Numerical and Experimental Analysis of Balanced and Unbalanced Adhesive Single-Lap Joints between Aluminium Adherends

Pinto, A. M. G.; Campilho, R.D.S.G.; Mendes, Isabel R.; Baptista, A. M.

doi:10.1080/00218464.2013.773258

Cited by 33 publications

(8 citation statements)

References 30 publications

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“…Most of the published work addressing the influence of h examines directly its influence on the failure loads, either static [28] or fatigue [29] and, in general, increasing h has shown to improve the strength. Some studies associated this behaviour to the reduction of peel and shear peak stress at the overlap edges of bonded structures [30]. This actually occurs, but other phenomena are also on the basis of these differences in strength.…”

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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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

View full text Add to dashboard Cite

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“…These values specify the mode I and II TSLs for input into the proceeding FEM simulations and strength predictions. Since it is known that the cohesive properties of adhesives are highly dependent on thickness ( h ) [44], It should be mentioned that the parameters reported in Table 3 are only valid for a value of h = 0.2 mm. It should be noted that since the tensile lap-shear test is dominated by mode II failure, the restriction of lateral contraction [49] was not considered important in this study and the stiffness of the CZM was taken as the elastic modulus of the adhesive, E.…”

Section: Resultsmentioning

confidence: 99%

“…CZMs are used to simulate elastic loading, damage initiation and crack growth due local failure within a material [25]. They are based on the relationship between stresses and relative displacements connecting paired nodes of adhesive elements, to model elastic behaviour up to peak strength and subsequent softening of the material to failure [44]. In this work, a triangular shaped TSL was used to define this relationship between stresses and relative displacements of the CZM, see Figure 4, and assumes an initial linear behaviour up to the maximum cohesive strength in tension ( t n 0 ) or in shear ( t s 0 ) at initial displacements ( δ n 0 , δ s 0 ), followed by linear degradation to final displacements ( δ n f , δ s f ).…”

Section: Numerical Analysismentioning

confidence: 99%

A Numerical and Experimental Study of Adhesively-Bonded Polyethylene Pipelines

Guilpin

Franciere

Barton³

et al. 2019

Polymers

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Adhesive bonding of polyethylene gas pipelines is receiving increasing attention as a replacement for traditional electrofusion welding due to its potential to produce rapid and low-cost joints with structural integrity and pressure tight sealing. In this paper a mode-dependent cohesive zone model for the simulation of adhesively bonded medium density polyethylene (MDPE) pipeline joints is directly determined by following three consecutive steps. Firstly, the bulk stress-strain response of the MDPE adherend was obtained via tensile testing to provide a multi-linear numerical approximation to simulate the plastic deformation of the material. Secondly, the mechanical responses of double cantilever beam and end-notched flexure test specimens were utilised for the direct extraction of the energy release rate and cohesive strength of the adhesive in failure mode I and II. Finally, these material properties were used as inputs to develop a finite element model using a cohesive zone model with triangular shape traction separation law. The developed model was successfully validated against experimental tensile lap-shear test results and was able to accurately predict the strength of adhesively-bonded MPDE pipeline joints with a maximum variation of <3%.

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“…Thermoset resins were used for binding the faces and core of the sandwich beam. Cohesive Zone Modelling (CZM) was discussed [7] which deals with the non-linear region afore the crack-tip zone, consequent to micro-cracking or plasticity. CZM, when compared to Linear Elastic Fracture Mechanics (LEFM) proved to be advantageous in the numerical study because of the drawback of LEFM that assumes at first the material to be isotropic and linearly elastic, and consequently not allowing the characterization of the entire fracture process.…”

Section: Introductionmentioning

confidence: 99%

Study of Modal Behaviour of Sandwich Structure with Various Core Materials - An Analytical Approach

Gupta¹,

Chakraborti²,

Bhowmik³

2020

RCMA

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The present study comprises of different types of cored sandwich structures with different core geometries. A combination of materials of skins and cores were considered to investigate the free vibrational or modal behaviour on the core materials and geometries for the structure for illuminating the vibrational aspects for failures. Subsequently, the deformation for sandwich structures with various core geometries and materials was also studied. The objective of the article is to provide an essence of vibrational performance study of aluminium alloy for both skins, and the results were compared among core materials unlike materially configured sandwich structures of honeycomb core. Simulations of mode shapes were obtained using the free vibrational constraints. From this study, it was obtained that, two types of core geometries strictly imply that there is obvious effect of shape of core in sandwich beam vibrational characteristics of structure, as in the study. Lastly, the results obtained by using honeycomb core geometry of certain material was compared to regular rectangular geometrized core and found to have better results in terms of natural frequencies and maximum deformation of the later. Thus, findings may serve as a case for application of similar structures in engineering applications.

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Numerical and Experimental Analysis of Balanced and Unbalanced Adhesive Single-Lap Joints between Aluminium Adherends

Cited by 33 publications

References 30 publications

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

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

A Numerical and Experimental Study of Adhesively-Bonded Polyethylene Pipelines

Study of Modal Behaviour of Sandwich Structure with Various Core Materials - An Analytical Approach

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