Numerical analysis of the energy contributions in peel tests: A steady-state multilevel finite element approach

Martiny, Philippe; Lani, Frédéric; Kinloch, A. J.; Pardoen, Thomas

doi:10.1016/j.ijadhadh.2007.06.005

Cited by 46 publications

(27 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It partitions G IC into a local intrinsic contribution G 0 coming from the FPZ and a non--local contribution G P [8,28]. In [8] and [28], G 0 is kept fixed and hence the variation in G IC with BGT is solely attributed to the variation in G P with BGT. A constant G 0 would suggest that the fracture process zone and fracture features are uniform and do not change with BGT.…”

Section: Discussion On G Ic Dependence On the Bond Gap Thicknessmentioning

confidence: 99%

“…Ideally, if this thickness happens to coincide with the size of the FPZ then a correct G 0 should be obtained. In [8] and [28], the cohesive strength was taken to be greater than three times the adhesive yield stress and G 0 was extracted from numerical steady--state simulations of a set of wedge peel tests for two different adhesives [19]. The validity of this approach was argued on the basis of reasonably good comparison with compact tension and TDCB results, and good prediction of bond gap dependence of G IC in wedge peel tests.…”

Section: Discussion On G Ic Dependence On the Bond Gap Thicknessmentioning

confidence: 99%

“…The authors explained this dependency in terms of constraint effects on G P , while G 0 was assumed to be independent of constraint and BGT. A similar energy partitioning approach was reported in [28], where a steady--state FE model was used to study energy contributions in peel tests. It was found that the values of G Ic were not significantly dependent upon the details of the peel test configuration and that numerical predictions agreed well with reported analytical results from various elastic--plastic peel tests.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Effects of bond gap thickness on the fracture of nano-toughened epoxy adhesive joints

Cooper

Ivanković

Karač

et al. 2012

Polymer

View full text Add to dashboard Cite

Publication information Polymer, 53 (24): 5540-5553Publisher Elsevier Item record/more information http://hdl.handle.net/10197/5950 Publisher's statementThis is the author's version of a work that was accepted for publication in Polymer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer (53, 24, (2012)) DOI: http://dx.doi/org/10.1016/j.polymer.2012.09.049Publisher's version (DOI) http://dx.doi.org/10.1016/j.polymer.2012.09.049 NotesOther RMSIDs: 316516744Some rights reserved. For more information, please see the item record link above. Bosnia and Herzegovina AbstractThe current work is a combined experimental--numerical study of the fracture behaviour of a nano--toughened, structural epoxy adhesive. The mode I fracture toughness of the adhesive is measured using tapered double--cantilever beam ( IntroductionThe accurate and efficient determination of the fracture toughness and the associated fracture mechanisms of a structural adhesive are of fundamental importance to adhesive manufacturers and end users alike. The ability to predict the behaviour of such joints can lead to better designs, increased performance, reduced costs and enhanced safety. Better understanding of the structure--property relationship will ultimately lead towards improved adhesives with tailored properties. However, the behaviour of joints in real structures is difficult to predict since their behaviour, including the failure mechanisms, are complex to measure and model. The testing of prototypes and trial structures is costly and time--consuming. Consequently, there has been a growing motivation for the development of theoretical models for predicting the damage and failure of adhesive joints. These models require geometry independent material parameters, which are usually obtained from tests with simpler geometries and subsequently applied in the analysis of more complexgeometries.An important parameter in adhesive joint design is the bond gap thickness (BGT) which needs to be accurately controlled in order to obtain a consistent and reliable joint strength. In the current work, the mode I fracture behaviour of a nano--toughened, structural epoxy adhesive was examined using low--rate TDCB tests with various bond gap thicknesses. The Application of the CZM to adhesive jointsCohesive zone models are widely used to model the fracture of adhesive joints. In general, the substrates are modelled as elastic--plastic continua while two main approaches are adopted for the modelling of the adhesive layer: i) CZM is used to represent the entire adhesive layer, ii) the adhesive layer is modelled as a continuum while CZM is used to describe the local fracture process. A number of authors have used a single row of cohesive zone elements to represent the adhesive layer, e.g. ...

show abstract

Section: Discussion On G Ic Dependence On the Bond Gap Thicknessmentioning

confidence: 99%

Section: Discussion On G Ic Dependence On the Bond Gap Thicknessmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Effects of bond gap thickness on the fracture of nano-toughened epoxy adhesive joints

Cooper

Ivanković

Karač

et al. 2012

Polymer

View full text Add to dashboard Cite

show abstract

“…The idea behind the model that will be developed was first suggested by Needleman (1987) in the context of inclusion debonding in heterogeneous materials, and has been applied recently to cohesive failure in adhesive joints (Blackman et al, 2003b;Cooper et al, 2009;Martiny et al, 2008;Pardoen et al, 2005;Salomonsson and Andersson, 2008;Tvergaard and Hutchinson, 1994). It consists in following a 'top-down approach' to fracture (Hutchinson and Evans, 2000): that is, both cohesive zone elements and continuum elements are used to represent the different phenomena taking place at different length scales in the adhesive as it fractures.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, the model relies on a single set of material parameters, like other types of model in the literature (e.g. Chai and Chiang, 1998;Hadavinia et al, 2006), to reproduce accurately the failure of the adhesive for different types of test specimen and over a wide range of geometrical configurations (Martiny et al, 2008). This is in contrast to numerous solutions that can be found in the literature (e.g.…”

Section: Introductionmentioning

confidence: 99%

A multiscale parametric study of mode I fracture in metal-to-metal low-toughness adhesive joints

et al. 2012

Self Cite

View full text Add to dashboard Cite

The failure of adhesively-bonded joints, consisting of metallic adherends and epoxy-based structural adhesive with a relatively low toughness ∼200 J/m², has been studied. The failure was via quasistatic mode I, steady-state crack propagation and has been modelled numerically. The model implements a 'top-down approach' to fracture using a dedicated steady-state, finite-element formulation. The damage mechanisms responsible for fracture are condensed onto a row of cohesive zone elements with zero thickness, and the responses of the bulk adhesive and of the adherends are represented by continuum elements spanning the full geometry of the joint. The material parameters employed in the model are first quantitatively identified for the particular epoxy adhesive of interest, and their validity is verified by comparison with experimental results. The model is then used to conduct a detailed study on the effects of (a) large variations in the geometrical configuration of the different types of specimens and (b) the adherend stiffness on the predicted value of the adhesive fracture energy, . These numerical modelling results reveal that the adhesive fracture energy is a strong nonlinear function of the thickness of the adhesive layer, the other variables being of secondary importance in influencing the value of providing the adhesive does not contribute significantly to the bending stiffness of the joint. These results which fully agree with experimental observations are explained in detail by identifying, and quantifying, the different sources of energy dissipation in the bulk adhesive contributing to the value of . These sources are the locked-in elastic energy, crack tip plasticity, reverse plastic loading and plastic shear deformation at the adhesive/adherend interface. Further, the magnitudes of these sources of energy dissipation are correlated to the degree of constraint at the crack tip, which is quantified by considering the opening angle of the cohesive zone at the crack tip.

show abstract

Controlling Adherence

Pardoen

Dezellus

Braccini

2012

Mechanics of Solid Interfaces

View full text Add to dashboard Cite

Numerical analysis of the energy contributions in peel tests: A steady-state multilevel finite element approach

Cited by 46 publications

References 18 publications

Effects of bond gap thickness on the fracture of nano-toughened epoxy adhesive joints

Effects of bond gap thickness on the fracture of nano-toughened epoxy adhesive joints

A multiscale parametric study of mode I fracture in metal-to-metal low-toughness adhesive joints

Controlling Adherence

Contact Info

Product

Resources

About