Effects of curing pressure on mode II fracture toughness of uni-directional GFRP laminates

This work proposed a methodology to obtain the lamina and interface properties using minimal experimental works. Studies were limited to mode II delamination behavior of three quasi-isotropic quasi-homogeneous woven glass/polyester composites. It was found that the fracture toughness of 0//0, 0//45, and 45//45 laminates calculated using experimental calibration method were 0.91 N/m, 0.94 N/m, and 0.51 N/m, respectively. In addition, fiber twisting and shear cusps were observed on the delaminated surfaces of 45°-ply. Subsequently, a methodology was proposed to obtain the lamina properties for the numerical simulation without performing any additional experiment. An approach to account for the shear nonlinearity of the composite laminate due to the existence of 0°-ply was also presented. Finally, it was proposed that for reliable numerical modeling using cohesive zone model, the following parameters were recommended: penalty stiffness = 3 × 106 MPa/mm, interface shear strength = 65 MPa, mesh size = 0.5 mm, and viscosity parameter = 1 × 10−3.

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“…Nevertheless, G IIC could also be influenced by manufacturing parameters such as curing pressure. 43…”

Section: Morphology Studymentioning

confidence: 99%

Numerical simulation methodology for mode II delamination of quasi-isotropic quasi-homogeneous composite laminates

Johar

Israr

Low

et al. 2017

Journal of Composite Materials

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“…The propagation of the crack was initiated when the developed micro‐cracks combined at the crack's tip. The mode II delamination loading condition generally involves interfacial fracture within the matrix/fiber and pure fracture in the polymer 101,102 . At 30°C, test results revealed that by adding 0.1 wt% of SCF in GE, the value of G IIC improved by 20.45% more than neat GE.…”

Section: Resultsmentioning

confidence: 99%

“…The mode II delamination loading condition generally involves interfacial fracture within the matrix/fiber and pure fracture in the polymer. 101,102 At 30 C, test results revealed that by adding 0.1 wt% of SCF in GE, the value of G IIC improved by 20.45% more than neat GE. As stated earlier, it might be the uniformly distributed SCF in the matrix (in Figure 9A) and including SCF in the interlayer improves the delamination resistance by providing a bridging, hence requiring extra energy to develop the crack in the interlaminar domain, which consequences in turn in increased ILFT.…”

Section: Mode-ii Interlaminar Fracture Toughnessmentioning

confidence: 99%

Temperature‐dependent inter‐laminar fracture behavior of waste short carbon fiber embedded glass fiber/epoxy composites

2023

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Delamination is one of the life‐limiting failure modes for fiber reinforced polymer (FRP) composite composites resulting in poor damage tolerance, as this failure mode occurs at considerably lower loads. Owing to the enormous demand and mass production of FRP composites, a large amount of fiber waste is produced worldwide. This triggers concern about utilizing these fiber wastes for some valuable applications. The present study aims to improve the overall damage tolerance of laminated glass/epoxy composites via the introduction of waste short carbon fibers (SCFs) reinforcement in the epoxy matrix. The effect of various SCF contents (0.1, 0.3, and 0.5 wt%) in glass fiber/epoxy composites were evaluated experimentally for their interlaminar fracture toughness in terms of both crack development and propagation under mode I and II interlaminar fracture toughness tests, at elevated temperatures (30, 50, and 70°C). Based on the experimental results, glass/epoxy composite with 0.1 wt% of SCF revealed 13.49% and 20.45% increment in mode I and II interlaminar fracture toughness, respectively, at ambient temperature. A positive reinforcement effect could be noticed for GIC and GIIC values up to 50°C. However, due to residual interfacial stresses, interfacial debonding, and epoxy softening, a negative reinforcement effect could be noticed at 70°C. Delamination initiation and crack propagation mechanisms have been explored at elevated temperatures. Fractographic studies have been carried out using a scanning electron microscope to identify the failure mechanisms.

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“…In contrast, the stiffness of the hybrids rose with the amount of fibre. Such distinctions could be understood by the interactions among fibres and the matrix 18 . In comparison to a fibre made with fibre loading, hybrid composites using this material, which was before fibres and compatible with PP-g-MA, increased by 28 percentage points and 46.5%, respectively.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Experimental investigations of bagasse ash strands featuring variable surface influence on polypropylene based polymer composites

Richard

2023

International Conference on Mathematical and Statistical Physics, Computational Science, Education and Communication (ICMSCE 20

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Effects of curing pressure on mode II fracture toughness of uni-directional GFRP laminates

Cited by 19 publications

References 20 publications

Numerical simulation methodology for mode II delamination of quasi-isotropic quasi-homogeneous composite laminates

Numerical simulation methodology for mode II delamination of quasi-isotropic quasi-homogeneous composite laminates

Temperature‐dependent inter‐laminar fracture behavior of waste short carbon fiber embedded glass fiber/epoxy composites

Experimental investigations of bagasse ash strands featuring variable surface influence on polypropylene based polymer composites

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