Artificial compliance inherent to the intrinsic cohesive zone models: criteria and application to planar meshes

Blal, Nawfal; Daridon, Loïc; Monerie, Yann; Pagano, Stéphane

doi:10.1007/s10704-012-9734-y

Cited by 46 publications

(21 citation statements)

References 18 publications

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“…In particular, κ is set equal to 200 in this work. This value is coherent with what is suggested in the recent literature [ 52 , 57 ], and perfectly in line with an imposed reduction in the overall stiffness of about 1%, according to the micromechanical approach proposed by some of the authors to obtain invisible cohesive interfaces [ 51 ].…”

Section: Diffuse Cohesive Interface Modeling Approach For Nano-enhsupporting

confidence: 91%

Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach

et al. 2020

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Recent progresses in nanotechnology have clearly shown that the incorporation of nanomaterials within concrete elements leads to a sensible increase in strength and toughness, especially if used in combination with randomly distributed short fiber reinforcements, as for ultra high-performance fiber-reinforced concrete (UHPFRC). Current damage models often are not able to accurately predict the development of diffuse micro/macro-crack patterns which are typical for such concrete structures. In this work, a diffuse cohesive interface approach is proposed to predict the structural response of UHPFRC structures enhanced with embedded nanomaterials. According to this approach, all the internal mesh boundaries are regarded as potential crack segments, modeled as cohesive interfaces equipped with a mixed-mode traction-separation law suitably calibrated to account for the toughening effect of nano-reinforcements. The proposed fracture model has been firstly validated by comparing the failure simulation results of UHPFRC specimens containing different fractions of graphite nanoplatelets with the available experimental data. Subsequently, such a model, combined with an embedded truss model to simulate the concrete/steel rebars interaction, has been used for predicting the load-carrying capacity of steel bar-reinforced UHPFRC elements enhanced with nanoplatelets. The numerical outcomes have shown the reliability of the proposed model, also highlighting the role of the nano-reinforcement in the crack width control.

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Section: Diffuse Cohesive Interface Modeling Approach For Nano-enhsupporting

confidence: 91%

Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach

et al. 2020

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“…According to our results, for VAlON the best fit to the experimental measurements is obtained by setting t 0 = 6 GPa and λ 0 → 0.0, such that λ 0 is very small, and the elastic response of the finite elements in the cantilever beam is not affected by the introduction of CZ elements [34].…”

Section: Finite Element Simulationmentioning

confidence: 69%

From quantum to continuum mechanics: studying the fracture toughness of transition metal nitrides and oxynitrides

Gibson

Rezaei

Rueß

et al. 2017

Materials Research Letters

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We show here, based on VAlN, TiAlN and the related oxynitrides, that the (brittle) fracture and elastic properties may be consistently modelled from quantum-to continuum mechanics using micromechanical testing to link both scales. The measured elastic moduli match closely with those predicted by density functional theory calculations. Good agreement was also observed between the microcantilever bending experiments and cohesive-zone-finite element modelling. These scale-bridging data serve as a baseline for future improvements of the fracture toughness of these coating systems based on microstructure and coating architecture optimization. IMPACT STATEMENTWe link ab initio calculations with finite element modelling using micro-mechanical testing to consistently model the elastic and fracture behaviour of transition metal nitrides and oxynitrides. ARTICLE HISTORY

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“…Among the different measures, stiffness-based damage is quite sensitive to the value of initial stiffness, i.e., the higher K 0 , the steeper the damage evolution. In [40] a study was performed in order to define bound values of the initial stiffness for a cohesive zone model. The sensitivity of the damage evolution with respect to the initial stiffness is quite clear looking at the graphical representation of Equation (1) in Figure 2 for increasing values of K 0 .…”

Section: Introductionmentioning

confidence: 99%

Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation

Pirondi

Moroni

2019

Materials

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The cohesive zone model (CZM) has found wide acceptance as a tool for the simulation of delamination in composites and debonding in bonded joints and various implementations of the cohesive zone model dedicated to fatigue problems have been proposed in the past decade. In previous works, the authors have developed a model based on cohesive zone to simulate the propagation of fatigue defects where damage acts on cohesive stiffness, with an initial (undamaged) stiffness representative of that of the entire thickness of an adhesive layer. In the case of a stiffness that is order of magnitude higher than the previous one (for instance, in the simulation of the ply-to-ply interface in composites), the model prediction becomes inaccurate. In this work, a new formulation of the model that overcomes this limitation is developed. Finite element simulations have been conducted on a mode I, constant bending (constant G)-loaded double cantilever beam (DCB) joint to assess the response of the new model with respect to the original one for varying initial stiffness K0 and cohesive strength σ0. The results showed that the modified model is robust with respect to changes of two orders of magnitude in initial stiffness and of a factor of two in σ0.

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Artificial compliance inherent to the intrinsic cohesive zone models: criteria and application to planar meshes

Cited by 46 publications

References 18 publications

Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach

Failure Analysis of Ultra High-Performance Fiber-Reinforced Concrete Structures Enhanced with Nanomaterials by Using a Diffuse Cohesive Interface Approach

From quantum to continuum mechanics: studying the fracture toughness of transition metal nitrides and oxynitrides

Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation

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