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 16 of 16 for “"time dependent deformation"”.
-
Time dependent deformation and stress diffusion in the lithosphere
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
-
Continuum mechanical analysis of space and time dependent deformation pattern of brain with blunt injury
Deformation of human brain due to acceleration impact has been widely accepted as the direct connection to the Trauma Brain Injury (TBI). However, the limitation of obtaining deformation data of TBI is a major obstacle to understanding TBI mechanism. This experiment mainly focuses on developing a …
-
Extension of the Local Strain Fatigue Analysis Concepts to Incorporate Time Dependent Deformation in Titanium(6)-Aluminum(4)-Vanadium at Room Temperature (Fatigue)
… alloy under investigation, Ti-6Al-4V, displays time dependent deformation at room temperature. This time dependent deformation and the resulting damage are incorporated into the existing framework of the fatigue life prediction methods based upon the local strain approach. This methodology has …
-
The Role of Water and Strain Rate in the Deformation of Limestone
… cause chemically-induced weakening and lead to time-dependent deformation in carbonate rocks. To quantify the effect of hydro-chemo-mechanical coupling on the deformation behavior and failure mode of carbonate rocks, limestone was deformed under both dry and water-saturated conditions. To …
-
Subcritical time-dependent response of Berea sandstone
… disturbances unfolds over extended periods, sometimes spanning months to years, giving rise to time-dependent deformation. Laboratory- and field-scale observations indicate that such time-dependent behavior can lead to significant changes in material properties, as well as the formation of micro- …
-
Influence of calcium-(alumino)-silicate-hydrate nanostructure on viscoelastic behavior
… multiple nanoindentation methods for the first time. In order to determine the effect of nanostructure on viscoelastic properties methods of data analysis that are independent of porosity were devised. Structure of the aluminosilicate chain and crystallinity of C-(A)-S-H with differing …
-
Mechanics of biomimetic materials for tissue engineering of the intervertebral disc
… tissue regeneration. These behaviours include time-dependent deformation---facilitating shock absorption and nutrient transfer---and strong material anisotropy and tensile-compressive nonlinearities---providing flexibility in controlled directions. In this work, frameworks for the design of …
-
An experimental investigation of the creep behavior of an underground coalmine roof with shale formation
… and return to the pre-mining stress state. Such deformation, if allowed to continue, will lead to failure of the strata, which creates an unsafe work environment. Therefore, supports are used to reinforce the deforming strata and help prevent any further deformation in the rock.;However, various …
-
The mechanical behaviour of soft clays under vibration loading from vehicle traffic
… important aspects of soft clay behaviour is the time dependent deformation characteristics. The behavioral characteristics of soft clays suggest that an overstress type soil model is suitable for the analysis of such deposits. A model initially proposed by P. Perzyna has been extended with the …
-
Coupled thermo-hydro-mechanical behavior of glacial tills in shallow geothermal systems
… geomaterials, where temperature gradients induce deformations, affect the pore pressure, and might significantly influence the pore fluid flow processes. The purpose of this work is to conduct a multi-physical analysis to characterize the coupled thermo-hydro-mechanical behavior of glacial tills …
-
Creep and Shrinkage of a High Strength Concrete Mixture
In addition to immediate elastic deformations, concrete undergoes time-dependent deformations that must be considered in design. Creep is defined as the time-dependent deformation resulting from a sustained stress. Shrinkage deformation is the time-dependent strain that occurs in the absence of an …
-
Compressive Creep of Prestressed Concrete Mixtures With and Without Mineral Admixtures
… experiences an instantaneous recoverable elastic deformation and a slow inelastic deformation called creep. Creep of concrete is composed of two components, basic creep, or deformation under load without moisture loss and drying creep, or deformation under drying conditions only. Deformation of …
-
Modelling of deep tunnel behaviour in clay
… i.e. a continually increasing volume loss with time, and possible collapse after a 'stand-up' time. A range of parameters likely to influence the time dependent deformation behaviour at an unsupported tunnel face was investigated in a number of small scale model tunnel tests. The tests were …
-
Creep and Shrinkage Effects on Steel-Concrete Composite Beams
… effects on the concrete deck varying over time. There are as yet no comprehensive ways for engineers to reliably deal with these issues, and the development of a set of justifiable numerical standards and equations for composite structures that goes beyond a simple commentary is well …
-
Time dependent mechanical behavior of mammalian collagen fibrils
… as similar quantitative understanding of the time-dependent deformation of individual collagen fibrils is missing, albeit essential for our understanding of the dissipative processes occurring in tissues and the development of microstructural, physics-based, models. This dissertation research …
-
Effect of CO2 injection on the poromechanical and multiphase flow characteristics of subsurface rock
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01