Tensile behaviour of three-dimensional carbon-epoxy adhesively bonded single- and double-strap repairs

Campilho, R.D.S.G.; Moura, M.F.S.F. de; Ramantani, Dimitra A.; Morais, J.J.L.; Domingues, J. J. M. S.

doi:10.1016/j.ijadhadh.2009.02.004

Cited by 97 publications

(55 citation statements)

References 37 publications

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“…In addition, failure was demonstrated to take place progressively as energy dissipates gradually at the crack tip [4,[7][8][9][10][11]13]. Furthermore, failure generally occurs in the adhesive layer with a lower stiffness than that of the adherends, which has been proved by previous investigations [4,[8][9][10][11][14][15].…”

Section: Introductionmentioning

confidence: 86%

“…Furthermore, failure generally occurs in the adhesive layer with a lower stiffness than that of the adherends, which has been proved by previous investigations [4,[8][9][10][11][14][15]. The onset of damage can be predicted without requiring any initial crack using the existing stress-or strain-based criteria [13]. However, the obvious disadvantage of these methods is the mesh dependence caused by the singularities at the edge of the adhesive.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the complex failure behavior of the adhesive joint, it is difficult to obtain a universal failure criterion to various situations. Alternatively, cohesive zone models (CZM) can simulate the damage onset and growth with mesh independence and dispensable initial crack, maintaining the possibility to characterize the behavior of the structure up to failure [7][8][9][10][11][12][13][14][15]. Especially, an efficient finite element computational method with the core of CZM was certified by Castagnetti et al [18], which showed that the socalled Tied Mesh method has the advantage of numerical precision and computational speed.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

Liao

Sawa

Huang

2014

International Journal of Adhesion and Adhesives

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a b s t r a c tThe load-bearing capacity and the damage level of the double scarf joint (DSJ) under combined loadings of tension and bending were investigated numerically, which takes into account the effects of scarf angle and adhesive type. A finite element method (FEM), which includes a mixed-mode cohesive zone model (CZM) with a bilinear shape, was employed to govern the interface separation behaviors. At the point corresponding to the ultimate loading, it was observed that the interface damage level of DSJ with the ductile adhesive is higher and more uniform than that of the joint with the brittle one. More than that, the numerical results illustrated that the failure of DSJ is controlled not only by the ultimate loading, but also by the applied displacement until complete failure. Therefore, the failure energy, which is defined as the integral of the loading with respect to the displacement, was adopted to estimate the joint performance. Subsequently, the numerical results showed that the failure energy of the joint with the ductile adhesive is higher than that of the joint with the brittle one. Furthermore, all the discussed characteristic parameters of a DSJ with a given adhesive, including ultimate loading, the von-Mises equivalent stress and interface damage level corresponding to the ultimate loading, and the failure energy, were inversely proportional to the scarf angle. Finally, through comparing with the existing experimental measurements, the adoptive method was validated.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

Liao

Sawa

Huang

2014

International Journal of Adhesion and Adhesives

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“…(4) is achieved at a given integration point damage grows and stresses are released, with the exception of normal compressive ones. A detailed description of this model can be found in the work of Campilho et al [28].…”

Section: Model Descriptionmentioning

confidence: 99%

“…The adhesive layer elastic stiffness in tension and shear (up to d 1,i , Fig. 1) is defined from the experimentally measured values of Young's modulus (E = 1850 MPa) and shear modulus (G = 650 MPa) [29], as detailed in the work of Campilho et al [28]. In the present work, the cohesive laws of the adhesive layer in pure modes I and II were estimated by Double Cantilever Beam (DCB) (mode I) and End-Notched Flexure (ENF) (mode II) tests using an inverse data fitting procedure [30][31][32].…”

Section: Cohesive Parametersmentioning

confidence: 99%

Experimental and numerical evaluation of composite repairs on wood beams damaged by cross-graining

Campilho

Moura

Barreto

et al. 2010

Construction and Building Materials

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Keywords:Wood Composite Repair Cohesive zone models Finite element analysis a b s t r a c t An experimental and Finite Element study was performed on the bending behaviour of wood beams of the Pinus Pinaster species repaired with adhesively-bonded carbon-epoxy patches, after sustaining damage by cross-grain failure. This damage is characterized by crack growth at a small angle to the beams longitudinal axis, due to misalignment between the wood fibres and the beam axis. Cross-grain failure can occur in large-scale in a wood member when trees that have grown spirally or with a pronounced taper are cut for lumber. Three patch lengths were tested. The simulations include the possibility of cohesive fracture of the adhesive layer, failure within the wood beam in two propagation planes and patch interlaminar failure, by the use of cohesive zone modelling. The respective cohesive properties were estimated either by an inverse method or from the literature. The comparison with the tests allowed the validation of the proposed methodology, opening a good perspective for the reduction of costs in the design stages of these repairs due to extensive experimentation.

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Local repair procedure for carbon‐fiber‐reinforced plastics by refilling with a thermoset matrix

Küchler

Staiger

Hund

et al. 2015

J of Applied Polymer Sci

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Textile-reinforced composites have given rise to an increasingly important key technology for lightweight construction in aerospace, automotive, civil engineering, and many other industries. Because there exists no suitable repair procedure for carbon-fiberreinforced plastics (CFRPs), damaged parts have to be replaced completely; this is extremely disadvantageous both ecologically and economically. With fiber-reinforced composites used being more and more often, fast and efficient methods for the local repair of damaged CFRPs are essential. In this article, a novel repair procedure for CFRP is presented. The thermal activation by IR radiation of oxide semiconductors was used to locally degrade the thermoset matrix of the damaged CFRP through the maintenance of its structural stability and properties. The matrix-free textile structure was then refilled with a thermoset epoxy matrix. Carbon fibers from the treated area were characterized with scanning electron microscopy, IR spectroscopy, thermogravimetric analysis, and subsequently, tensile strength for single fibers to verify the effectiveness of the procedure.

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Tensile behaviour of three-dimensional carbon-epoxy adhesively bonded single- and double-strap repairs

Cited by 97 publications

References 37 publications

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

Experimental and numerical evaluation of composite repairs on wood beams damaged by cross-graining

Local repair procedure for carbon‐fiber‐reinforced plastics by refilling with a thermoset matrix

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