The Experts below are selected from a list of 27573 Experts worldwide ranked by ideXlab platform
Aldo Marano - One of the best experts on this subject based on the ideXlab platform.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
Samuel Forest - One of the best experts on this subject based on the ideXlab platform.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
Fusao Oka - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of progressive failure in cut slope of soft rock using a soil water coupled finite element analysis
Soils and Foundations, 2003Co-Authors: Feng Zhang, Atsushi Yashima, Hitomi Osaki, Toshihisa Adachi, Fusao OkaAbstract:ABSTRACT In the present paper, based onan elastoplastic Model with strain hardening and strain Softening, a soil-water coupled finite element analysis is conducted to investigate the progressive failure of a cut slope in a Model ground. In order to verify the validity of the analyses related to the strain-Softening behavior, numerical analyses are firstly conducted for plane-strain compression in different meshes and loading steps under complete drained condition. It is confirmed by the analyses that the analysis conducted in this paper has a small dependency on the mesh size. Then, the mechanical behaviours of a cut slope, such as the change of excessive pore-water pressure, the redistribution of stress in ground due to strain Softening, the propagation of shear band and the progressive failure are discussed in detail by the soil-water coupled finite element analysis. It is found that a soil-water coupled analysis based on an elastoplastic Model can describe the time dependent behavior of soft rock in boundary-value problems. It is also found that a soil-water coupled analysis based on a strain-Softening Model can simulate the progressive failure of a cut slope.
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an elastoplastic strain hardening and strain Softening constitutive Model for soft rock considering the influence of intermediate stress
Soils and Foundations, 2003Co-Authors: Feng Zhang, Atsushi Yashima, Toshihisa Adachi, Fusao OkaAbstract:In this paper, by introducing a tij concept and Matsuoka-Nakai failure criteria into the Model proposed by Oka and Adachi, a modified strain-Softening Model is developed to consider the influence of the intermediate principal stress that may greatly affect the strength and stress-dilatancy relation of geologic materials under different loading paths. The original characteristics of the Model, such as the ability to describe not only the strain Softening behavior of soft rock but also the stress-dilatancy relation, the ability to obtain a unique solution for initial value and boundary value problems in a finite element analysis, remain valid in the modified Model. Its validity is verified by compression tests on artificial soft rock under plane-strain condition.
Nigel Scott - One of the best experts on this subject based on the ideXlab platform.
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A cyclic stress Softening Model for the Mullins effect
International Journal of Solids and Structures, 2013Co-Authors: Stephen R. Rickaby, Nigel ScottAbstract:Abstract In this paper the inelastic features of stress relaxation, hysteresis and residual strain are combined with the Arruda–Boyce eight-chain Model of elasticity, in order to develop a Model that is capable of describing the Mullins effect for cyclic stress-Softening of an incompressible hyperelastic material, in particular a carbon-filled rubber vulcanizate. We have been unable to identify in the literature any other Model that takes into consideration all the above inelastic features of the cyclic stress-Softening of carbon-filled rubber. Our Model compares favourably with experimental data and gives a good description of stress-Softening, hysteresis, stress relaxation, residual strain and creep of residual strain.
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Transversely isotropic cyclic stress-Softening Model for the Mullins effect
Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences, 2012Co-Authors: Stephen R. Rickaby, Nigel ScottAbstract:This paper Models stress Softening during cyclic loading and unloading of an elastomer. The paper begins by reModelling the primary loading curve to include a Softening function and goes on to derive nonlinear transversely isotropic constitutive equations for the elastic response, stress relaxation, residual strain and creep of residual strain. These ideas are combined with a transversely isotropic version of the Arruda–Boyce eight-chain Model to develop a constitutive relation that is capable of accurately representing the Mullins effect during cyclic stress Softening for a transversely isotropic, hyperelastic material, in particular, a carbon-filled rubber vulcanizate.
Lionel Gelebart - One of the best experts on this subject based on the ideXlab platform.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
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intragranular localization induced by Softening crystal plasticity analysis of slip and kink bands localization modes from high resolution fft simulations results
Acta Materialia, 2019Co-Authors: Aldo Marano, Lionel Gelebart, Samuel ForestAbstract:Abstract We investigate the ability of local continuum crystal plasticity theory to simulate intense slip localization at incipient plasticity observed experimentally in metals exhibiting Softening mechanisms. A generic strain Softening Model is implemented within a massively parallel FFT solver framework to study intragranular strain localization throughout high resolution polycrystalline simulations. It is coupled to a systematic analysis strain localization modes: Equivalent plastic strain and lattice rotation fields are processed to create binary maps of slip and kink bands populations, estimate their volume fraction and mean strain level. High resolution simulations show the formation of an intragranular localization band network. The associated localization maps are used to identify accurately slip and kink bands populations and highlight the distinct evolution of kink bands, influenced by lattice rotation. Results highlight that the analysis of the nature of localization bands in numerical studies is fundamental to asses the validity of polycrystalline simulations. Indeed, it is evidenced that selection between slip or kink localization modes is only due to grain to grain incompatibilities as these two localization modes are equivalent in classical crystal plasticity Models. As a result they predict the formation of a large amount of kink bands in contradiction with experimental observations of Softening metals. We show that this holds for complex physics based Models too. Hence, the use of classical crystal plasticity for strain localization simulation should be reconsidered in order to predict realistic localization modes.
