Phase-field simulations of multi-component solidification and coarsening based on thermodynamic datasets
Author: Schulz, Sebastian
Publisher: KIT Scientific Publishing
Published: 2017-02-22
Total Pages: 248
ISBN-13: 3731506181
DOWNLOAD EBOOK →Author: Schulz, Sebastian
Publisher: KIT Scientific Publishing
Published: 2017-02-22
Total Pages: 248
ISBN-13: 3731506181
DOWNLOAD EBOOK →Author: Sebastian Schulz
Publisher:
Published: 2020-10-09
Total Pages: 234
ISBN-13: 9781013281266
DOWNLOAD EBOOK →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. 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: Zhang, Tao
Publisher: KIT Scientific Publishing
Published: 2021-09-27
Total Pages: 224
ISBN-13: 3731510022
DOWNLOAD EBOOK →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: Mazzocchi, Francesco
Publisher: KIT Scientific Publishing
Published: 2022-07-01
Total Pages: 212
ISBN-13: 3731511819
DOWNLOAD EBOOK →This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
Author: Röhe, Maximilian
Publisher: KIT Scientific Publishing
Published: 2024-01-09
Total Pages: 178
ISBN-13: 3731512343
DOWNLOAD EBOOK →In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and structure-related inhomogeneities in electrolyte distribution. By means of the model it has been identified that mass transport of water and ions in the liquid phase is a crucial factor for electrode performance and how it is influenced by the electrode structure.
Author: Fett, Theo
Publisher: KIT Scientific Publishing
Published: 2022-07-11
Total Pages: 226
ISBN-13: 3731511592
DOWNLOAD EBOOK →Water diffusing into silica surfaces gives rise for several effects on diffusion behaviour and mechanical properties. In a preceding booklet, we focused on diffusion and fiber strengths and deformations which were obtained by water soaking under external loading. In the present booklet we deal with results and interpretations of strength increase in the absence of applied stresses.
Author: Fett, Theo
Publisher: KIT Scientific Publishing
Published: 2022-07-11
Total Pages: 226
ISBN-13: 3731511487
DOWNLOAD EBOOK →Water diffusing into silica surfaces gives rise for several effectson diffusion behaviour and mechanical properties. Water added to silica glass increases its specific volume so that the silica expands near the surface. Mechanical boundary conditions give rise for compressive “swelling stresses”. This fact provides a tool for the interpretation of many experimental observations from literature.
Author: Kumar, Amritesh
Publisher: KIT Scientific Publishing
Published: 2017-11-06
Total Pages: 160
ISBN-13: 3731506947
DOWNLOAD EBOOK →Author: Ganser, Markus
Publisher: KIT Scientific Publishing
Published: 2021-03-09
Total Pages: 272
ISBN-13: 3731510472
DOWNLOAD EBOOK →Solid state batteries with a lithium metal electrode are considered the next generation of high energy battery technology. Unfortunately, lithium metal is prone to harmful protrusion or dendrite growth which causes dangerous cell failure. Within this work the problem of protrusion growth is tackled by deriving a novel electro-chemo-mechanical theory tailored for binary solid state batteries which is then used to discuss the impact of mechanics on interface stability by numerical studies.
Author: Schöller, Lukas
Publisher: KIT Scientific Publishing
Published: 2024-03-15
Total Pages: 230
ISBN-13: 3731513404
DOWNLOAD EBOOK →During the production of fiber-reinforced thermosets, the resin material undergoes a reaction that can lead to damage. A two-stage polymerization reaction is modeled using molecular dynamics and evaluations of the system including a fiber surface are performed. In addition, a phase-field model for crack propagation in heterogeneous systems is derived. This model is able to predict crack growth where established models fail. Finally, the model is used to predict crack formation during curing.