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 32 for “"deformation temperature"”.
-
Some aspects of stability in thermoelasticity
… context of three theories of thermoelasticity: temperature-rate-dependent thermoelasticity TRDTE which was formulated by Green and Lindsay [21]; temperature-rate-dependent thermoelasticity with generalized thermoelasticity, which we label TRDTE + GTE (1), formulated by Chandrasekharaiah and …
-
Modellierung der Verfestigung technischer Aluminiumlegierungen
… of technical aluminium alloys as function of the deformation temperature and strain rate is described in two ways. First a phenomenological description is made using well known models from literature. For some specific cases the models are expanded. Furthermore a new model is developed which is …
-
Modellierung und Simulation des Warmumformverhaltens von hoch stickstofflegierten Stählen
… and tensile strength as well as improved high temperature strength. HNS show also a better corrosion resistance, pitting resistance and stress corrosion cracking resistance. However, these advantages are accompanied with some problems during hot deformation of HNS. Edges and surface cracks as …
-
Einfluss der Prozesskette auf die Feinkornbeständigkeit von mikrolegierten Einsatzstählen
… for cost savings. By increasing the carburising temperature from today approximately 940°C up to e.g. 1050°C significant process time reductions are achievable due to the acceleration of diffusion and absorption processes. While increasing the carburising temperature, the appearance of prohibited …
-
Efficient Thermo-Mechanical Model for Solidification Processes and Its Applications in Steel Continuous Casting
… is solved for the simultaneous evolution of deformation, temperature, and stress. Finally, a large scale 3D simulation of a thin slab caster with a funnel, first of that kind ever conducted, is performed to correctly reproduce the 3D mechanical state in casting process with extremely complex …
-
Vorticity of Flow, Deformation Temperatures, and Strain Symmetry of the Moine Thrust Zone, NW Scotland: Constraining the Kinematic and Thermal Evolution of a Collisional Orogenic System
Examination of deformation temperature, flow vorticity, and strain symmetry in the Loch Eriboll, Loch More, and Assynt regions of the Moine thrust zone (MTZ) in northwest Scotland allows quantitative kinematic and thermal characterization of a crustal-scale shear zone at the base of the Scandian …
-
Analysis of calcite-filled faults in carbonate strata, balcones trend near Waco, Texas.
… shear stress slightly more than 5-15 MPa, and deformation temperature of <170°C. The microspar fabric includes thin veinlets of secondary calcite and host lithons of cemented chalk wallrock whose orientation relative to the domain boundaries can be used as a shear-sense indicator.
-
Constitutive analysis and extrusion modeling of 6061 alloy and particulate composite
… The flow stresses decrease with increasing deformation temperature and the rate at which this occurs increases with percent reinforcement. Flow stress as a function of strain rate and temperature was suitably represented by the hyperbolic sine and Arrhenius equations for the alloy and metal …
-
Stress and strain rate estimates associated with penetrative deformation of the Harkless quartzite aureole rocks, Papoose Flat Pluton, California/Using structure contour maps to analyze subsurface 3D fault geometry along segments of the Moine Thrust
… rate estimates associated with penetrative deformation of rocks surrounding pluton margins. Microstructural analysis of the Harkless quartzites surrounding the western margin of Papoose Flat pluton indicates that recrystallization occurred by grain boundary migration with mean recrystallized …
-
Flow Properties of Moine Thrust Zone Mylonites in Northern Assynt, NW Scotland
… investigating the flow processes by which rock deformation occurred. These analytical techniques were applied to a suite of samples from the footwall and hangingwall of the Moine thrust exposed along the Allt Pol aâ Mhadaich stream located in the northern part of the Assynt window. Vorticity …
-
Effect of hot working characteristics on the texture development in AISI 430 and 433 ferritic stainless steel
… simulators to investigate the effect of temperature, strain rate and inter-pass time on the development of texture in these steel grades and its subsequent influence on ridging. The compression tests were carried out over a wide range of strain rates (0.1 s-1 to 5 s-1, 25 s-1 and 50 s-1) …
-
Atomistic Molecular Dynamics Studies of Grain Boundary Structure and Deformation Response in Metallic Nanostructures
… how local grain boundary structure affects deformation behavior through the quantitative estimation of various plasticity mechanisms, such as dislocation emission and grain boundary sliding. The effects of strain rate and temperature on the plastic deformation process were also investigated. …
-
Determination of thermo-mechanical variables during plain strain compression testing
… (PSC) resting is a method used to simulate the deformation condition of industrial rolling, namely that of plane strain, and is used extensively to describe the influence of deformation variables, being strain, strain rate and temperature, on microstructural evolution. However, the strain and …
-
Modeling piston secondary motion and skirt lubrication with applications
… has been focused on introducing liner dynamic deformation, temperature and shear-thinning effect on viscosity, and arbitrary skirt's shape definition. The theory behind the inclusion of these components is discussed and the modifications to the existing model are explained. In regards to the …
-
Mechanisms of Deformation and Fracture in TiAl: An Atomistic Simulation Study
… and aeronautic industries, where, at certain temperatures, they might be capable of replacing heavy nickel-based superalloys. However, so far applications of TiAl alloys have been limited by their poor ductility. Many of the recent studies have focused on the source of this limited ductility …
-
Microstructure Dual-Refinement and Mechanical Properties Manipulation of TiBw/TA15(Si) Composites by Thermo-mechanical Processing and Heat Treatment
… exhibit high specific strength and good high-temperature strength. However, the thermo-mechanical processing is limited by the brittleness of the reinforcement, making it difficult to refine the grain size and control the silicide precipitates. The present work aims to prepare titanium matrix …
-
Hot deformation behaviour of SiCp/Al composites and their matrices and an Al-Mg-Si alloy
… stresses decrease monotonically with increasing deformation temperature (T), following the same relationship as the published data. At very high temperatures, $\sigma$ is similar for all materials but as T falls to 300$\sp\circ$C, the A356 rises more rapidly than 6061. Flow stresses for the …
-
Multiblock Thermoplastic Polyurethanes For Biomedical and Shape Memory Applications
… one minute when heating above the transition temperature. Instead of conventional "hard" blocks, entanglements, which result from high molecular weight, served as the physical crosslinks in this system, engendering shape recovery and preventing flow. Moreover, water-triggered shape memory …
-
Investigation of rolling variables on the structure of steel.
… research has been critically reviewed. Hot deformation of Nb-free and Nb-containing stainless and C-Mn steels has been carried out by: upset-forging, rolling, and plane strain compression testing. Also, some gridded lead alloy and some mild steel containing Type I MnS inclusions as markers …
-
Microstructure and texture development during high-strain torsion of NiAl
… NiAl has been subjected to torsion deformation. Torsion has been used because of its characteristics. By this deformation mode high shear strains (gamma = 18 in this study) can be imposed on the sample. The deformation conditions are well-defined because of the local deformation …
Page 1 of 2