Search results for "cohesive-frictional"

showing 5 items of 5 documents

A three-dimensional cohesive-frictional grain-boundary micromechanical model for intergranular degradation and failure in polycrystalline materials

2013

Abstract In this study, a novel three-dimensional micro-mechanical crystal-level model for the analysis of intergranular degradation and failure in polycrystalline materials is presented. The polycrystalline microstructures are generated as Voronoi tessellations, that are able to retain the main statistical features of polycrystalline aggregates. The formulation is based on a grain-boundary integral representation of the elastic problem for the aggregate crystals, that are modeled as three-dimensional anisotropic elastic domains with random orientation in the three-dimensional space. The boundary integral representation involves only intergranular variables, namely interface displacement di…

Materials scienceCohesive-frictional lawComputational micromechanicComputational MechanicsGeneral Physics and Astronomy02 engineering and technologyIntergranular failureFracture toughnessPolycrystalline material0203 mechanical engineeringUltimate tensile strengthForensic engineeringComposite materialSettore ING-IND/04 - Costruzioni E Strutture AerospazialiBoundary element methodBoundary element method.Coalescence (physics)Mechanical EngineeringMicromechanicsPolycrystalline materials; Computational micromechanics; Intergranular failure; Cohesive-frictional laws; Boundary element method.Intergranular corrosion021001 nanoscience & nanotechnologyComputer Science Applications020303 mechanical engineering & transportsMechanics of MaterialsGrain boundaryCrystallite0210 nano-technologyComputer Methods in Applied Mechanics and Engineering
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Cohesive delamination and frictional contact on joining surface via XFEM

2018

In the present paper, the complex mechanical behaviour of the surfaces joining two different bodies is analysed by a cohesive-frictional interface constitutive model. The kinematical behaviour is characterized by the presence of discontinuous displacement fields, that take place at the internal connecting surfaces, both in the fully cohesive phase and in the delamination one. Generally, in order to catch discontinuous displacement fields, internal connecting surfaces (adhesive layers) are modelled by means of interface elements, which connect, node by node, the meshes of the joined bodies, requiring the mesh to be conforming to the geometry of the single bodies and to the relevant connectin…

Materials scienceDiscretizationConstitutive equationGeometry02 engineering and technology01 natural sciencesdelaminationDiscontinuity (geotechnical engineering)0203 mechanical engineeringlcsh:TA401-492Polygon mesh0101 mathematicsjoined solidsExtended finite element methodCurvilinear coordinatescohesive-frictionalXFEMjoined solidjoined solids; interface; XFEM; cohesive-frictional; delaminationFinite element method010101 applied mathematics020303 mechanical engineering & transportsinterfacelcsh:Materials of engineering and construction. Mechanics of materialsAdhesiveSettore ICAR/08 - Scienza Delle CostruzioniAIMS Materials Science
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A coupled plasticity-damage cohesive-frictional interface for low-cycle fatigue analysis

2022

A novel thermodynamically consistent cohesive-frictional model for the analysis of interface degradation and failure under either monotonic quasi-static loading or cyclic loading in low-cycle fatigue problems is proposed. Starting from the definition of a suitable Helmholtz energy density function, a phenomenological interface model is developed in the framework of plasticity and damage mechanics. In particular, a coupled plasticitydamage activation function is defined and employed together the consistent evolution rules to capture the evolution of damage and plasticity under the action of the external loads. Due to the specific features of such threshold and flow rules, the initiation and …

Mechanics of MaterialsMechanical EngineeringGeneral Materials ScienceSettore ICAR/08 - Scienza Delle CostruzioniSettore ING-IND/04 - Costruzioni E Strutture AerospazialiCondensed Matter PhysicsCohesive zone modelling Low-cycle fatigue analysis Damage Elastic–plastic cohesive-frictional interface Composite bondingCivil and Structural EngineeringInternational Journal of Mechanical Sciences
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Cyclic Delamination Analysis: Experimental and Cohesive-Frictional interface Finite Element Modelling

2011

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineCyclic DelaminationSettore ICAR/08 - Scienza Delle CostruzioniCohesive-Frictional Interface
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A thermodynamically consistent cohesive-frictional interface model for mixed mode delamination

2016

Abstract A new interface constitutive model based on damage mechanics and frictional plasticity is presented. The model is thermodynamically consistent, it is able to accurately reproduce arbitrary mixed mode debonding conditions and it is proved that the separation work is always bounded between the fracture energy in mode I and the fracture energy in mode II. Analytical results are given for proportional loading paths and for two non-proportional loading paths, confirming the correct behavior of the model for complex loading histories. Numerical and analytical solutions are compared for three classical delamination tests and frictional effects on 4ENF are also considered.

Work (thermodynamics)Materials scienceConstitutive equation02 engineering and technologyPlasticity01 natural sciencesThermodynamic0203 mechanical engineeringDamage mechanicsMechanics of MaterialGeneral Materials Science0101 mathematicsComposite materialSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeMechanical EngineeringCohesive-frictional interfaceDelaminationMode (statistics)Fracture mechanicsMechanicsStrength of materials010101 applied mathematics020303 mechanical engineering & transportsMechanics of MaterialsMixed-mode delaminationMaterials Science (all)Settore ICAR/08 - Scienza Delle CostruzioniEngineering Fracture Mechanics
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