Advances in Numerical Modelling of Adhesive Joints

Silva, Lucas F. M. da; Campilho, R.D.S.G.

doi:10.1007/978-3-642-23608-2_1

Cited by 97 publications

(92 citation statements)

References 196 publications

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“…Even though these analyses were promising, they had few limitations: stress/ strain predictions depend on the mesh size at the critical regions, while fracture criteria such as the Virtual Crack Closure Technique (VCCT) are restricted to Linear Elastic Fracture Mechanics (LEFM) and need an initial crack. CZM have been used in the last decade for the strength prediction of adhesive joints, as an add-in to FE analyses that allows simulation of damage growth within bulk regions of continuous materials or interfaces between different materials [7,8]. Compared to conventional FE, a much more accurate prediction is achieved, since different shapes can be developed for the cohesive laws, depending on the nature of the material or interface to be simulated.…”

Section: Introductionmentioning

confidence: 99%

“…The material/interfacial behaviour that the CZM law is simulating should always be the leading decision factor to select the most appropriate shape. Despite this fact, other issues should be taken into account [7]. In fact, the CZM law shape also influences the iterative solving procedure and the time required to attain the solution of a given engineering problem: larger convergence difficulties in the iterative solving procedure usually take place for trapezoidal rather than triangular CZM laws, due to the more abrupt change of stiffness in the cohesive elements during stress softening.…”

Section: Introductionmentioning

confidence: 99%

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Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer

Campilho

Banea

Neto

et al. 2013

International Journal of Adhesion and Adhesives

506

193

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Adhesively-bonded joints are extensively used in several fields of engineering. Cohesive Zone Models (CZM) have been used for the strength prediction of adhesive joints, as an add-in to Finite Element (FE) analyses that allows simulation of damage growth, by consideration of energetic principles. A useful feature of CZM is that different shapes can be developed for the cohesive laws, depending on the nature of the material or interface to be simulated, allowing an accurate strength prediction. This work studies the influence of the CZM shape (triangular, exponential or trapezoidal) used to model a thin adhesive layer in single-lap adhesive joints, for an estimation of its influence on the strength prediction under different material conditions. By performing this study, guidelines are provided on the possibility to use a CZM shape that may not be the most suited for a particular adhesive, but that may be more straightforward to use/implement and have less convergence problems (e.g. triangular shaped CZM), thus attaining the solution faster. The overall results showed that joints bonded with ductile adhesives are highly influenced by the CZM shape, and that the trapezoidal shape fits best the experimental data. Moreover, the smaller is the overlap length (LO), the greater is the influence of the CZM shape. On the other hand, the influence of the CZM shape can be neglected whe n using brittle adhesives, without compromising too much the accuracy of the strength predictions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer

Campilho

Banea

Neto

et al. 2013

International Journal of Adhesion and Adhesives

506

193

View full text Add to dashboard Cite

show abstract

“…Numerical techniques, specifically those based on the finite element method, have provided a means for analysing and predicting the failure of adhesive joints under various loading conditions. The finite element based methods may be classified as strength of materials, fracture mechanics and damage mechanics based methods [1].…”

Section: Introductionmentioning

confidence: 99%

Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

Mubashar

Ashcroft

Crocombe

2014

The Journal of Adhesion

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In recent years, cohesive elements based on the cohesive zone model (CZM) have been increasingly used within finite element analyses of adhesively bonded joints to predict failure. The cohesive element approach has advantages over fracture mechanics methods in that an initial crack doesn't have to be incorporated within the model. It is also capable of modelling crack propagation and representing material damage in a process zone ahead of the crack tip. However, the cohesive element approach requires the placement of special elements along the crack path and is, hence, less suited to situations where the exact crack path is not known a priori. The extended finite element method (XFEM) can be used to represent cracking within a finite element and hence removes the requirement to define crack paths or have an initial crack in the structure. In this paper a hybrid XFEM-cohesive element approach is used to model cracking in the fillet area using XFEM where the crack path is not known and then using cohesive elements to model crack and damage progression along the interface. The approach is applied to the case of an aluminium-epoxy single lap joint and is shown to be highly effective.

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“…Adhesives are progressively being applied in structures of several branches of engineering, which also makes certification-related issues more important, especially in industries such as aeronautics [1]. Because of this, it is highly important the availability of robust predictive techniques that can reliably be used as design tools, to allow minimization of experi-mentation during the design stages of products and structures without compromising the design process [2,3]. This will allow assessing the feasibility of joining during the fabrication process of components (e.g.…”

Section: Introductionmentioning

confidence: 99%

Adherend thickness effect on the tensile fracture toughness of a structural adhesive using an optical data acquisition method

Campilho

Moura

Banea

et al. 2014

International Journal of Adhesion and Adhesives

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Adhesive bonding is nowadays a serious candidate to replace methods such as fastening or riveting, because of attractive mechanical properties. As a result, adhesives are being increasingly used in industries such as the automotive, aerospace and construction. Thus, it is highly important to predict the strength of bonded joints to assess the feasibility of joining during the fabrication process of components (e.g. due to complex geometries) or for repairing purposes. This work studies the tensile behaviour of adhesive joints between aluminium adherends considering different values of adherend thickness (h) and the double-cantilever beam (DCB) test. The experimental work consists of the definition of the tensile fracture toughness (GIC) for the different joint configurations. A conventional fracture character-ization method was used, together with a J-integral approach, that take into account the plasticity effects occurring in the adhesive layer. An optical measurement method is used for the evaluation of crack tip opening and adherends rotation at the crack tip during the test, supported by a Matlab s sub-routine for the automated extraction of these quantities. As output of this work, a comparative evaluation between bonded systems with different values of adherend thickness is carried out and complete fracture data is provided in tension for the subsequent strength prediction of joints with identical conditions.

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Advances in Numerical Modelling of Adhesive Joints

Cited by 97 publications

References 196 publications

Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer

Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer

Modelling Damage and Failure in Adhesive Joints Using A Combined XFEM-Cohesive Element Methodology

Adherend thickness effect on the tensile fracture toughness of a structural adhesive using an optical data acquisition method

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