Crack equivalent concept applied to the fracture characterization of bonded joints under pure mode I loading

Moura, M.F.S.F. de; Campilho, R.D.S.G.; Gonçalves, J.P.M.

doi:10.1016/j.compscitech.2008.04.003

Cited by 246 publications

(133 citation statements)

References 15 publications

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“…The mean values of critical fracture energy of maximum point criteria were achieved as G IIIC = 232.5 (J/mm 2 ). In theory, it may seem that the values are representative of fracture initiation; therefore, the measured critical mode-III strain energy release rate should be constant with insert crack lengths if mode-III strain energy value is considered as a natural attribute of adhesive joints whereas fracture toughness of mode-I and mode-II conditions in Pre-crack adhesive joints indicated Stable R-curve behavior so that fracture toughness could be introduced by a constant value [1][2][3][4][5][6][7][8][9][10].…”

Section: Resultsmentioning

confidence: 99%

“…Fracture characterization of bonded joints under pure mode-I has been extensively studied by several authors. Double cantilever beam (DCB) and tapered DCB (TDCB) tests are the most widely used methods for measuring mode-I fracture toughness [1][2][3][4]. Three-point bending of adhesively bonded end notched flexure (ENF) has shown to be the preferred test technique for obtaining mode-II critical strain energy release rate [5][6][7][8][9].…”

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confidence: 99%

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The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Mehrabadi

2014

appl adhes sci

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Evaluation of fracture energy of adhesive joints under mode-III and mixed-mode III/II is a key issue when failure analyses have to be performed. It is thus useful to determine fracture toughness under mode-III and characterization of crack front behavior of bonded joints under mixed-mode III/II loading conditions, which were the overall goal of this paper. For this purpose, edge crack torsion (ECT) and six-point bending plate (6PBP) tests were employed using steel/epoxy adhesive joint. The experimental tests were performed under displacement control and three types of configurations were tested to achieve different mixed-mode ratios. Test results showed considerable linearity before the maximum load point both under pure mode III and mixed-mode III/II; also, failure examination indicated that dominate failure under tearing mode was adhesive/adherend interface, which will be discussed in detail. The experimental tests were numerically simulated and virtual crack closure technique (VCCT) was employed to reproduce behavior of crack front propagation. Both experimental compliance method and finite element analysis proved applicable for the fracture mechanism of adhesive assemblies under mode-III and mixed-mode III/II.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Mehrabadi

2014

appl adhes sci

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“…Since, crack propagation is an energy based prediction, then magnitude J ic should correspond to the steady-state fracture toughness level. Nevertheless, the adhesive material used herein, Araldite 2015, does not have a typical R-curve for Mode I and Mode II, meaning that the initial and steady-state fracture toughness levels cannot be distinguished, as concluded in [37,45].…”

Section: Finite Element Modelingmentioning

confidence: 99%

A 3D ductile constitutive mixed-mode model of cohesive elements for the finite element analysis of adhesive joints

Anyfantis¹,

Tsouvalis²

2013

Journal of Adhesion Science and Technology

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“…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]. This course of action is supported by the typically varying mechanical properties of adhesive layers with t A , diverging also to the adhesive bulk properties [25].…”

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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Crack equivalent concept applied to the fracture characterization of bonded joints under pure mode I loading

Cited by 246 publications

References 15 publications

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

A 3D ductile constitutive mixed-mode model of cohesive elements for the finite element analysis of adhesive joints

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

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