Author : Syha, Melanie
Publisher : KIT Scientific Publishing
Page : 178 pages
File Size : 49,62 MB
Release : 2014-09-25
Category : Science
ISBN : 3731502429
Understanding the physical processes during fabrication and annealing of ceramic materials is a long sought goal among material scientists. Using strontium titanate as a model system for perovskite ceramics, the present work combines advanced non-destructive 3D characterization techniques and computational modeling of microstructure evolution in order to link grain morphology, interface anisotropy and microstructure evolution to macroscopic physical properties .
Author : Melanie Syha
Publisher :
Page : 168 pages
File Size : 15,10 MB
Release : 2020-10-09
Category : Science
ISBN : 9781013280245
Understanding the physical processes during fabrication and annealing of ceramic materials is a long sought goal among material scientists. Using strontium titanate as a model system for perovskite ceramics, the present work combines advanced non-destructive 3D characterization techniques and computational modeling of microstructure evolution in order to link grain morphology, interface anisotropy and microstructure evolution to macroscopic physical properties . This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author : Vondrous, Alexander
Publisher : KIT Scientific Publishing
Page : 162 pages
File Size : 15,70 MB
Release : 2014-12-15
Category : Technology (General)
ISBN : 3731502801
This book summarizes the found insights of grain growth behavior, of multidimensional decomposition for regular grids to efficiently parallelize computing and how to simulate recrystallization by coupling the finite element method with the phase-field method for microstructure texture analysis. The frame of the book is created by the phase-field method, which is the tool used in this work, to investigate microstructure phenomena.
Author : Straub, Thomas
Publisher : KIT Scientific Publishing
Page : 234 pages
File Size : 26,19 MB
Release : 2016
Category : Technology (General)
ISBN : 3731504715
This book investigates the fatigue mechanisms and crack initiation of Ni, Al and Cu on a small-scale in the Very High Cycle Fatigue regime by means of innovative fatigue experimentation. A novel custom-built resonant fatigue setup showed that the sample resonant frequency changes with increasing cycle number due to fatigue damage. Mechanisms such as slip band formation have been observed. Cyclic hardening, vacancy and oxidation formation may be considered as early fatigue mechanisms.
Author : Ankit, Kumar
Publisher : KIT Scientific Publishing
Page : 240 pages
File Size : 25,20 MB
Release : 2016-05-31
Category : Technology (General)
ISBN : 373150491X
With the advent of high performance computing, the application areas of the phase-field method, traditionally used to numerically model the phase transformation in metals and alloys, have now spanned into geoscience. A systematic investigation of the two distinct scientific problems in consideration suggest a strong influence of interfacial energy on the natural and induced pattern formation in diffusion-controlled regime.
Author : Cihan, Ebru
Publisher : KIT Scientific Publishing
Page : 194 pages
File Size : 37,63 MB
Release : 2020-10-21
Category : Technology & Engineering
ISBN : 3731509997
Recent studies of deformation mechanisms of metals and alloys pioneer the better investigation of the friction and wear behavior of materials with well-defined initial microstructures. Within this scope, in this work, the effect of sub-surface deformations on the resulting friction and wear behavior has been searched by means of a systematic experimental study on Au-Ni metallic multilayer model alloy system.
Author : Feuchter, Manuel Klaus Ludwig
Publisher : KIT Scientific Publishing
Page : 258 pages
File Size : 16,29 MB
Release : 2014-10-01
Category : Technology & Engineering
ISBN : 3731502615
This work furthers the overall understanding of a 3w-measurement, by considering previously unexamined macroscopic influence factors within measurement by Finite Element simulations (FES). Moreover, new measuring configurations are developed to determine (an)isotropic thermal conductivities of nanoscale samples. Since no analytic solutions are available for these configurations, a new evaluation methodology is presented to determine emergent thermal conductivities by FES and Neural Networks.
Author : Schulz, Sebastian
Publisher : KIT Scientific Publishing
Page : 246 pages
File Size : 42,59 MB
Release : 2017-02-22
Category : Aluminum
ISBN : 3731506181
The utilization of thermodynamic and mobility data plays a major role in phase-field modeling. This work discusses different formulations for the thermodynamic quantities of a grand potential model along with practices to determine parameters from datasets. The framework is used to study solidification of Al-Si-Mg for a variation of composition, diffusivities and surface energy anisotropies. To verify the simulations, they are compared with solidification theories.
Author : Zhang, Tao
Publisher : KIT Scientific Publishing
Page : 224 pages
File Size : 46,45 MB
Release : 2021-09-27
Category : Technology & Engineering
ISBN : 3731510022
Most storage materials exhibit phase changes, which cause stresses and, thus, lead to damage of the electrode particles. In this work, a phase-field model for the cathode material NaxFePO4 of Na-ion batteries is studied to understand phase changes and stress evolution. Furthermore, we study the particle size and SOC dependent miscibility gap of the nanoscale insertion materials. Finally, we introduce the nonlocal species concentration theory, and show how the nonlocality influences the results.
Author : Birkholz, Oleg
Publisher : KIT Scientific Publishing
Page : 246 pages
File Size : 14,85 MB
Release : 2022-10-05
Category : Science
ISBN : 373151172X
Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of cathode structures on the performance of the whole cell, efficient tools for calculating effective transport properties of granular systems are developed and their influence on the electrochemical performance is investigated in specially adapted cell models.
