Strength calculation of composite single lap joints with Fiber-Tear-Failure

Rahman, N.; Sun, C. T.

doi:10.1016/j.compositesb.2014.03.004

Cited by 18 publications

(4 citation statements)

References 17 publications

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“…This means that matrix-dominated failure occurred when the same material was used. However, in the case of CF-GF, tear-off cohesion failure including fiber fracture was observed, which can be evidenced by the black color of CFRC ply failure [41]. These results can support that GFRC has higher ILSS than CFRC.…”

Section: Resultsmentioning

confidence: 62%

Evaluation of interlaminar shear strength of co-cured fiber-reinforced fabric composite structures by lap joint method

Jeon

Lee

2023

Funct. Compos. Struct.

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Interlaminar shear strength (ILSS) indicates the resistance to interlaminar delamination of fiber-reinforced composite (FRC) structures. The short beam shear (SBS) method has been commonly used for ILSS measurement, but unwanted failure modes can appear like a compressive or tensile failure in surface, and diagonal shear failure, causing poor measurement accuracy. The lap joint method has advantage that leading to a clear measurement of the shear strength. This paper proposed the lap joint method for extracting ILSS values of co-cured carbon or glass fiber-reinforced fabric composites (CFRC or GFRC) by minimizing the discrepancy between the experiment and finite element analysis of ILSS test. The lap joint method can compensate for the shortcomings of the SBS method. The calculated ILSS based on the lap joint method (LJ-ILSS) with correction factors showed similar values to the ILSS values by SBS method (SBS-ILSS) done by our work and other works of literature. Therefore, the proposed lap joint method has shown potential as a method to measure ILSS of the co-cured fiber-reinforced fabric composites, but also it can be extended to other types of fiber-reinforced composites.

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Section: Resultsmentioning

confidence: 62%

Evaluation of interlaminar shear strength of co-cured fiber-reinforced fabric composite structures by lap joint method

Jeon

Lee

2023

Funct. Compos. Struct.

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“…SEM analysis was performed on the fracture surface of the joints bonded with neat epoxy and the nanocomposites after fatigue tests performed under different stress levels from 0.5 to 1 in order to investigate their failure mechanisms, and representative images are shown in Figure 7. When neat epoxy was used as the adhesive (Figure 7a), the presence of fiber tracks, textured microflow and cusps observed on the fracture surface of the sample, combined with small regions covered by debris from the adhesive, suggests the coexistence of both adhesive and cohesive failure mechanisms, with the adhesive dominating the system's failure over the cohesive [35][36][37]. The fracture surface of the nanocomposites tested under identical conditions (Figure 7b-g) showed similar features to those found for the samples bonded with neat epoxy, with both the cohesive and the adhesive failure mechanisms coexisting.…”

Section: Failure Mechanism Of the Adhesively Bonded Jointsmentioning

confidence: 99%

Static and Dynamic Mechanical Behavior of Carbon Fiber Reinforced Plastic (CFRP) Single-Lap Shear Joints Joule-Bonded with Conductive Epoxy Nanocomposites

Huang,

Kinloch,

Vallés

2024

J. Compos. Sci.

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The potential of electrically conductive graphene nanoplatelets (GNPs)/epoxy, multi-walled carbon nanotubes (MWNCTs)/epoxy and hybrid GNPs-MWCNTs/epoxy nanocomposites as adhesives for out-of-autoclave (OoA) and in-the-field CFRP repair via Joule heat curing was investigated. Scanning electron microscopy revealed a good dispersion of the nanoparticles in the matrix in all the nanocomposite adhesives above their percolation thresholds, which led to a homogeneous distribution of the heat generated during Joule CFRP repair. The joints bonded with neat epoxy and the nanocomposites showed similar lap shear strengths, with the addition of nanoparticles enhancing the fatigue performance of the adhesively bonded joints relative to when neat epoxy was used as an adhesive and oven-cured. The interfacial and cohesive failure mechanisms were found to coexist in all the cases, with an increasing dominance of the cohesive when nanofillers were embedded into the adhesive. No effect of the specific type of nanofiller incorporated into the epoxy as the conductive component was observed on the mechanical performance of the bonded joints, with the adhesives containing MWCNTs showing similar results to those filled with GNPs at considerably lower loadings due to their lower percolation thresholds. The independence of the properties regardless of the curing method highlights the promise of these Joule-cured adhesives for industrial applications.

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“…They calculated the size of the critical fields with the help of finite element analysis by using the known collapse loads of single lap joints. As a result, they found that the Azzi-Tsai criterion (Norris) was appropriate for estimating the stress of fiber tear damage in single rots [42]. In a paper in 2018, Selahi made an error analysis on an ANSYS Workbench by applying shear and bending loads to double lap joints with hybrid bonded and single bolted laminated composite adhesions exposed to axial effects by using three-dimensional finite element simulation.…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis in Bonded, Bolted and Bolted-Bonded Joints, Single Lap Joints, Metal/Composite Plates

Sadık,

Karabudak

2023

Applied Sciences

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Today, especially in many fields that require structural durability, such as the aerospace and automotive industries, there has been a need to use different bonding techniques separately or together in order to use materials together with different mechanical properties. In this study, stress and damage analysis of single lap joints, bonding and bolt-bonding metal/composite joints under tensile loads were performed. The nine kinds of single lap joint models in different combinations (bonded, bolted and bolt-bonded) were prepared by using acrylic adhesive (Acrytron 1E1) and 100-25-3 mm in size; AZ91/AZ91, AZ91-carbon fiber and carbon fiber-carbon fiber plates. Some comparisons were carried out by examining the stresses and deformations that occur in joint models exposed to tensile and 4-point bending tests. As a result of the tensile test, it was determined that the highest maximum tensile stress occurred in AZ91-CF bolt-bonded samples. In the four-point bending test, the maximum shear force value was determined in the CF-CF bolted-bonded samples.

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Strength calculation of composite single lap joints with Fiber-Tear-Failure

Cited by 18 publications

References 17 publications

Evaluation of interlaminar shear strength of co-cured fiber-reinforced fabric composite structures by lap joint method

Evaluation of interlaminar shear strength of co-cured fiber-reinforced fabric composite structures by lap joint method

Static and Dynamic Mechanical Behavior of Carbon Fiber Reinforced Plastic (CFRP) Single-Lap Shear Joints Joule-Bonded with Conductive Epoxy Nanocomposites

Strength Analysis in Bonded, Bolted and Bolted-Bonded Joints, Single Lap Joints, Metal/Composite Plates

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