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Constitutive law covering granular materials to metals
176A 933288 Motion of a fluid-saturated porous solid Kowalski, S J Trans Porous Media II9, N1/2, Oct 1992, t'39-47 A two-parameter (volume porosity and structural permeability) structure model for approximation of real porous structures is presented. Macroscopic mass and momentum balance equations are derived for deformation of such a medium saturated with liquid. Equations of motion are derived with coupling terms via cross-mass couplings. In their linear form, these equations are equivalent to the well-known Biot equations.
933289 Eiustoplustidty model in porous media theories Ehlers, W Trans Porous Media V9, N1/2, Oct 1992, P49-59 Porous materials can be described within the framework of continuum mechanics using mixture theory extended by the concept of volume fractions. Diverse field functions of fluid and solid phases are represented by macroscale average functions. A binary model with incompressible constituents is investigated waking use of the second grade character of general heterogeneous materials. Constitutive equations are developed for the matrix, the viscous pore fluid, and the different interactions between the constituents. The model is applicable to geological materials where elastic deformation is generally small and the plastic range is governed by kinematic hardening properties.
933290 Extended internal geometry description in modelHng_of dynamics of fluid-filled permeable media Kaczraarek, M Traas Porous Media V9, N1/2, Oct 1992, Pl13-121 A procedure is outlined for consistent study of the role of internal geometry on the mechanical behaviour of fluid-filled porous media. The influence of porous structure on the mechanical couplings resulting from relative motion of the phases is investigated. Constitutive equations are derived in terms of relatively few parameters describing the internal geometry of the medium and component parameters.
933291 Pore structure in dynamic behaviour of saturated materials Kubik, J Tratts Porous Media V9, N1/2, Oct 1992, P15-24 A macroscopic approach to description of a deformable porous medium in which a liquid is moving is presented. It considers matrix and fluid, both of which maintain their integrity during a deformation process. The skeleton pore structure is defined by two macroparameters, volume porosity and a structural permeability quantity. Unlike the volume fraction theory approach, it is possible to describe the virtual mass effect as well as dynamic and inertial couplings between solid and fluid provoked by the pores. The resulting equations of motion ensure a proper transition to Biot's linear dynamic equations.
933292 Continuum modelling of porous rock with arbitrary joint sets, incinding coupled deformation-diffnmlon behavior Cho, T F; Haimson, B C; Plesha, M E Proc 7th ISRM International Cmlgress on Rock Mechanics, Aachen, 16-20 S~ptember 1991 V1, P805-811. Publ Rotterdam: A A Balkema, 1991 A three dimensional constitutive model for saturated porous jointed rocks is proposed. The intact rock is assumed linear elastic with isotropic permeability, the joint sets linear elastic with isotropic in-plane permeability. A continuum theory is obtained by adding the compliances and fluid flows associated with the intact rock and each joint set. Fluid diffusion through and between joint sets and the intact rock is possible. Joint set characteristics control anisotropy. Three examples of using the model are presented: coupled deformation-diffusion, a pumped storage tunnel, and a rock slope. 933293 Extended Kalman filter-finite element for geotechnicai problems Hoshiya, M; Sutoh, A IVoc 6th ASCE Speciality Conference on Probabi~tic Mechanics and Structural attd Geatoclmical Reliability, Denver, 8-10 July 1992 P128-131. Publ New York: ASCE, 1992 The extended Kalman filter, essentially a method of sequential least mean squares estimation, has been applied in many structural identification problems. For geotechnical engineering problems with sparse observational data, the Kalman filterweighted local iteration (KF-WLI) procedure has been developed and incorporated with the finite element method to identify unknown parameters. A numerical example is presented of parameter identification in a plane strain field. 933294 FEM analysis of pressuremeter tests in calibration chamber using a hyperbelic constitutive model for sands Di Bacco, R; Ghionna, V N; Mazza, G; Pellegriui, R Proc Ninth Asian Regiomd Conference on Soil Moclumics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P15-18. Publ Thailand." Southeast Asian Geotechnical Society, 1991 The nonlinear elastic axisymmetric finite element code STIPAX has been used to model self-boring pressuremeter tests in Tieino sand in a calibration chamber. Constitutive parameters for the hyperbolic soil model were obtained from triaxial and uniaxial compression tests. Model and experimental results agree well for overconsolidated sands, but not for normally consolidated samples. Much improved fit is obtained if the initial tangent modulus (Ei) used in the analysis is replaced by the unloading-reloading modulus (Eur). 933295 Constitutive law covering granular materials to metals Matsuoka, H; Sun, D A Proc Ninth A s i a Regiomd Coufereuce on Soil Meckat~s and Fomulatitm Esgizteri~, Baqkok, 9-13 December 1991 V1, P55-58. Pubi Thailand: Southeast Asian Geotechnical Society, 1991 A unified constitutive law is presented, based on the Extended Spatially Mobilised Plane (Extended SMP) with a parameter bonding stress, which can vary from zero for cohesionless frictional materials to values tending to infinity for cohesive materials such as metals. A cement treated sand was chosen as an intermediate cohesive-frictional material and triaxial compression and triaxial extension tests have been carried out to check the constitutive model proposed.
© 1993 Pergamon Press Ltd. Reproduction not permitted
933289 Eiustoplustidty model in porous media theories Ehlers, W Trans Porous Media V9, N1/2, Oct 1992, P49-59 Porous materials can be described within the framework of continuum mechanics using mixture theory extended by the concept of volume fractions. Diverse field functions of fluid and solid phases are represented by macroscale average functions. A binary model with incompressible constituents is investigated waking use of the second grade character of general heterogeneous materials. Constitutive equations are developed for the matrix, the viscous pore fluid, and the different interactions between the constituents. The model is applicable to geological materials where elastic deformation is generally small and the plastic range is governed by kinematic hardening properties.
933290 Extended internal geometry description in modelHng_of dynamics of fluid-filled permeable media Kaczraarek, M Traas Porous Media V9, N1/2, Oct 1992, Pl13-121 A procedure is outlined for consistent study of the role of internal geometry on the mechanical behaviour of fluid-filled porous media. The influence of porous structure on the mechanical couplings resulting from relative motion of the phases is investigated. Constitutive equations are derived in terms of relatively few parameters describing the internal geometry of the medium and component parameters.
933291 Pore structure in dynamic behaviour of saturated materials Kubik, J Tratts Porous Media V9, N1/2, Oct 1992, P15-24 A macroscopic approach to description of a deformable porous medium in which a liquid is moving is presented. It considers matrix and fluid, both of which maintain their integrity during a deformation process. The skeleton pore structure is defined by two macroparameters, volume porosity and a structural permeability quantity. Unlike the volume fraction theory approach, it is possible to describe the virtual mass effect as well as dynamic and inertial couplings between solid and fluid provoked by the pores. The resulting equations of motion ensure a proper transition to Biot's linear dynamic equations.
933292 Continuum modelling of porous rock with arbitrary joint sets, incinding coupled deformation-diffnmlon behavior Cho, T F; Haimson, B C; Plesha, M E Proc 7th ISRM International Cmlgress on Rock Mechanics, Aachen, 16-20 S~ptember 1991 V1, P805-811. Publ Rotterdam: A A Balkema, 1991 A three dimensional constitutive model for saturated porous jointed rocks is proposed. The intact rock is assumed linear elastic with isotropic permeability, the joint sets linear elastic with isotropic in-plane permeability. A continuum theory is obtained by adding the compliances and fluid flows associated with the intact rock and each joint set. Fluid diffusion through and between joint sets and the intact rock is possible. Joint set characteristics control anisotropy. Three examples of using the model are presented: coupled deformation-diffusion, a pumped storage tunnel, and a rock slope. 933293 Extended Kalman filter-finite element for geotechnicai problems Hoshiya, M; Sutoh, A IVoc 6th ASCE Speciality Conference on Probabi~tic Mechanics and Structural attd Geatoclmical Reliability, Denver, 8-10 July 1992 P128-131. Publ New York: ASCE, 1992 The extended Kalman filter, essentially a method of sequential least mean squares estimation, has been applied in many structural identification problems. For geotechnical engineering problems with sparse observational data, the Kalman filterweighted local iteration (KF-WLI) procedure has been developed and incorporated with the finite element method to identify unknown parameters. A numerical example is presented of parameter identification in a plane strain field. 933294 FEM analysis of pressuremeter tests in calibration chamber using a hyperbelic constitutive model for sands Di Bacco, R; Ghionna, V N; Mazza, G; Pellegriui, R Proc Ninth Asian Regiomd Conference on Soil Moclumics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P15-18. Publ Thailand." Southeast Asian Geotechnical Society, 1991 The nonlinear elastic axisymmetric finite element code STIPAX has been used to model self-boring pressuremeter tests in Tieino sand in a calibration chamber. Constitutive parameters for the hyperbolic soil model were obtained from triaxial and uniaxial compression tests. Model and experimental results agree well for overconsolidated sands, but not for normally consolidated samples. Much improved fit is obtained if the initial tangent modulus (Ei) used in the analysis is replaced by the unloading-reloading modulus (Eur). 933295 Constitutive law covering granular materials to metals Matsuoka, H; Sun, D A Proc Ninth A s i a Regiomd Coufereuce on Soil Meckat~s and Fomulatitm Esgizteri~, Baqkok, 9-13 December 1991 V1, P55-58. Pubi Thailand: Southeast Asian Geotechnical Society, 1991 A unified constitutive law is presented, based on the Extended Spatially Mobilised Plane (Extended SMP) with a parameter bonding stress, which can vary from zero for cohesionless frictional materials to values tending to infinity for cohesive materials such as metals. A cement treated sand was chosen as an intermediate cohesive-frictional material and triaxial compression and triaxial extension tests have been carried out to check the constitutive model proposed.
© 1993 Pergamon Press Ltd. Reproduction not permitted