vast research done in this area and attempts to compare and summarise the diverse findings for designers to obtain a comprehensive concept on stress concentration factor as an effective tool for composite structure design.

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Section: Experimental Investigationsmentioning

confidence: 99%

A review of stress concentration studies on fibre composite panels with holes/cutouts

Kumar¹,

Rajesh²,

Pugazhendhi

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

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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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Open-Hole Tensile Experiments of Thermoplastic Composite Laminates and Finite Element Analysis

Cited by 2 publications

References 9 publications

A review of stress concentration studies on fibre composite panels with holes/cutouts

A review of stress concentration studies on fibre composite panels with holes/cutouts

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

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