Influence of dissimilar composite adherends on the mechanical adhesion of bonded joints for small blade wind turbine applications

Hunter-Alarcón, R.A.; Leyrer, J.; Leal, Eduardo Souza; Vizán, Antonio; Pérez, Juan Carlos Raya; Silva, Lucas F. M. da

doi:10.1016/j.ijadhadh.2018.02.018

Cited by 21 publications

(7 citation statements)

References 14 publications

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“…Overall, the failure load of the single lap joint reduces with increasing bondline thickness. This result is in agreement with the observation made in the published literature on the failure load of GFRP-based single lap joints subjected to tensile lap shear load [8]. A line of best fit is also drawn to confirm this correlation, which showed a negative slope and has an R 2 value close to 95% confirming our overall observations.…”

Section: Assessment Of Intact Failure Loads Of Adhesive Joints With D...supporting

confidence: 93%

“…It can be seen that the leading edges are primarily composed of adhesively bonded composite laminates made of Glass Fiber Reinforced Plastic (GFRP) materials and have plies with layup oriented in ( [+45/−45/0] s ) material directions where a 0-degree layer is along the blade span. The main reasons for application of adhesive bonds over mechanical fastenings are their ability to facilitate in uniform stress distributions, and to join large and dissimilar adherends [8]. The adhesive bonds also include other advantages, such as high fatigue strength and corrosion resistances, while maintaining the integrity of the entire blade structure.…”

Section: Literature Review: Wind Turbine Blades Impact Loads and Dama...mentioning

confidence: 99%

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Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades

et al. 2021

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The leading edges of wind turbine blades are adhesively bonded composite sections that are susceptible to impact loads during offshore installation. The impact loads can cause localized damages at the leading edges that necessitate damage tolerance assessment. However, owing to the complex material combinations together with varying bondline thicknesses along the leading edges, damage tolerance investigation of blades at full scale is challenging and costly. In the current paper, we design a coupon scale test procedure for investigating bondline thickness effects on damage tolerance of joints after being subjected to localized impact damages. Joints with bondline thicknesses (0.6 mm, 1.6 mm, and 2.6 mm) are subjected to varying level of impact energies (5 J, 10 J, and 15 J), and the dominant failure modes are identified together with analysis of impact kinematics. The damaged joints are further tested under tensile lap shear and their failure loads are compared to the intact values. The results show that for a given impact energy, the largest damage area was obtained for the thickest joint. In addition, the joints with the thinnest bondline thicknesses displayed the highest failure loads post impact, and therefore the greatest damage tolerance. For some of the thin joints, mechanical interlocking effects at the bondline interface increased the failure load of the joints by 20%. All in all, the coupon scale tests indicate no significant reduction in failure loads due to impact, hence contributing to the question of acceptable localized damage, i.e., damage tolerance with respect to static strength of the whole blade.

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Section: Assessment Of Intact Failure Loads Of Adhesive Joints With D...supporting

confidence: 93%

Section: Literature Review: Wind Turbine Blades Impact Loads and Dama...mentioning

confidence: 99%

Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades

et al. 2021

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“…Increasing the adherends' stiffness diminishes stress at the overlap edges and, consequently, increases the joint strength. Hunter-Alarcon et al [51] showed that the manufacturing process of composite plates (hand lay-up and Vacuum Infusion with different pressures) in dissimilar lap shear joint has more effect on the joint with thick adhesive (here 1.3 mm) in comparison to thin adhesive (here 0.7 mm). Reducing the resin concentration within the layers of glass fibre lamination increases the vacuum pressure, consequently, increases the strength of dissimilar lap shear joint.…”

Section: Tensile Loadingmentioning

confidence: 99%

Hybrid and adhesively bonded joints with dissimilar adherends: a critical review

Kanani

Green

Hou

et al. 2020

Journal of Adhesion Science and Technology

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This paper reviews the reported literature on dissimilar (non-matched adherend) adhesively bonded joints (ABJs), currently used bonding processes, and the mechanisms by which these types of joints fail when subjected to structural loading and environmental conditions. Additionally, approaches to improve the performance of dissimilar ABJs, through geometrical and material modifications, are also discussed. Many studies have reported on the strength and failure behaviours of adhesively bonded joints, but of those, few have reported on the performance of dissimilar ABJs. Unlike matched ABJs, the absence of accepted design approaches for dissimilar ABJs arises from their inherent inhomogeneity, which introduces complexities in load transfer mechanisms, in the distribution of stresses through the joint, and in the mechanisms by which the joint ultimately fails. Several authors have proposed approaches to improve the performance of adhesively bonded joints, variously through geometrical or material modification means, but there remains unmet research needs to better understand novel dissimilar ABJ designs.

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“…An easy and effective way to join structural parts without drilling is adhesive bonding [13]. In recent years, particularly adhesive bonding applications of metal to composite parts have increased in automotive, boat structures, marine, aerospace, and wind turbine blades [14][15][16][17]. Surface pretreatments for adhesive bonding should ensure the removal of all impurities (e.g., lubricants, dirt, weak corrosion layers, etc.)…”

Section: Introductionmentioning

confidence: 99%

Atmospheric plasma treatment effect on shear strength of GFRP-Aluminum adhesively bonded lap joints

AYAZ,

OZDEMİR,

ERCAN

et al. 2024

IJCESEN

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The objective of this study is to investigate the effect of air (dielectric barrier discharge) DBD plasma treatment on the bonding strength of adhesively bonded glass fiber-reinforced epoxy composite-aluminum lap joints. The bonding performance of lap joints produced by the plasma treatment was compared with that of untreated and peel-ply surface treatments. Water contact angles of the substrates were measured for untreated, peel-ply, and plasma surface-treated substrates. Experimental results showed that plasma-treated aluminum and GFRP substrates increased the wettability properties and thus shear strength of adhesively bonded GFRP-Al joints increased. After the shear tests, the fracture surfaces of the substrates were visually examined and three different damage modes were observed, including light fiber tear failure, adhesive failure, and thin layer cohesive failure modes.

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Influence of dissimilar composite adherends on the mechanical adhesion of bonded joints for small blade wind turbine applications

Cited by 21 publications

References 14 publications

Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades

Bondline Thickness Effects on Damage Tolerance of Adhesive Joints Subjected to Localized Impact Damages: Application to Leading Edge of Wind Turbine Blades

Hybrid and adhesively bonded joints with dissimilar adherends: a critical review

Atmospheric plasma treatment effect on shear strength of GFRP-Aluminum adhesively bonded lap joints

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