Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus

Benzeggagh, M.L.; Kenane, M.

doi:10.1016/0266-3538(96)00005-x

Cited by 2,286 publications

(877 citation statements)

References 3 publications

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“…However, Camanho et al [24] have shown that the expression proposed by Benzeggagh and Kenane [36] for the critical energy release rate for a mixedmode ratio is more accurate for epoxy and PEEK composites. The expression proposed by Benzeggagh and Kenane for the critical energy release rate G c is:…”

Section: Propagation Criterionmentioning

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: Propagation Criterionmentioning

confidence: 99%

“…The delamination onset criterion stems from the expression of the critical energy release rate for delamination propagation under mixed-mode loading proposed by Benzeggagh and Kenane [36]. The model is implemented in the implicit finite element code ABAQUS [54] by means of a user-written decohesion element.…”

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

“…Failure initiation was governed by a quadratic stress criterion, (1) where τ i (i = 1,2,3) are the stresses in the in-plane directions (1,2) and normal direction (3) respectively, and are the corresponding maximum stresses associated with each direction, . Delamination was propagated using a mixed-mode relationship proposed by Benzeggagh and Kenane (B-K propagation criterion) [11], (2) where G c is the mixed-mode fracture toughness, B is the local mixed-mode ratio defined as B = G shear /(G I + G shear ). As mode III is not considered, G shear = G II .…”

Section: Interlaminar Damage Modelmentioning

confidence: 99%

“…(11) (12) (13) where γ ij is the current shear strain, is the final failure shear strain, and is the inelastic strain at the onset of fracture. In order to account for irreversibility, the damage variable, as a function of analysis time, t, is defined as (14) As damage is triggered when the shear strength, , is reached, the response follows a negative tangent stiffness resulting in the softening of the secant shear modulus, with increasing applied strain, to (1 -d mat ) , shown by path 3 in Figure 4.…”

Section: Damage Evolutionmentioning

confidence: 99%

Predicting Impact Damage, Residual Strength and Crashworthiness of Composite Structures

Falzon

Tan

2016

SAE Int. J. Mater. Manf.

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The development of the latest generation of wide-body carbon-fibre composite passenger aircraft has heralded a new era in the utilisation of these materials. The premise of superior specific strength and stiffness, corrosion and fatigue resistance, is tempered by high development costs, slow production rates and lengthy and expensive certification programmes. Substantial effort is currently being directed towards the development of new modelling and simulation tools, at all levels of the development cycle, to mitigate these shortcomings. One of the primary challenges is to reduce the extent of physical testing, in the certification process, by adopting a 'certification by simulation' approach. In essence, this aspirational objective requires the ability to reliably predict the evolution and progression of damage in composites. The aerospace industry has been at the forefront of developing advanced composites modelling tools. As the automotive industry transitions towards the increased use of composites in mass-produced vehicles, similar challenges in the modelling of composites will need to be addressed, particularly in the reliable prediction of crashworthiness. While thermoset composites have dominated the aerospace industry, thermoplastics composites are likely to emerge as the preferred solution for meeting the high-volume production demands of passenger road vehicles. This keynote paper outlines recent progress and current challenges in the development of finite-element-based predictive modelling tools for capturing impact damage, residual strength and energy absorption capacity of thermoset and thermoplastic composites for crashworthiness assessments.

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“…With 3D elements, the adhesive layer can be defined as isotropic material. The problem can then be solved in the elastic strain range using Hooke's law and cohesive surface contact [5], or with the aid of 3D cohesive elements [6,7]. These elements can be related to Griffith's theory of fracture [8].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of metal-to-composite bonded joints with various adhesive layer configurations using finite element method

2017

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Original scientific paper The purpose of this paper was to optimise several bonded joints using the optimisation cycle implemented in finite element analysis (FEA) software. These bonded joints were compared to each other based on different geometry and strength obtained by the optimisation cycle. For these bonded joints the bonded surfaces had various shapes and parameters. The impact of the length, thickness and cross-section angle of the adhesive layer on the resulting stress level and the final relative twist angle between a composite tube and a steel flange have been investigated. Specimens with cylindrical bonding surface were used as the reference shape, which influenced the calculated strength of the specimens. The shape of the bonded joint is in accordance with the bonded joints used for transmitting torque to machine tool spindles in machine tool design and results of this research will be used for similar applications. Keywords: bonded joints; composite material; finite element analysis; metal-to-composite joints; optimisation cycleUsporedba između veznih spojeva od metala i kompozita povezanih različitim konfiguracijama veznog spoja primjenom metode konačnih elemenata Izvorni znanstveni članak Cilj ovoga rada bio je optimizirati nekoliko veznih spojeva primjenom ciklusa optimizacije implementiranog u softveru analize konačnih elemenata. Ti spojevi su međusobno uspoređeni na osnovu različite geometrije i čvrstoče postignute ciklusom optimizacije. Za tako povezane spojeve vezne su se površine uspoređivale na osnovu različite geometrije i čvrtoće postignute ciklusom optimizacije. Kod tih spojeva vezne su površine bile različitih oblika i parametara. Ispitivao se utjecaj dužine, debljine i kuta poprečnog presjeka adhezijskog sloja na rezultirajuću razinu naprezanja i završni relativni kut uvijanja između cijevi od kompozita i prirubnice od čelika. Kao referentni oblik korišteni su uzorci s cilindričnom veznom površinom što je utjecalo na proračunsku čvrstoću uzoraka. Oblik veznog spoja je u skladu s veznim spojevima rabljenim za prenošenje zakretnog momenta vretenima alatnog stroja kod projekta alatnog stroja pa će se rezultati ovoga istraživanja primijeniti za slične aplikacije.Ključne riječi: analiza konačnih elemenata; ciklus optimizacije; kompozitni materijal; spojevi metala i kompozita; vezni spojevi

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Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus

Cited by 2,286 publications

References 3 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

Predicting Impact Damage, Residual Strength and Crashworthiness of Composite Structures

Optimisation of metal-to-composite bonded joints with various adhesive layer configurations using finite element method

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