Effect of moisture on the adhesion of CFRP-to-steel bonded joints using peel tests

Arouche, Marcio Moreira; Budhe, S.; Alves, Lais; Freitas, Sofia Teixeira de; Barros, Sílvio de

doi:10.1007/s40430-017-0959-6

Cited by 28 publications

(16 citation statements)

References 33 publications

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“…Although bonded connection design is the easiest way for joining mechanical elements, it may be limited in terms of strength. By increasing the thickness and/or the size of the element, it becomes necessary to use bolted or welded joints [1][2][3][4][5][6][7]. Advantages of bolted joints, such as the ease of assembly and disassembly, are often preferred in many mechanical joining applications.…”

Section: Introductionmentioning

confidence: 99%

The failure stages of bolted double-lap metallic joints: experimental study

Abu-Sinna

Abd-Elhady

Atta

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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In this study, the effect of clamping force on the bolted double-lap joints has been investigated experimentally. The mechanical behavior of the present joint has been divided into several stages based on the sequence of failure. The commencement failure occurred in such joint is the sticking failure, i.e., loose of clamping effect. One of the main objectives of present investigation is to study the effect of tightening torque value (T = 0-30 Nm) on the sticking failure load, i.e., initiation of the relative sliding. Three different geometries (e/D = 1, 2, and 3) have been adopted to get different modes of failure, namely bearing, shear, and tensile. A steel sheet AISI 1006 with fixed width 30 mm and thickness 3 mm was used. The present experimental results showed six different stages identifying the mechanical behavior of the doublelap joint namely; sticking failure, bearing failure, shearing failure, ultimate strength, tensile/shear crack initiation (depending on the value of e/D), and lastly final failure. For e/D = 2 and 3, the maximum value of sticking failure load is obtained at T = 25 Nm, while T = 30 Nm for e/D = 1. Furthermore, for all values of e/D, the values of sticking failure load are approximately the same at T = 30 Nm. In the case of small values of tightening torque (T \ 25 Nm), the stiffness of the joint before sticking failure increased by increasing the value of e/D and T. The difference between the stiffness of joints with different values of e/D, e/D = 1-3, decreased by increasing the tightening torque.

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Section: Introductionmentioning

confidence: 99%

The failure stages of bolted double-lap metallic joints: experimental study

Abu-Sinna

Abd-Elhady

Atta

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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“…Composite-to-metal bonded specimens were manufactured using similar materials and methods of composite repair application to metal structures in offshore industry. [47] Specimens with two different geometries were produced, as shown in Figure 14. Carbon steel plates (ASTM A36) with 6.35 mm and 3.18 mm thickness were selected for the metal adherend.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the strain-based partitioning method for mixed-mode I+II fracture of bi-material cracks

Arouche

Freitas

Barros

2021

The Journal of Adhesion

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The goal of this paper is to evaluate the strain-based partitioning method (SBM), an analytical method based on beam analysis, for the mixed-mode fracture characterization of asymmetric cracks. The fracture energy is calculated at the crack tip of mixed-mode bending (MMB) test with asymmetric geometry and asymmetric material parameters. The fracture energy obtained using SBM is benchmarked against the widely applied Williams' partitioning method (WM) and numerical results from finite element models using the virtual crack closure technique (VCCT). Results show that WM produces inaccurate fracture modes in asymmetric conditions. However, if using SBM, the fracture mode ratio of bimaterial cracks was obtained with accuracy. SBM describes a coupling function between mode I and mode II fracture that allows the mode partitioning as long the specimen complies with a simple design criterion based on the longitudinal strain equivalence between arms. Experimental results of composite-to-metal bonded joints validate the results of the parametric study. SBM proves to be an easy and reliable solution for the mixed-mode fracture characterization of bi-material cracks.

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“…Under wet conditions, bond durability is tested, as water ingress is often cited as the main cause for environmental adhesion failure [ 145 ]. With successful metal bonding systems it is relevant to determine, as well, the resistance to bond line corrosion with exposure of the unprotected peel specimen to salt spray exposure [ 209 , 210 , 221 , 222 , 223 , 224 ], and to determine if the surface treatment does not have a negative effect on the fatigue properties of the metal substrate [ 225 ]. For final qualification of a new adhesive bonding system both peel testing and lap shear testing must be conducted in various environmental conditions [ 220 ], as well as with exposure to various fluids, such as solvents, hydraulic fluids, or de-icing fluids [ 226 ].…”

Section: Critical Overview Of the Connection Between Randd Efforts Amentioning

confidence: 99%

Review on Adhesives and Surface Treatments for Structural Applications: Recent Developments on Sustainability and Implementation for Metal and Composite Substrates

et al. 2020

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Using adhesives for connection technology has many benefits. It is cost-efficient, fast, and allows homogeneous stress distribution between the bonded surfaces. This paper gives an overview on the current state of knowledge regarding the technologically important area of adhesive materials, as well as on emergent related technologies. It is expected to fill some of the technological gaps between the existing literature and industrial reality, by focusing at opportunities and challenges in the adhesives sector, on sustainable and eco-friendly chemistries that enable bio-derived adhesives, recycling and debonding, as well as giving a brief overview on the surface treatment approaches involved in the adhesive application process, with major focus on metal and polymer matrix composites. Finally, some thoughts on the connection between research and development (R&D) efforts, industry standards and regulatory aspects are given. It contributes to bridge the gap between industry and research institutes/academy. Examples from the aeronautics industry are often used since many technological advances in this industry are innovation precursors for other industries. This paper is mainly addressed to chemists, materials scientists, materials engineers, and decision-makers.

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Effect of moisture on the adhesion of CFRP-to-steel bonded joints using peel tests

Abstract: Important note To cite this publication, please use the final published version (if applicable). Please check the document version above.

Cited by 28 publications

References 33 publications

The failure stages of bolted double-lap metallic joints: experimental study

The failure stages of bolted double-lap metallic joints: experimental study

Evaluation of the strain-based partitioning method for mixed-mode I+II fracture of bi-material cracks

Review on Adhesives and Surface Treatments for Structural Applications: Recent Developments on Sustainability and Implementation for Metal and Composite Substrates

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