The Experts below are selected from a list of 15564 Experts worldwide ranked by ideXlab platform
Eric Maire - One of the best experts on this subject based on the ideXlab platform.
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modelling the competition between interface debonding and Particle Fracture using a plastic strain dependent cohesive zone
Engineering Fracture Mechanics, 2010Co-Authors: Yann Charles, R Estevez, Y Brechet, Eric MaireAbstract:In metal matrix composites made of elastic spherical reinforcements (zirconia and/or silica ceramics) embedded in an aluminium matrix two damage mechanisms are observed to trigger failure: Particle Fracture or decohesion at the Particle-matrix interface. Experimentally, it was shown that the dominant damage mechanism is governed by the matrix plastic characteristics: a soft matrix composite shows interface debonding while Particles breakdown occurs in the composite with a hard matrix. The physics underlying this dependence are related to plastic strain near the interface which can assist decohesion. We present a cohesive zone model for the Particle-matrix interface that accounts for local plastic strain effects, based on the analysis of the influence of dislocation accumulation on the local stress level. Such a description is shown able to capture the experimental observations while being simple to implement in a finite element code, as performed here with Abaqus.
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Modelling the competition between interface debonding and Particle Fracture using a plastic strain dependent cohesive zone
Engineering Fracture Mechanics, 2010Co-Authors: Yann Charles, Yves Bréchet, R Estevez, Eric MaireAbstract:In metal matrix composites made of elastic spherical reinforcements (zirconia and/or silica ceramics) embedded in an aluminium matrix two damage mechanisms are observed to trigger failure: Particle Fracture or decohesion at the Particle-matrix interface. Experimentally, it was shown that the dominant damage mechanism is governed by the matrix plastic characteristics: a soft matrix composite shows interface debonding while Particles breakdown occurs in the composite with a hard matrix. The physics underlying this dependence are related to plastic strain near the interface which can assist decohesion. We present a cohesive zone model for the Particle-matrix interface that accounts for local plastic strain effects, based on the analysis of the influence of dislocation accumulation on the local stress level. Such a description is shown able to capture the experimental observations while being simple to implement in a finite element code, as performed here with Abaqus.
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on the competition between Particle Fracture and Particle decohesion in metal matrix composites
Acta Materialia, 2004Co-Authors: Laurent Babout, Eric Maire, Yves Bréchet, Roger FougèresAbstract:A simple model for describing the competition between interface decohesion and Particle cracking as the elementary damage nucleation mechanisms in heterogeneous materials is proposed. It allows to rationalise the influence of the plastic behaviour of the ductile matrix and of the interfacial strength. The model is applied to analyse the dominant damage mechanisms in model composites with aluminium alloys matrix and spherical zirconia/silica reinforcement.
Frederic D R Bonnet - One of the best experts on this subject based on the ideXlab platform.
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deformation behavior and damage evaluation in a new titanium diboride tib2 steel based composite
Steel Research International, 2012Co-Authors: Zehoua Hadjemhamouche, Jeanpierre Chevalier, Frederic D R BonnetAbstract:Deformation behavior and damage evaluation of a new composite steel has been investigated by means of in situ three-point bend tests in the scanning electron microscope. The titanium diboride (TiB2)-reinforced steel composite is produced by in situ precipitation of the TiB2 Particles during eutectic solidification. This production process developed by ArcelorMittal leads to a steel composite with a significant increase in specific stiffness (>20%), and good strength/ductility compromise. The microstructures obtained consist of primary TiB2 crystals surrounded by a eutectic mixture of ferrite and TiB2 Particles. The primary mode of damage is Particle Fracture and inhomogeneous plastic deformation in the matrix. In contrast with other production process, Particle Fracture was more common than interfacial debonding indicating that interfacial strength is not the limiting factor in damage accumulation and Fracture in this composite. Crack growth occurred by Particle Fracture ahead of the crack tip, producing large microvoids, which then link up to the growing crack by ductile failure of the remaining matrix ligaments. The results suggest also that the cracks tended to avoid direct Particle interactions.
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Deformation Behavior and Damage Evaluation in a New Titanium Diboride (TiB2) Steel‐Based Composite
steel research international, 2012Co-Authors: Zehoua Hadjem-hamouche, Jeanpierre Chevalier, Yiting Cui, Frederic D R BonnetAbstract:Deformation behavior and damage evaluation of a new composite steel has been investigated by means of in situ three-point bend tests in the scanning electron microscope. The titanium diboride (TiB2)-reinforced steel composite is produced by in situ precipitation of the TiB2 Particles during eutectic solidification. This production process developed by ArcelorMittal leads to a steel composite with a significant increase in specific stiffness (>20%), and good strength/ductility compromise. The microstructures obtained consist of primary TiB2 crystals surrounded by a eutectic mixture of ferrite and TiB2 Particles. The primary mode of damage is Particle Fracture and inhomogeneous plastic deformation in the matrix. In contrast with other production process, Particle Fracture was more common than interfacial debonding indicating that interfacial strength is not the limiting factor in damage accumulation and Fracture in this composite. Crack growth occurred by Particle Fracture ahead of the crack tip, producing large microvoids, which then link up to the growing crack by ductile failure of the remaining matrix ligaments. The results suggest also that the cracks tended to avoid direct Particle interactions.
Yuehui He - One of the best experts on this subject based on the ideXlab platform.
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effect of extrusion and Particle volume fraction on the mechanical properties of sic reinforced al cu alloy composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010Co-Authors: Zhangwei Wang, Min Song, D H Xiao, Yuehui HeAbstract:Abstract This paper studied the combined effects of extrusion and reinforcement volume fraction on the mechanical properties of SiC Particles reinforced Al–Cu alloy composites. It has been shown that extrusion can improve the distributed homogeneity of the SiC Particles in the matrix and enhance the interfacial bonding strength of the composites. The hardness of the composites increased with increasing the volume fraction of the SiC Particles, while the yield strength and tensile strength of the composites decreased with increasing the volume fraction of the SiC Particles due to the Particle Fracture during extrusion. It has also been shown that the hardness increased with the aging time until reaching the maximum values, after which the hardness started to decrease. Fracture surface observations showed that the dominant Fracture mechanism of the composites is ductile Fracture of the matrix, accompanied by the pull-out of the Particles from the matrix before extrusion or by the SiC Particle Fracture after extrusion, respectively.
Jeanpierre Chevalier - One of the best experts on this subject based on the ideXlab platform.
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In-situ experimental and numerical studies of the damage evolution and Fracture in a Fe-TiB2 composite
Materials Science and Engineering: A, 2018Co-Authors: Zehoua Hadjem-hamouche, Katell Derrien, Eva Héripré, Jeanpierre ChevalierAbstract:A joint experimental and modelling study of plastic strain and ensuing damage in a novel metal matrix composite (Fe-TiB2) is presented. Damage is observed and quantified using SEM images processing and Acoustic Emission (AE) analysis. The use of AE confirms that the surface damage observed is strongly correlated to damage in the bulk of the material. The primary mode of damage is Particle Fracture. Very little Particle decohesion is observed, indicating an exceptionally good cohesion of the steel/Particle interface. Damage is initiated soon after the composite yield point is reached and increases significantly with strain. Macroscopic failure of the tensile specimen occurs when about 25% of the Particles are Fractured. This corresponds to about 21% engineering strain. Using in-situ SEM tensile tests with quantitative digital image correlation (DIC), full-field strain measurements are obtained and Particle Fracture quantified. The results of fields measurements are compared to results of a FFT based homogenization method with boundary conditions retrieved from the experiment. A good agreement is found between the DIC-measured and FFT-predicted results. Estimated values of the Particle Fracture stress are obtained.
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deformation behavior and damage evaluation in a new titanium diboride tib2 steel based composite
Steel Research International, 2012Co-Authors: Zehoua Hadjemhamouche, Jeanpierre Chevalier, Frederic D R BonnetAbstract:Deformation behavior and damage evaluation of a new composite steel has been investigated by means of in situ three-point bend tests in the scanning electron microscope. The titanium diboride (TiB2)-reinforced steel composite is produced by in situ precipitation of the TiB2 Particles during eutectic solidification. This production process developed by ArcelorMittal leads to a steel composite with a significant increase in specific stiffness (>20%), and good strength/ductility compromise. The microstructures obtained consist of primary TiB2 crystals surrounded by a eutectic mixture of ferrite and TiB2 Particles. The primary mode of damage is Particle Fracture and inhomogeneous plastic deformation in the matrix. In contrast with other production process, Particle Fracture was more common than interfacial debonding indicating that interfacial strength is not the limiting factor in damage accumulation and Fracture in this composite. Crack growth occurred by Particle Fracture ahead of the crack tip, producing large microvoids, which then link up to the growing crack by ductile failure of the remaining matrix ligaments. The results suggest also that the cracks tended to avoid direct Particle interactions.
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Deformation Behavior and Damage Evaluation in a New Titanium Diboride (TiB2) Steel‐Based Composite
steel research international, 2012Co-Authors: Zehoua Hadjem-hamouche, Jeanpierre Chevalier, Yiting Cui, Frederic D R BonnetAbstract:Deformation behavior and damage evaluation of a new composite steel has been investigated by means of in situ three-point bend tests in the scanning electron microscope. The titanium diboride (TiB2)-reinforced steel composite is produced by in situ precipitation of the TiB2 Particles during eutectic solidification. This production process developed by ArcelorMittal leads to a steel composite with a significant increase in specific stiffness (>20%), and good strength/ductility compromise. The microstructures obtained consist of primary TiB2 crystals surrounded by a eutectic mixture of ferrite and TiB2 Particles. The primary mode of damage is Particle Fracture and inhomogeneous plastic deformation in the matrix. In contrast with other production process, Particle Fracture was more common than interfacial debonding indicating that interfacial strength is not the limiting factor in damage accumulation and Fracture in this composite. Crack growth occurred by Particle Fracture ahead of the crack tip, producing large microvoids, which then link up to the growing crack by ductile failure of the remaining matrix ligaments. The results suggest also that the cracks tended to avoid direct Particle interactions.
Lin Geng - One of the best experts on this subject based on the ideXlab platform.
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strengthening and Fracture behaviors in sicp al composites with network Particle distribution architecture
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2019Co-Authors: Xiang Gao, Xuexi Zhang, Lin GengAbstract:Abstract Recent experimental works proved that metal-matrix composites (MMCs) with quasi-continuous network architecture presented higher stiffness and strength than homogeneous composites. Here a three-dimensional (3D) model with network Particle architecture was established and the strengthening and Fracture behaviors were numerically investigated. The results show that SiC Particle walls parallel to the external load direction have higher load-carrying capacity, while the walls perpendicular to load direction exhibit similar stress with homogeneous composites. So the strengthening effect of network architecture is attributed to the high load-bearing capacity of concentrated SiC Particle walls rather than dispersed Particles. In network composites, Particle Fracture in SiC walls parallel to the load direction results in the crack initiation by interfacial decohesion at small load (exx = 1.0%) and SiC Particle Fracture at higher load (exx = 2.0%). Large matrix phase can blunt and deflect cracks, and thus reduce the crack propagation rate. On the other hand, Particle Fracture initially occurs on SiC walls perpendicular to the load direction. The main crack propagates rapidly through the network boundary.
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Strengthening and Fracture behaviors in SiCp/Al composites with network Particle distribution architecture
Materials Science and Engineering: A, 2019Co-Authors: Xiang Gao, Xuexi Zhang, Lin GengAbstract:Abstract Recent experimental works proved that metal-matrix composites (MMCs) with quasi-continuous network architecture presented higher stiffness and strength than homogeneous composites. Here a three-dimensional (3D) model with network Particle architecture was established and the strengthening and Fracture behaviors were numerically investigated. The results show that SiC Particle walls parallel to the external load direction have higher load-carrying capacity, while the walls perpendicular to load direction exhibit similar stress with homogeneous composites. So the strengthening effect of network architecture is attributed to the high load-bearing capacity of concentrated SiC Particle walls rather than dispersed Particles. In network composites, Particle Fracture in SiC walls parallel to the load direction results in the crack initiation by interfacial decohesion at small load (exx = 1.0%) and SiC Particle Fracture at higher load (exx = 2.0%). Large matrix phase can blunt and deflect cracks, and thus reduce the crack propagation rate. On the other hand, Particle Fracture initially occurs on SiC walls perpendicular to the load direction. The main crack propagates rapidly through the network boundary.
