Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"Visco-plastic"”.
-
A New Visco-Plastic Device for Seismic Protection of Structures
A new visco-plastic damper for seismic protection is introduced. This device combines and enhances many of the proven characteristics of both displacement-dependent and velocity-dependent devices. The device consists of a block of a high-damping viscoelastic material sandwiched between two steel …
-
A visco-plastic constitutive model for snow. Theoretical basis and numerical implementation
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Elastic visco-plastic model of steel solidification with local damage and failure
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
-
A vertex based discretisation scheme applied to material non-linearity within a multi-physics finite volume framework
… specifically materials described by an elasto-visco-plastic constitutive relationship and a von-Mises yield criterion. The motivation is to contribute the non-linear CSM capability to an integrated FV framework for the comprehensive solution of the thermo-mechanical behaviour exhibited by the …
-
One Dimensional Computer Analysis of Simultaneous Consolidation and Creep of Clay
… soil profiles. The program uses an elasto-visco-plastic model that can simulate both consolidation and creep in a single consistent analysis. The finite element program uses standard oedometer test data to model stress-strain-time relationships, and the effect of strain rate on …
-
A constitutive theory for the mechanical response of amorphous metals at high temperatures spanning the glass transition temperature : application to microscale thermoplastic forming of Zr₄₁.₂Ti₁₃.₈Cu₁₂.₅Ni₁₀Be₂₂.₅
… method for bulk metallic glasses, called thermoplasticforming has emerged. As with any emerging technology, the scientific basis for this process is at present fragmented and limited. As a result their is no generally agreed upon theory to model the large-deformation, elastic-visco-plastic …
-
A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
Amorphous thermoplastic polymers are important engineering materials; however, their nonlinear, strongly temperature- and rate-dependent elastic-visco-plastic behavior has, until now, not been very well understood. The behavior has previously been modeled with mixed success by existing constitutive …
-
Thermomechanical modelling of powder compaction and sintering
An elastic-visco-plastic thermomechanical model for cold forming of ceramic powders and subsequent sintering is introduced and based on micromechanical modelling of the compaction process of granulates. Micromechanics is shown to yield an upper-bound estimate to the compaction curve of a granular …
-
MODELING OF INTERFACE STRENGTH AS WELL AS INTERFACE DEFORMATION BASED ON NANOMECHANICS AND DEVELOPMENT OF INTERFACE DATABASE SYSTEMS
… organic and inorganic phases at the nanoscale. A visco-plastic interfacial sliding model is used to calculate the interface strength and the shear viscosity of each interfacial system. In order to predict the effect of interface on the behavior of the material at the continuum level, a combined
-
Mechanical and geological controls on the long-term evolution of normal faults
… numerical models that treat the lithosphere as a visco-plastic solid properly predict fault evolution only when the rate-dependent viscous flexural wavelength of the lithosphere is accommodated within the numerical domain. In Chapter 5, I investigate the growth of normal faults in relation to a …
-
CFD modelling of fluid flow and contaminant transport in hydrogeological systems
… under system stresses is described by elasto-visco-plastic constitutive relationships and the coupling between CFD and CSM processes. The designed simulation models are used to calibrate the flow problems associated with regional groundwater levels estimation, determination of soil hydraulic …
-
Deformation Mechanisms at Grain Boundaries in Polycrystal Plasticity
… The effect of boundary structure on the plastic deformation of metals is modeled by computing the aggregate response of composite grains in the visco-plastic self-consistent scheme. Assuming a planar boundary, the composite grain model accounts for the interaction between neighboring …
-
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… 3, mantle thermal and melting models for a visco-plastic rheology are developed to investigate the process of mantle melting and crustal accretion at ITSCs within segmented transform faults, and are applied to the Siqueiros transform fault system. Models in which melt migrates into the …
-
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… 3, mantle thermal and melting models for a visco-plastic rheology are developed to investigate the process of mantle melting and crustal accretion at ITSCs within segmented transform faults, and are applied to the Siqueiros transform fault system. Models in which melt migrates into the …
-
Computational modeling of trabecular bone in lower extremity injuries due to impact
… cell. For the solid part of the trabecular, a visco-elastic visco-plastic constitutive model developed by Socrate's group [15] for cortical bone was applied. For the dynamic simulations, the effect of strain rate on the response of the bone microstructure was investigated and compared to …
-
Mechanical and geological controls on the long-term evolution of normal faults
… fault growth, which is well described by elasto-plastic flexure models. I demonstrate that numerical models that treat the lithosphere as a visco-plastic solid can properly predict fault evolution only when the rate-dependent viscous flexural wavelength of the lithosphere is accommodated within …
-
Thermo-mechanical model of steel shell behavior in continuous slab casting
… flow, thermal distortion of the mold and the visco-plastic mechanical behavior of the steel. Coupling between the thermal and the mechanical portions of the model are based on the mutual dependence of heat transfer across the interface between the shell and the mold and the size of the gap. …
-
Computational Design of Transparent Polymeric Laminates subjected to Low-velocity Impact
… The PMMA and the PC are modeled as elasto-thermo-visco-plastic and adhesives as viscoelastic. Their failure criteria are stated and simulated by the element deletion technique. Values of material parameters of the PMMA and the PC are taken from the literature, and those of adhesives determined …
-
Local Water Slamming of Nonlinear Elastic Sandwich Hulls, and Adiabatic Shear Banding in Simple Shearing Deformations of Thermoelastoviscoplastic Bodies
… of a homogeneous and isotropic thermo-elasto-visco-plastic body with uniform deformations perturbed to simulate the effect of a defect. The resulting coupled nonlinear ordinary differential equations are integrated with respect to time by using the package, LSODE (Livermore Solver for Ordinary …
-
A motion of freely oscillating droplet of a yield stress fluid: analysis and numerical studies
… of change is in balance with the internal energy viscoplastic dissipation and the work of external forces. Further, we consider free small-amplitude oscillations of a droplet of Herschel-Bulkley fluid under the action of surface tension forces. Under certain assumptions it is shown that the finite …
Page 1 of 2