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 12 of 12 for “"Dynamic recovery"”.
-
Mathematical Modeling and Dynamic Recovery of Power Systems
Power networks are sophisticated dynamical systems whose stable operation is essential to modern society. We study the swing equation for networks and its linearization (LSEN) as a tool for modeling power systems. Nowadays, phasor measurement units (PMUs) are used across power networks to measure …
-
The hot working characteristics of Al-0.65% Fe, and Al-0.5% Fe-0.5% Co conductor alloys
… strain to steady state and hence the level of dynamic recovery. In interrupted testing, fractional softening increased with rise in temperature or hold time, or decline in strain rate. With repeated passes, the strength of the alloys declined substantially compared to continuous testing.
-
Aspects of serrated flow in aluminium alloys
… evolution of related deformation structures in dynamic experiments in a high voltage transmission electron microscope (HVEM). In addition, the formation of slip lines on the surface of the HVEM microtensile specimens compared favourably with those formed on the surfaces of macroscopic tensile …
-
Modeling and Simulation of Viscoplasticity, Recrystallization, and Softening of Alloyed Steel During Hot Rolling Process
… of this study is to investigate viscoplasticity, dynamic recrystallization, and static softening of alloyed metal during hot rolling process. Gleeble hot compression tests were performed to provide experimental stress-strain curves at different temperatures and strain rates. An inverse finite …
-
BULK NANOSTRUCTURED STEELS FOR NUCLEAR REACTOR AND EXTREME ENVIRONMENT APPLICATIONS
… strengthening, and dislocation strengthening. Dynamic recovery was promoted due to ECAP at 520 oC rendering it with a large area fraction of less mobile low angle grain boundaries (LAGBs) which thermally stabilized it up to 500 C, well above the operating temperature of an LWR. FeCrAl alloys …
-
Multiscale In-Situ Characterization of Crystal Orientation, Temperature, and Microstructure Effects on Creep Defromation of Pure Magnesium and Mg-Al-RE Alloys
… glide, while higher temperatures promote dynamic recovery. The final part studies high pressure die cast (HPDC) AE44 alloys (AE44-2 and AE44-4). Results reveal that β-phase morphology enhances creep resistance by obstructing dislocation glide and grain boundary sliding. A Hall-Petch-like …
-
Effect of hot working characteristics on the texture development in AISI 430 and 433 ferritic stainless steel
… 20 s and 30 s). The transition temperature from dynamic recrystallization (which may introduce a texture change) to dynamic recovery (in which no texture changes are expected) was determined by examining the relationship between the mean flow stress and the deformation temperature in multi-pass …
-
Stress-induced Damage and Post-fire Response of Aluminum Alloys
… damage primarily manifests itself as dynamic recovery at low creep temperatures, while cavitation, dynamic recrystallization and dynamic precipitation (in Al6061) are the types of damage developed in the high creep strains at high exposure temperatures. Different creep mechanisms are …
-
Microstructure-based Constitutive Models for Residual Mechanical Behavior of Aluminum Alloys after Fire Exposure
… considering the microstructural processes of recovery and recrystallization. The residual yield strength was calculated considering solid solution, subgrain, and grain strengthening. A recovery model was used to predict subgrain growth and a recrystallization model was used to predict grain …
-
Effects of Isolated Core Stability Training on Standing Static Postural Control, Recovery of Standing Postural Control and Kicking Velocity in Soccer Athletes
… program on trunk muscle activation, static and dynamic postural stability and kicking velocity in soccer athletes. <strong>DESIGN</strong>: Twenty division II and III soccer athletes (n=10 male, n=10 female) participated in a quasi-experimental randomized pre-post training study (n=10 control, …
-
Microstructural evolution during hot deformation of the 6061 aluminium alloy based Al₂O₃ metal matrix composites
… was investigated by optical metallography. Recovery behavior of the 6061 and the composites was very similar while recrystallization behavor differed markedly. Only up to 5% fraction recrystallized was observed in the 6061 material deformed at temperatures above 723 K and annealed at the …
-
CLIMATE RESILIENCE OF CRITICAL INFRASTRUCTURE: Network Modelling for Flood Resilience Assessment and Recovery Optimisation of Urban Rail Transit
… advances network modelling to capture the dynamic service delivery of URTSs at the disruption moment and during recovery. It begins by generating service disruption scenarios through the identification of flooded stations and tracks that would become non-functional in the event of flooding. …