Mode I and mode <scp>II</scp> delamination of carbon/glass/epoxy hybrid composite: A statistics‐based analysis

Monticeli, Francisco Maciel; Costa, Midori Yoshikawa Pitanga; Cioffi, Maria Odila Hilário; Voorwald, Herman Jacobus Cornelis

doi:10.1002/pc.26098

Cited by 9 publications

(9 citation statements)

References 49 publications

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“…Because carbon fiber has a small diameter, the aggregation of fiber strands is greater than in glass fiber, resulting in smaller resin‐rich regions. A similar phenomenon was observed by Monticeli et al [ 23–25 ]…”

Section: Fractography Of Laminatessupporting

confidence: 88%

Post‐curing and fiber hybridization effects on mode‐II interlaminar fracture toughness of glass/carbon/epoxy composites

et al. 2023

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Failure by delamination is one of the primary concerns in laminated composites. The development and progression of the delamination results in the degradation of composite stiffness affecting its structural integrity and may ultimately result in composite structure failure. Therefore, knowledge of the evolution of delamination resistance and the factors which affect the delamination in composites is of utmost importance for the selection of materials.This study investigates the effect of fiber hybridization and post-curing on mode-II interlaminar fracture toughness (G IIC ) of Glass/Carbon/Epoxy (GCE) composites. Carbon/Epoxy (CE), Glass/Epoxy (GE), and GCE composite laminates were molded employing the process of hand layup technique and postcured at different temperatures. GE laminates exhibited a superior load for delamination and deformation compared to CE and GCE laminates. The hybrid GCE laminates exhibited higher interlaminar fracture toughness compared to non-hybrid GE and CE laminates, which can be attributed to the synergetic effect of Carbon and Glass fibers. The laminates post-cured at 180 C exhibited higher fracture toughness in their corresponding groups. The delaminated surfaces of CE, GE, and GCE laminates were further examined under Scanning electron microscopy (SEM) to understand the effect of post-curing and fiber hybridization on mode-II interlaminar fracture toughness.

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Section: Fractography Of Laminatessupporting

confidence: 88%

Post‐curing and fiber hybridization effects on mode‐II interlaminar fracture toughness of glass/carbon/epoxy composites

et al. 2023

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Section: Statistical Modelsmentioning

confidence: 99%

“…A higher β value gives a uniform distribution in load while a lower β ≤ 1 value gives a larger scatter in load. 22,36 These parameters can be determined using equation (12) in the ANOVA tool, 37 this is a linear regression equation.where F is the cumulative failure probability of N samples sorted in order of increasing load = (i=0.3)N+0.4 38 for a specific sandwich panel type; ∑1Ni varies from 1 to 3 (i = 1 for sample 1, i = 2 for sample 2, etc. ), 39 the data from the three samples data was used for modeling; N is the total number of samples used for each type of sandwich panel, which is equal to three.…”

Section: Theoretical Modelingmentioning

confidence: 99%

Influence of face sheet thickness on flexural strength characteristics of carbon/epoxy/Nomex honeycomb sandwich panels

Naresh

Alia

Cantwell

et al. 2023

Jnl of Sandwich Structures & Materials

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This study presents the findings of an investigation into the effect of varying the thickness of a carbon/epoxy face sheet of a Nomex honeycomb sandwich panel on its the flexural properties. The thickness (hs) of the face sheet was varied by increasing the number of plies from one 0.25 mm thick layer to eight such layers, giving a total nominal thickness of 2.0 mm, whilst maintaining a constant thickness of the core. The flexural properties of the sandwich panels were investigated through a series of three- and four-point bending tests. A particular focus was on identifying changes in the failure mode with increasing face sheet thickness. The flexural properties of the sandwich panels were predicted using sandwich beam theory, where the deviation from the experimental values was shown to be less than 13%. A two parameter Weibull distribution model was used to predict the maximum flexural load using an analysis of variance (ANOVA) tool and an excellent level of correlation was observed with the experimental values. The difference between the predicted maximum load values and the experimental results was below 5% in all cases. A brittle mode of failure was observed in the thickest panel. The sandwich panel based on 1.5 mm thick face sheet was identified as being the most appropriate design, both in terms of strength and stiffness.

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“…[6] Hybridization of natural fibers with synthetic fibers is often recommended as a viable solution to remove these limitations. [7][8][9][10][11] The mechanical strength of E-glass fiber is higher (2000-3500 MPa) than the natural fibers like kenaf, jute, flax, sisal, coir, and hemp (393-1500 MPa). However, the density of natural fibers is far lower (1.2-1.6 g/cc) compared to E-glass fibers ($2.5 g/cc).…”

Section: Introductionmentioning

confidence: 99%

Effect of glass fiber hybridization on the mechanical properties of unidirectional, alkali‐treated kenaf‐epoxy composites

Verma

Shukla

2022

Polymer Composites

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Due to environmental issues and high cost of synthetic fibers, natural or cellulosic fibers have emerged as a promising reinforcement for polymer composites. The hybridization of natural fiber with synthetic fiber is a useful technique to improve the mechanical properties instead of using the natural fibers alone. This research aims to evaluate the influence of glass fiber hybridization on the mechanical properties of continuous, unidirectional, alkali (NaOH)‐treated kenaf‐epoxy composites. At first, the effect of treatment of various concentrations (3, 5, 7, and 9% w/v) of NaOH on the structure of single kenaf fiber was characterized using XRD, SEM, FTIR, and tensile testing. At the optimum 5% alkali concentration the tensile strength, modulus, and %elongation of the kenaf fibers were enhanced by 81%, 114%, and 42%, respectively. The effect of hybridization of 5% NaOH treated kenaf along with glass fiber on the improvement in tensile, flexural, and impact properties for hand laid kenaf‐glass‐epoxy hybrid composite laminates was established. The overall matrix to fiber weight ratio of five different layup sequence laminates was maintained constant at 70:30. It can be concluded from the obtained results that the 15% glass and 15% kenaf fiber hybridized composites exhibited the maximum increment in tensile strength and modulus (68.5% and 19.5%, respectively) in comparison to the unhybridized composites. Further, the flexural strength and modulus were also improved by 21% and 67%, respectively, and the impact strength by 153%. The SEM fractography proved that alkali treatment of fibers improved the fiber‐matrix interfacial bonding whereas fiber breakage, fiber pull‐out and debonding were established as the main fracture mechanisms of hybrid composites. The findings of the present investigation on kenaf‐glass hybrid composites corroborate that they are suitable for secondary structural applications in construction and automobile sectors.

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Mode I and mode II delamination of carbon/glass/epoxy hybrid composite: A statistics‐based analysis

Cited by 9 publications

References 49 publications

Post‐curing and fiber hybridization effects on mode‐II interlaminar fracture toughness of glass/carbon/epoxy composites

Post‐curing and fiber hybridization effects on mode‐II interlaminar fracture toughness of glass/carbon/epoxy composites

Influence of face sheet thickness on flexural strength characteristics of carbon/epoxy/Nomex honeycomb sandwich panels

Effect of glass fiber hybridization on the mechanical properties of unidirectional, alkali‐treated kenaf‐epoxy composites

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