The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Asaoka Akira - One of the best experts on this subject based on the ideXlab platform.
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realization of uniform deformation of soil specimen under undrained Plane Strain Condition based on soil water coupled finite deformation analysis considering inertia forces
Soils and Foundations, 2013Co-Authors: Toshihiro Noda, Binbin Xu, Asaoka AkiraAbstract:Based on a soil–water coupled finite deformation analysis, theoretical considerations and numerical calculations were carried out under the undrained Plane Strain Condition in order to reproduce a uniform deformation field. Rather than the “quasi-static” equation of motion, which does not include inertia forces, a dynamic equation of motion which includes inertia forces was used. At first, a theoretical consideration was carried out to realize uniform deformation for a saturated soil that satisfied the element-wise undrained/constant-volume Condition. This presents an “infinitely slow loading” case without ignoring the inertia term based on the u–p formulation. In other words, it can be seen that under general slow loading that is not infinitely slow, a gradient in the pore water pressure will always be produced, resulting in the migration of pore water and loss/collapse of uniformity. This first conclusion is useful for verifying numerical analysis code made in the finite deformation regime. Next, the uniform deformation of a Plane Strain rectangular soil specimen was measured under constant cell pressure and undrained boundary Conditions using a dynamic soil–water coupled analysis in which the SYS Cam-clay model was employed as the elasto-plastic constitutive model for the soil skeleton. In addition, the effects of the loading rates as well as loading applications, with/without inertia forces, on the loss of uniformity in deformation were shown to have a significant influence on the inertia term even though the loss itself was extremely small.
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Realization of uniform deformation of soil specimen under undrained Plane Strain Condition based on soil–water coupled finite deformation analysis considering inertia forces
Soils and Foundations, 2013Co-Authors: Toshihiro Noda, Asaoka AkiraAbstract:Based on a soil–water coupled finite deformation analysis, theoretical considerations and numerical calculations were carried out under the undrained Plane Strain Condition in order to reproduce a uniform deformation field. Rather than the “quasi-static” equation of motion, which does not include inertia forces, a dynamic equation of motion which includes inertia forces was used. At first, a theoretical consideration was carried out to realize uniform deformation for a saturated soil that satisfied the element-wise undrained/constant-volume Condition. This presents an “infinitely slow loading” case without ignoring the inertia term based on the u–p formulation. In other words, it can be seen that under general slow loading that is not infinitely slow, a gradient in the pore water pressure will always be produced, resulting in the migration of pore water and loss/collapse of uniformity. This first conclusion is useful for verifying numerical analysis code made in the finite deformation regime. Next, the uniform deformation of a Plane Strain rectangular soil specimen was measured under constant cell pressure and undrained boundary Conditions using a dynamic soil–water coupled analysis in which the SYS Cam-clay model was employed as the elasto-plastic constitutive model for the soil skeleton. In addition, the effects of the loading rates as well as loading applications, with/without inertia forces, on the loss of uniformity in deformation were shown to have a significant influence on the inertia term even though the loss itself was extremely small.
Toshihiro Noda - One of the best experts on this subject based on the ideXlab platform.
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realization of uniform deformation of soil specimen under undrained Plane Strain Condition based on soil water coupled finite deformation analysis considering inertia forces
Soils and Foundations, 2013Co-Authors: Toshihiro Noda, Binbin Xu, Asaoka AkiraAbstract:Based on a soil–water coupled finite deformation analysis, theoretical considerations and numerical calculations were carried out under the undrained Plane Strain Condition in order to reproduce a uniform deformation field. Rather than the “quasi-static” equation of motion, which does not include inertia forces, a dynamic equation of motion which includes inertia forces was used. At first, a theoretical consideration was carried out to realize uniform deformation for a saturated soil that satisfied the element-wise undrained/constant-volume Condition. This presents an “infinitely slow loading” case without ignoring the inertia term based on the u–p formulation. In other words, it can be seen that under general slow loading that is not infinitely slow, a gradient in the pore water pressure will always be produced, resulting in the migration of pore water and loss/collapse of uniformity. This first conclusion is useful for verifying numerical analysis code made in the finite deformation regime. Next, the uniform deformation of a Plane Strain rectangular soil specimen was measured under constant cell pressure and undrained boundary Conditions using a dynamic soil–water coupled analysis in which the SYS Cam-clay model was employed as the elasto-plastic constitutive model for the soil skeleton. In addition, the effects of the loading rates as well as loading applications, with/without inertia forces, on the loss of uniformity in deformation were shown to have a significant influence on the inertia term even though the loss itself was extremely small.
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Realization of uniform deformation of soil specimen under undrained Plane Strain Condition based on soil–water coupled finite deformation analysis considering inertia forces
Soils and Foundations, 2013Co-Authors: Toshihiro Noda, Asaoka AkiraAbstract:Based on a soil–water coupled finite deformation analysis, theoretical considerations and numerical calculations were carried out under the undrained Plane Strain Condition in order to reproduce a uniform deformation field. Rather than the “quasi-static” equation of motion, which does not include inertia forces, a dynamic equation of motion which includes inertia forces was used. At first, a theoretical consideration was carried out to realize uniform deformation for a saturated soil that satisfied the element-wise undrained/constant-volume Condition. This presents an “infinitely slow loading” case without ignoring the inertia term based on the u–p formulation. In other words, it can be seen that under general slow loading that is not infinitely slow, a gradient in the pore water pressure will always be produced, resulting in the migration of pore water and loss/collapse of uniformity. This first conclusion is useful for verifying numerical analysis code made in the finite deformation regime. Next, the uniform deformation of a Plane Strain rectangular soil specimen was measured under constant cell pressure and undrained boundary Conditions using a dynamic soil–water coupled analysis in which the SYS Cam-clay model was employed as the elasto-plastic constitutive model for the soil skeleton. In addition, the effects of the loading rates as well as loading applications, with/without inertia forces, on the loss of uniformity in deformation were shown to have a significant influence on the inertia term even though the loss itself was extremely small.
Young Suk Kim - One of the best experts on this subject based on the ideXlab platform.
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Bifurcation behaviour of bilayered tubes subjected to uniform shrinkage under Plane Strain Condition
International Journal of Solids and Structures, 1992Co-Authors: Yoshihiro Tomita, Young Suk KimAbstract:Abstract Nonaxisymmetric bifurcation behaviour of bilayered tubes subjected to uniform shrinkage at the external surface under Plane Strain Conditions has been investigated and compared with that of single tubes. The influence of the thickness ratio and the ratios of material properties upon the bifurcation behaviour has been clarified. The yield stress ratio and hardening exponent ratio substantially affect the bifurcation mode with long wavelength. Surface-type bifurcation depends entirely on the material characteristics of the inner tube, so that the surface-type bifurcation point of a bilayered tube nearly coincides with that of a single tube with the same material properties as those of the inner tube.
Binbin Xu - One of the best experts on this subject based on the ideXlab platform.
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realization of uniform deformation of soil specimen under undrained Plane Strain Condition based on soil water coupled finite deformation analysis considering inertia forces
Soils and Foundations, 2013Co-Authors: Toshihiro Noda, Binbin Xu, Asaoka AkiraAbstract:Based on a soil–water coupled finite deformation analysis, theoretical considerations and numerical calculations were carried out under the undrained Plane Strain Condition in order to reproduce a uniform deformation field. Rather than the “quasi-static” equation of motion, which does not include inertia forces, a dynamic equation of motion which includes inertia forces was used. At first, a theoretical consideration was carried out to realize uniform deformation for a saturated soil that satisfied the element-wise undrained/constant-volume Condition. This presents an “infinitely slow loading” case without ignoring the inertia term based on the u–p formulation. In other words, it can be seen that under general slow loading that is not infinitely slow, a gradient in the pore water pressure will always be produced, resulting in the migration of pore water and loss/collapse of uniformity. This first conclusion is useful for verifying numerical analysis code made in the finite deformation regime. Next, the uniform deformation of a Plane Strain rectangular soil specimen was measured under constant cell pressure and undrained boundary Conditions using a dynamic soil–water coupled analysis in which the SYS Cam-clay model was employed as the elasto-plastic constitutive model for the soil skeleton. In addition, the effects of the loading rates as well as loading applications, with/without inertia forces, on the loss of uniformity in deformation were shown to have a significant influence on the inertia term even though the loss itself was extremely small.
Yoshihiro Tomita - One of the best experts on this subject based on the ideXlab platform.
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modeling and simulation of response of pariticulate reinforced composite materials under a Plane Strain Condition
Transactions of the Japan Society of Mechanical Engineers. A, 1998Co-Authors: Takehiro Fujimoto, Yoshihiro TomitaAbstract:In order to determine the characteristic feature in the deformation behavior of particulatereinforced composite material, a constitutive equation that takes into account the characteristic length scale has been developed using the Strain gradient theory. By means of the Plane-Strain finite element method with the proposed constitutive equation, a series of simulations of inhomogeneous deformation behavior of composite materials with different volume fractions of reinforcement, particle size and distribution pattern of reinforcement have been performed. As a result, it has been determined that the resistance of composite material to deformation is substantially increased with the refinement of the particle size under constant volume fraction of reinforcement. Furthermore, the regulaization of the distribution pattern which increases the value of the maximum Strain gradient in the matrix contributes toward improving the resistance to deformation.
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FLOW LOCALIZATION IN THERMO-ELASTO-VISCOPLASTIC MATERIALS UNDER Plane Strain Condition
Advances in Engineering Plasticity and its Applications, 1993Co-Authors: Yoshihiro Tomita, Koji MimuraAbstract:The material Strain rate and temperature sensitivities are incorporated into a numerical simulation of tension and compression of the Plane Strain blocks under a wide range of deformation rates. The effect of deformation rate, Strain rate and temperature sensitivities of the materials, the Strain rate history dependence of the material and the size of the specimen on the flow localization is explored.
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Bifurcation behaviour of bilayered tubes subjected to uniform shrinkage under Plane Strain Condition
International Journal of Solids and Structures, 1992Co-Authors: Yoshihiro Tomita, Young Suk KimAbstract:Abstract Nonaxisymmetric bifurcation behaviour of bilayered tubes subjected to uniform shrinkage at the external surface under Plane Strain Conditions has been investigated and compared with that of single tubes. The influence of the thickness ratio and the ratios of material properties upon the bifurcation behaviour has been clarified. The yield stress ratio and hardening exponent ratio substantially affect the bifurcation mode with long wavelength. Surface-type bifurcation depends entirely on the material characteristics of the inner tube, so that the surface-type bifurcation point of a bilayered tube nearly coincides with that of a single tube with the same material properties as those of the inner tube.