Interfacial Fracture Toughness Assessment of a New Titanium–CFRP Adhesive Joint: An Experimental Comparative Study

Tsokanas, Panayiotis; Λούτας, Θεόδωρος; Nijhuis, P.

doi:10.3390/met10050699

Cited by 21 publications

(8 citation statements)

References 21 publications

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“…Due to the mismatch between the materials on both sides of the interface, mixed-mode states produce inherently in the crack tip. The stress intensity factors in the interface crack tip calculated for the modified Arcan sample are simply the real and imaginary parts of a complex tress intensity factor K = K1 + iK2 (Choupani, 2008b;Mirsayar et al, 2014;Tsokanas et al, 2020). For an interfacial crack between two dissimilar isotropic materials with Young's moduli E1 and E2, Poisson's ratios v1 and v2, shear moduli µ1 and µ2, and biomaterial constant β, the strain energy release rate for plane strain condition can be calculated as:…”

Section: Cohesive Interfacial and Interlaminar Fracture Mechanicsmentioning

confidence: 99%

Fracture characterization of bonded composites: A comparative study

Choupani¹,

Torun²

2022

10.5267/j.esm

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Bonded joints have important benefits over conventional joining techniques such as rivets, welding, bolts and nuts in structural applications, particularly for components prepared of composite or polymeric materials. Due to the involvement of many geometric, material and construction variables, and the complex fracture and mechanical modes offered in the bonded joints, a proper consideration of fracture behavior is required to fully achieve their benefits. The fractures in bonded joints are mainly of three types; interlaminar (delamination), adhesive (interfacial) and cohesive crack. For a particular defect, crack propagation may occur in the tensile (mode I), the shear (mode II), and the tear (mode III) and their combinations (mixed mode). This study deals with topics such as theories of bonded composite joints and repairs, finite element analysis and fracture-based analysis and tests of mixed-mode cohesive, interfacial and interlaminar fracture mechanics. By employing geometrical factors extracted from finite element analysis and experimental results obtained from a modified Arcan test fixture, the mixed-mode cohesive, interfacial, and interlaminar fracture toughness are determined and fracture surfaces obtained are discussed.

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Section: Cohesive Interfacial and Interlaminar Fracture Mechanicsmentioning

confidence: 99%

Fracture characterization of bonded composites: A comparative study

Choupani¹,

Torun²

2022

10.5267/j.esm

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“…In recent years the connection of different materials has become more and more popular due to the development, in particular, of composite materials and bonding techniques. The number of such solutions has increased drastically in many industries, particularly in the automotive or aviation industry and others and is reflected by the growing year-to-year number of papers [30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…[43][44][45]. The main failure forms of the adhesive joints are adhesive failure, cohesive failure, thin-layer cohesive failure, stock-break failure, fiber-tear and light-fiber-tear failure and adherend failure outside the joint [38,44,45]. The significant influence on the joint strength has a suitable selection of the adhesive material.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Experimental and Numerical Study of Metal Element with Notches Reinforced by Composite Materials

2021

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The presented study is related to the application of the composite overlays used in order to decrease the effect of the stress concentrations around the cut-outs in structural metal elements. The proposed approach with the application of the digital image correlation extends the recently presented studies. Such structural elements with openings of various shapes have been accommodated for a wide range of industrial applications. These structures exhibit certain stress concentrations which decrease their durability and strength. To restore their strength, various reinforcing overlays can be used. In the present paper, the flat panel structure without and with the composite overlays made of HEXCEL TVR 380 M12/26%/R-glass/epoxy is under the experimental and the numerical study. Particular attention is paid to the investigation of the samples with the rectangular holes, which for smooth rounded corners offer a higher durability than the samples with the circular hole of the same size. The experimental results are obtained for the bare element and are reinforced with composite overlay samples. The experimental results are obtained with the use of the Digital Image Correlation method, while the numerical results are the product of the Finite Element Analysis. In the numerical analysis, the study of the shape, size and fiber orientation in applied overlays is done. The reduction of the stress concentration observed in opening notches has confirmed the effectiveness of the overlay application. In the investigated example, the application of the square composite overlay increased the structure strength even by 25%.

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“…The most common reinforcements are glass, aramid, and carbon fibers. The production of carbon fibers has enabled the development of new composite materials with high strengths and low densities [3]. These materials are widely preferred in various applications, due to their high specific strength and modulus [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tool Wear and Delamination in Milling CFRPs with TiAlN- and TiN-Coated Tools

et al. 2020

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Carbon fiber-reinforced polymers (CFRPs) have very good mechanical properties, such as extremely high tensile strength/weight ratios, tensile modulus/weight ratios, and high strengths. CFRP composites need to be machined with a suitable cutting tool; otherwise, the machining quality may be reduced, and failures often occur. However, as a result of the high hardness and low thermal conductivity of CFRPs, the cutting tools used in the milling process of these materials complete their lifetime in a short cycle, due to especially abrasive wear and related failure mechanisms. As a result of tool wear, some problems, such as delamination, fiber breakage, uncut fiber and thermal damage, emerge in CFRP composite under working conditions. As one of the main failure mechanisms emerging in the milling of CFRPs, delamination is primarily affected by the cutting tool material and geometry, machining parameters, and the dynamic loads arising during the machining process. Dynamic loads can lead to the breakage and/or wear of cutting tools in the milling of difficult-to-machine CFRPs. The present research was carried out to understand the influence of different machining parameters on tool abrasion, and the work piece damage mechanisms during CFRP milling are experimentally investigated. For this purpose, cutting tests were carried out using a (Physical Vapor Deposition) PVD-coated single layer TiAlN and TiN carbide tool, and the abrasion behavior of the coated tool was investigated under dry machining. To understand the wear process, scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS) was used. As a result of the experiments, it was determined that the hard and abrasive structure of the carbon fibers caused flank wear on TiAlN- and TiN-coated cutting tools. The best machining parameters in terms of the delamination damage of the CFRP composite were obtained at high cutting speeds and low feed rates. It was found that the higher wear values were observed at the TiAlN-coated tool, at the feed rate of 0.05 mm/tooth.

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Interfacial Fracture Toughness Assessment of a New Titanium–CFRP Adhesive Joint: An Experimental Comparative Study

Cited by 21 publications

References 21 publications

Fracture characterization of bonded composites: A comparative study

Fracture characterization of bonded composites: A comparative study

Preliminary Experimental and Numerical Study of Metal Element with Notches Reinforced by Composite Materials

Experimental Study on Tool Wear and Delamination in Milling CFRPs with TiAlN- and TiN-Coated Tools

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