High-cycle fatigue analysis of adhesively bonded composite scarf repairs

Moreira, R.D.F.; Moura, M.F.S.F. de; Silva, F.G.A.; Reis, J.P.

doi:10.1016/j.compositesb.2020.107900

Cited by 22 publications

(4 citation statements)

References 49 publications

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“…Overall, the findings indicate that decreasing the scarf angle results in an improvement in the fatigue strength of scarf joints, driven by an increase in the bonded area. This is consistent with the conclusions drawn in other studies [53][54][55]. Scarf joints exhibited a higher fatigue life than butt joints of equal CFRP adherends thickness, regardless of the scarf angle.…”

Section: Joint Configuration and Geometrysupporting

confidence: 93%

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Malekinejad,

Carbas,

Akhavan-Safar

et al. 2023

Materials

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Adhesive bonding is widely seen as the most optimal method for joining composite materials, bringing significant benefits over mechanical joining, such as lower weight and reduced stress concentrations. Adhesively bonded composite joints find extensive applications where cyclic fatigue loading takes place, but this might ultimately lead to crack damage and safety issues. Consequently, it has become essential to study how these structures behave under fatigue loads and identify the remaining gaps in knowledge to give insights into new possibilities. The fatigue life of adhesively bonded composite joints is influenced by various parameters, including joint configuration and material properties of adherends and adhesive. Numerous studies with varying outcomes have been documented in the literature. However, due to the multitude of influential factors, deriving conclusive insights from these studies for practical design purposes has proven to be challenging. Hence, this review aims to address this challenge by discussing different methods to enhance the fatigue performance of adhesively bonded composite joints. Additionally, it provides a comprehensive overview of the existing literature on adhesively bonded composite joints under cyclic fatigue loading, focusing on three main aspects: Adherends modification, adhesive modification, and joint configurations. Since the effect of modifying the adhesive, adherends, and joint configurations on fatigue performance has not been comprehensively studied in the literature, this review aims to fill this gap by compiling and comparing the relevant experimental data. Furthermore, this review discusses the challenges and limitations associated with the methods that can be used to monitor the initiation and propagation of fatigue cracks.

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Section: Joint Configuration and Geometrysupporting

confidence: 93%

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Malekinejad,

Carbas,

Akhavan-Safar

et al. 2023

Materials

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“…This assumption is applicable only when the joints are subjected to higher load levels, which often have a limited practical application. Moreira et al 9 pointed out that the stiffness degradation of scarf joint repairs CFRP composites exhibited stable damage growth for most of the fatigue life followed by sudden failure at the end of the test. At lower stress level (40% of ultimate strength), Shenoy et al 10 showed that the stiffness degradation of the bonded SLJs is not changed during 85% of fatigue lifetime after the crack initiation period and suddenly fractured due to acceleration of crack growth.…”

Section: Introductionmentioning

confidence: 99%

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Khashaba

2022

Journal of Composite Materials

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In this study, fatigue results of the scarf adhesive joints (SAJs) were extensively analyzed regarding the effect of the adhesive materials (neat epoxy (NE), and SiC and Al2O3-nanocomposite), bond thickness (0.17 mm and 0.25 mm) on their dynamic properties, which include loss factor (tan δ), loss modulus ( E''), dissipated energy ( U d), potential energy ( U p), and storage modulus ( E'). Safe fatigue lives of the NE, SiC, and Al2O3-SAJs were estimated at different reliability levels. The experimental measurements revelated that reducing the adhesive layer thickness from 0.25 mm to 0.17 mm result in enhancing the tensile strength and stiffness of the SiC-SAJs by 9.6% and 4.4%, respectively, in return of 9.5% and 5.4% for the Al2O3-SAJ relative to the NE-SAJ. The strength and stiffness of the SiC-SAJs with 0.17 mm bond thickness are higher than those of the Al2O3-SAJ by 15.4% and 3.3%, respectively. The highest improvement of 22.0% in the fatigue strength was occurred for the SiC-SAJ with bond thickness of 0.17 mm in return of 4.8% for the Al2O3-SAJ. The U p was used for the first time (except author works) for monitoring and predicting the damage in the adhesive joints practically the change in the enclosed area of the hysteresis loop is too small to cause a large variation in the tan δ, E'', and U d. Damping factor of the NE-SAJs is marginally increased with the stress levels compared to the aggravated increase of both SiC and Al2O3-SAJs. Zhang model predicts well the potential energy and storage modulus specially at higher stress levels.

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“…Bhise et al [7] have investigated the optimization of circular patches for the reinforcement of damaged carbon fibers under unidirectional tensile conditions, using genetic algorithms. Moreira et al [8] have carried out the scarf configuration for bonded repair technique under a static and dynamic three-point bending, using finite element analysis method, in order to simulate its strength and fatigue life time. Other researchers such [9], have revealed the effect of hygrothermal loading on stress-strain behavior especially for composite materials, Nachtane et al [10] have clarified this effect in an experimental study, showing that the reduction of fracture strength because of the moisture absorption at 50°C increase with the increase of the strain rate.…”

Section: Introductionmentioning

confidence: 99%

Composite lay-up configuration effect on double and single sided bonded patch repairs

Achour

Mili

2022

Frattura Ed Integrità Strutturale

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Understanding the failure modes of damaged or cracked structures and repaired by bonding a composite patch is an essential point to improve its resistance to failure and subsequently extend its service life. In the present study, a 3D finite element analysis using ANSYS software was performed to elucidate the failure modes of the repaired structures by double and single sided bonded composite. The plate is represented by an aluminum plate (Al2024 T3), cracked at the edge and repaired by three types of laminates, with different fiber orientation in order to determine its effect on the repair. The contact interfaces patch-adhesive and aluminum-adhesive were modeled by cohesive zone modeling (CZM) using bilinear interface of delamination (BID) method to determine the failure at the adhesive layer. The obtained results show the importance of the impact of the composite patch fiber orientation on the structure design for suitable repair.

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High-cycle fatigue analysis of adhesively bonded composite scarf repairs

Cited by 22 publications

References 49 publications

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Enhancing Fatigue Life and Strength of Adhesively Bonded Composite Joints: A Comprehensive Review

Potential energy as a new approach for detection and monitoring of fatigue damage in scarf adhesive joints modified with nanoparticles

Composite lay-up configuration effect on double and single sided bonded patch repairs

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