Fracture behaviour of damaged wood beams repaired with an adhesively-bonded composite patch

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

doi:10.1016/j.compositesa.2009.04.007

Cited by 43 publications

(18 citation statements)

References 37 publications

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“…The softening regions of the CZM laws are defined in Abaqus s by specification of the damage variable (dn for tension or ds for shear), as a function of dn-dn elastic behaviour up to tn (tension) or ts (shear) and subsequent stiffness reduction, related to the progressive material degradation up to final failure [37,38]. In this work the triangular, linearexponential and trapezoidal shapes were evaluated (Fig.…”

Section: Czm Implementation In the Fe Analysismentioning

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

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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: Czm Implementation In the Fe Analysismentioning

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

Self Cite

506

193

View full text Add to dashboard Cite

show abstract

“…The joint was meshed by ABA-QUS® CAE meshing algorithms from the user introduced seeding preferences (including bias effects). The mesh was particularly refined at the overlap edges to accurately capture spots of stress concentrations [30,31]. The joints were modelled as two-dimensional, with plane strain solid elements (referenced as CPE8 from the ABAQUS® library).…”

Section: Numerical Analysismentioning

confidence: 99%

Effect of temperature on the shear strength of aluminium single lap bonded joints for high temperature applications

Banea

Silva

Campilho³

2012

Journal of Adhesion Science and Technology

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An experimental and numerical investigation into the shear strength behaviour of adhesive single lap joints (SLJs) was carried out in order to understand the effect of temperature on the joint strength. The adherend material used for the experimental tests was an aluminium alloy in the form of thin sheets, and the adhesive used was a high-strength high temperature epoxy. Tensile tests as a function of temperature were performed and numerical predictions based on the use of a bilinear cohesive damage model were obtained. It is shown that at temperatures below T g , the lap shear strength of SLJs increased, while at temperatures above T g , a drastic drop in the lap shear strength was observed. Comparison between the experimental and numerical maximum loads representing the strength of the joints shows a reasonably good agreement.

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“…Initially, the prediction was performed by theoretical studies as those of Volkersen [6], which had a lot of embedded simplifying assumptions, by T R.D.S.G. Campilho et alii, Frattura ed Integrità Strutturale, 31 (2015) [1][2][3][4][5][6][7][8][9][10][11][12]DOI: 10.3221/IGF-ESIS. 31.01 comparing current stresses with the allowable material strengths.…”

Section: Introductionmentioning

confidence: 99%

Advanced techniques for estimation of the tensile fracture toughness of adhesive joints

Campilho¹,

Silva²

2014

Frattura Ed Integrità Strutturale

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Adhesive bonding has become more efficient in the last few decades due to the adhesives developments, granting higher strength and ductility. 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. When using the Finite Element Method with advanced propagation laws, the tensile (G n c ) and shear (G s c ) fracture toughness of adhesive joints must be determined with accuracy. Several conventional methods to obtain G n c and Gs c exist in the literature, mainly based on Linear Elastic Fracture Mechanics (LEFM). The J-integral technique is accurate to measure these parameters for adhesives with high ductility. In this work, the J-integral is used to obtain G n c by the Double-Cantilever Beam (DCB) test. An optical measurement method is developed for the evaluation of the crack tip opening and adherends rotation at the crack tip during the test, supported by a Matlab ® sub-routine for the automated extraction of these quantities. As output of this work, an optical method that allows an easier and quicker extraction of the parameters to obtain G n c than the available methods is proposed (by the J-integral technique) and some results are presented regarding joints with different geometry and adherend material.

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Fracture behaviour of damaged wood beams repaired with an adhesively-bonded composite patch

Cited by 43 publications

References 37 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

Effect of temperature on the shear strength of aluminium single lap bonded joints for high temperature applications

Advanced techniques for estimation of the tensile fracture toughness of adhesive joints

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