A study on the influence of cohesive zone interface element strength parameters on mixed mode behaviour

Harper, Paul W; Sun, Lu; Hallett, Stephen R.

doi:10.1016/j.compositesa.2011.12.016

Cited by 81 publications

(54 citation statements)

References 22 publications

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“…The first extension to a compression regionσ c < 0 was proposed by García et al (2015), and coincides with the proposal made by Lemaitre and Desmorat (2005) which corresponds to p = 2, while the second extension can be found in Harper et al (2012), again corresponding for p = 2. The dimensionless fracture energy is defined bŷ…”

Section: Review Of Interface Failure Criteria In Mixed Modesupporting

confidence: 82%

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A linear elastic-brittle interface model: application for the onset and propagation of a fibre-matrix interface crack under biaxial transverse loads

et al. 2015

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A new linear elastic and perfectly brittle interface model for mixed mode is presented and analysed. In this model, the interface is represented by a continuous distribution of springs which simulates the presence of a thin elastic layer. The constitutive law for the continuous distribution of normal and tangential initially-linear-elastic springs takes into account possible frictionless elastic contact between adherents once a portion of the interface is broken. A perfectly brittle failure criterion is employed for the springs, which enables the study of crack onset and propagation. This interface failure criterion takes into account the variation of the interface fracture toughness with the fracture mode mixity. A unified way to represent several phenomenological both energy and stress based failure criteria is introduced. A proof relating the energy release rate and tractions at an interface point (not necessarily a crack tip point) is introduced for this interface model by adapting Irwin's crack closure technique for the first time. The main advantages of the present interface model are its simplicity, robustness and computational efficiency, even in the presence of snap-back and snap-through instabilities, when the so-called sequentially linear (elastic) analysis is applied. This model is applied here in order to study crack onset and propagation at the fibre-matrix interface in a composite under tensile/compressive remote biaxial transverse loads. Firstly, this model is used to obtain analytical predictions about interface crack onset, while investigating a single fibre embedded in a matrix which is subjected to uniform remote transverse loads. Then, numerical results provided by a 2D boundary element analysis show that a fibre-matrix interface failure is initiated by the onset of a finite debond in the neighbourhood of the interface point where the failure criterion is first reached (under increasing proportional load); this debond further propagates along the interface in mixed mode or even, in some configurations, with the crack tip under compression. The analytical predictions of the debond onset position and associated critical load are used for several parametric studies of the influence of load biaxiality, fracture-mode sensitivity and brittleness number, and for checking the computational procedure implemented.

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Section: Review Of Interface Failure Criteria In Mixed Modesupporting

confidence: 82%

“…The particular case q = 1 was suggested by Wang and Suo (1990) and used by Harper et al (2012). Pinho et al (2006) obtained q = 1.21 by fitting some experimental data.…”

Section: Review Of Interface Failure Criteria In Mixed Modementioning

confidence: 99%

A linear elastic-brittle interface model: application for the onset and propagation of a fibre-matrix interface crack under biaxial transverse loads

et al. 2015

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“…The material properties of the specimens are listed in Table 2. CZM results are very sensitive to the element size and in order to obtain accurate results very fine mesh must be utilized [26][27][28][31][32][33]. Previous studies [26][27][28] indicated that for accurate simulation, at least two elements must be inserted in the cohesive zone length ahead the crack tip.…”

Section: Crack Growth Prediction Using Czmmentioning

confidence: 99%

“…Some studies have also been conducted to numerically investigate the delamination damage in laminated composites [12,[26][27][28]. The techniques utilized for the numerical simulation can be divided into two groups.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of delamination growth in laminated composites using acoustic emission and Cohesive Zone Modeling techniques

Saeedifar

Fotouhi

Najafabadi

et al. 2015

Composite Structures

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Overcoming the cohesive zone limit in composites delamination: modeling with slender structural elements and higher‐order adaptive integration

Russo

Chen

2020

Numerical Meth Engineering

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Summary Cohesive element (CE) is a well‐established finite element for fracture, widely used for the modeling of delamination in composites. However, an extremely fine mesh is usually needed to resolve the cohesive zone, making CE‐based delamination analysis computationally prohibitive for applications beyond the scale of lab coupons. In this work, a new CE‐based method of modeling delamination in composites is proposed to overcome this cohesive zone limit on the mesh density. The proposed method makes use of slender structural elements for the plies, a compatible formulation with adaptive higher‐order integration for the CEs, and the corotational formulation for geometrically nonlinear analysis. The proposed method is verified and validated on the classical benchmark problems of Mode I, II, mixed‐mode delamination, a buckling‐induced delamination problem and a double‐delamination problem. The results show that elements much larger than the cohesive zone length can be used while retaining accuracy.

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A study on the influence of cohesive zone interface element strength parameters on mixed mode behaviour

Cited by 81 publications

References 22 publications

A linear elastic-brittle interface model: application for the onset and propagation of a fibre-matrix interface crack under biaxial transverse loads

A linear elastic-brittle interface model: application for the onset and propagation of a fibre-matrix interface crack under biaxial transverse loads

Prediction of delamination growth in laminated composites using acoustic emission and Cohesive Zone Modeling techniques

Overcoming the cohesive zone limit in composites delamination: modeling with slender structural elements and higher‐order adaptive integration

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