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Showing 1 to 20 of 74 for “"Cohesive Zone"”.
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Cohesive Zone Modelling of Fiber–Matrix Interface in Composite Materials
… behaviour. The interface is represented using a Cohesive Zone Model (CZM), enabling accurate computation of interface properties. The model is developed using prior experimental nanoindentation load-displacement curves and demonstrates strong correlation with the same, confirming its validity as …
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Cohesive zone modeling of fracture of sustainable and functionally graded concrete
… is developed; which incorporates a variety of cohesive zone models (CZMs) into an implicit, nonlinear finite element scheme. Intrinsic cohesive zone elements, with traction-separation relationships defined along the crack surface, are utilized to simulate mode I fracture of the slabs. Based on …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
… of cracks without specifying an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model known in the fracture mechanics literature as the Dugdale-Barenblatt model, is adopted to represent the degradation of the material ahead of the crack tip. This model unifies …
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Fracture of Asphalt Concrete: A Cohesive Zone Modeling Approach Considering Viscoelastic Effects
… occurring in a relatively large fracture process zone, a cohesive zone model (CZM) is employed. Finite element implementation of the CZM is accomplished via user subroutines that can be used in conjunction with general-purpose software. The bulk properties (e.g. relaxation modulus) and fracture …
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Potential-Based Fracture Mechanics Using Cohesive Zone and Virtual Internal Bond Modeling
… surfaces is a fundamental issue in mixed-mode cohesive fracture simulations. A generalized potential-based constitutive theory of mixed-mode fracture is proposed in conjunction with physical quantities such as fracture energy, cohesive strength and shape of cohesive interactions. The …
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Simulation of delamination in composite materials under static and fatigue loading by cohesive zone models
… work presents an examination of the potential of cohesive interface elements for the prediction of delamination propagation under quasi-static mode I, mode II and mixed mode (I and II) loading, by a comparison between experimental tests and parametric analyses in order to evaluate the sensitivity …
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Development of an enhanced microstructure–level machining model for carbon nanotube reinforced polymer composites using cohesive zone interface
… The CNT–polymer interface is represented by the cohesive zone model (CZM) that is characterized by two parameters, viz., interfacial strength and interfacial fracture energy. The CZM parameters for the CNT–polymer interface are obtained through nanoindentation tests, and then implemented in the …
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Reduction and softening/melting behaviour of olivine pellet in the experimental blast furnace
… reduction rate and the softening behavior in the cohesive zone of blast furnace. The carburization characteristics of reduced iron were also investigated by examining olivine pellet and coke samples excavated and probed from an experimental blast furnace as well as the experimental investigations …
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The Ductile to Brittle Transition in Polycarbonate
… bulk constitutive model is used with a new cohesive zone model that is stress state and rate-dependent in order to simulate the ductile to brittle failure transition in polycarbonate. The cohesive zone model is motivated by experimental evidence that two different critical energies per unit …
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Extrinsic Cohesive Modeling of Dynamic Fracture and Microbranching Instability Using a Topological Data Structure
… in a variety of materials by incorporating a Cohesive Zone Model (CZM) into the finite clement scheme, The CZM failure criterion uses both a finite cohesive strength and work to fracture in the material description. Based on crack initiation criteria, CZMs can be categorized into two groups, …
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Cohesive Modeling of Dynamic Fracture: Rate Dependence and Intersonic Crack Motion
… Results show that exclusive shear damage in the cohesive zone is responsible for intersonic crack propagation even though the external load comprises of both shear and tensile components. The situation is very different in the subsonic regime, where crack motion is a result of combined shear and …
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A Multiscale Method for Simulating Fracture in Polycrystalline Metals
… dynamics simulation and are mapped into cohesive zone models for continuum modeling within a finite element framework. Fracture along grain boundaries typically exhibit a dependence of crack tip processes (i.e. void nucleation in brittle cleavage or dislocation emission in ductile …
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The softening and melting of blast furnace burden materials.
The conditions prevailing in the cohesive zone of the blast furnace have been determined from published data and applied in a study of burden materials on an experimental scale. The mechanism of softening and melting of burden materials has been evaluated and it was found that two opposing …
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Analysing aspects of the performance of an ironblast furnace
… packed bed. This enabled the prediction of the cohesive zone geometry, together with the active coke and stack, thus providing an important step for a successful analysis. The availability of multi-phase codes to solve such a system was limited and those existing being inadequate to represent …
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Emergence of Delamination Fractures around Casing and Its Stability
… or simple nonlinear mechanical interfaces. Cohesive zone method (CZM) with BK-form bilinear traction separation law can be a good candidate to reproduce the complicated failure behavior around the casing. Then fracture critical energy, cohesive strength, and the deformability can be derived …
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Shear fatigue of adhesively bonded frictional interfaces in high-strength steel
… where the total strength is a combination of cohesive and frictional forces. In this thesis, a new experimental method is introduced for characterising the idealised bonded and clamped interface under shear fatigue loading. The experimental method is based on the modified napkin ring specimen, …
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Packing of particles during softening and melting process.
… the form of sinter, pellet, and lump ore in the cohesive zone of an ironmaking blast furnace is an important phenomenon that has a significant effect on gas permeability and consequently blast furnace production efficiency. The macroscopic softening deformation behavior of the bed and the …
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Simulation of deformation and fracture in very large shell structures
… element method with an interface element-based cohesive zone representation of fracture. This representation of fracture permits arbitrary crack propagation, branching, and merging, without on-the-fly mesh topological changes. Furthermore, in parallel computing, this propagation algorithm is …
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Multiscale Modeling of the Effects of Nanoscale Load Transfer on the Effective Elastic Properties of Carbon Nanotube-Polymer Nanocomposites
… at the functionalized CNT-Epoxy interface. Cohesive zone traction-displacement laws are developed based on the force-separation responses obtained from the MD simulations for both non-functionalied and functionalized CNT-PE/epoxy interfaces. Using the cohesive zone laws, the influence of the …
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