Progressive Delamination Using Interface Elements

Mi, Y.; Crisfield, M. A.; Davies, G. A. O.; Hellweg, H.-B.

doi:10.1177/002199839803201401

Cited by 541 publications

(345 citation statements)

References 14 publications

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“…The law proposed here is a bilinear relation between the tractions and the displacement jumps [21], [24], [45]. The bilinear law is the most commonly used cohesive law due to its simplicity.…”

Section: Damage Evolution Lawmentioning

confidence: 99%

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A damage model for the simulation of delamination in advanced composites under variable-mode loading

Turón

Camanho

Costa

et al. 2006

Mechanics of Materials

781

438

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A thermodynamically consistent damage model is proposed for the simulation of progressive delamination in composite materials under variable-mode ratio. The model is formulated in the context of Damage Mechanics. A novel constitutive equation is developed to model the initiation and propagation of delamination. A delamination initiation criterion is proposed to assure that the formulation can account for changes in the loading mode in a thermodynamically consistent way.The formulation accounts for crack closure effects to avoid interfacial penetration of two adjacent layers after complete decohesion. The model is implemented in a finite element formulation, and the numerical predictions are compared with experimental results obtained in both composite test specimens and structural components.

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Section: Damage Evolution Lawmentioning

confidence: 99%

“…There are some models in the literature that can be used under constant mixed-mode conditions [21], [23]- [24], [30]- [35].…”

Section: Introductionmentioning

confidence: 99%

A damage model for the simulation of delamination in advanced composites under variable-mode loading

Turón

Camanho

Costa

et al. 2006

Mechanics of Materials

781

438

View full text Add to dashboard Cite

show abstract

“…For example, Mi et al (1998) developed a method incorporating interface elements within the non-linear finite element method (FEM) and successfully simulated the mixed mode delamination of fiber-composites. Parmigiani and Thouless (2006) studied crack deflection and crack penetration using a cohesive model that incorporated both strength and fracture toughness simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking

Zeng

Wei

2017

Journal of the Mechanics and Physics of Solids

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a b s t r a c tDriven by the rapid progress in exploiting unconventional energy resources such as shale gas, there is growing interest in hydraulic fracture of brittle yet heterogeneous shales. In particular, how hydraulic cracks interact with natural weak zones in sedimentary rocks to form permeable cracking networks is of significance in engineering practice. Such a process is typically influenced by crack deflection, material anisotropy, crack-surface friction, crustal stresses, and so on. In this work, we extend the He-Hutchinson theory (He and Hutchinson, 1989) to give the closed-form formulae of the strain energy release rate of a hydraulic crack with arbitrary angles with respect to the crustal stress. The critical conditions in which the hydraulic crack deflects into weak interfaces and exhibits a dependence on crack-surface friction and crustal stress anisotropy are given in explicit formulae. We reveal analytically that, with increasing pressure, hydraulic fracture in shales may sequentially undergo friction locking, mode II fracture, and mixed mode fracture. Mode II fracture dominates the hydraulic fracturing process and the impinging angle between the hydraulic crack and the weak interface is the determining factor that accounts for crack deflection; the lower friction coefficient between cracked planes and the greater crustal stress difference favor hydraulic fracturing. In addition to shale fracking, the analytical solution of crack deflection could be used in failure analysis of other brittle media.

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“…It is also well known that explicit calculations with CZM show spurious oscillations of computed forces leading to undesirable results [4,5]. This problem is caused by an instability which occurs just after the stress reaches the peak strength of the interface.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of mode I delamination specimens by means of implicit and explicit solvers

et al. 2012

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The simulation of delamination using the Finite Element Method (FEM) is a useful tool to analyse fracture mechanics. In this paper, simulations are performed by means of two different fracture mechanics models: Two Step Extension (TSEM) and Cohesive Zone (CZM) methods, using implicit and explicit solvers, respectively. TSEM is an efficient method to determine the energy release rate components G Ic , G IIc and G IIIc using the experimental critical load (P c ) as input, while CZM is the most widely used method to predict crack propagation (P c ) using the critical energy release rate as input. The two methods were compared in terms of convergence performance and accuracy to represent the material behaviour and in order to investigate their validity to predict mode I interlaminar fracture failure in unidirectional AS4/8552 carbon fibre composite laminates. The influence of increasing the loading speed and using mass scaling was studied in order to decrease computing time in CZ models. Finally, numerical simulations were compared with experimental results performed by means of Double Cantilever Beam specimens (DCB). Results showed a good agreement between both FEM models and experimental results.

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Progressive Delamination Using Interface Elements

Cited by 541 publications

References 14 publications

A damage model for the simulation of delamination in advanced composites under variable-mode loading

A damage model for the simulation of delamination in advanced composites under variable-mode loading

Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking

Finite element modelling of mode I delamination specimens by means of implicit and explicit solvers

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