Micromechanical study on the deformation behaviour of directionally solidified NiAl-Cr eutectic composites
| Author | : Kumar, Amritesh |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 160 |
| Release | : 2017-11-06 |
| Genre | : |
| ISBN | : 3731506947 |
Micromechanical Study On The Deformation Behaviour Of Directionally Solidified Nial Cr Eutectic Composites
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Deformation and Fracture Properties of the Soft Magnetic Composite Somaloy 700 3P on Different Length Scales
| Author | : Schwark, Tabea Gisela |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 178 |
| Release | : 2018-07-09 |
| Genre | : Grinding and polishing |
| ISBN | : 3731507595 |
Soft Magnetic Composites (SMCs) typically consist of large iron particles coated with a fairly thin inorganic layer. The combination of soft particles with a brittle layer causes, however, a rather poor mechanical behaviour of the SMCs. The particle boundaries of the specific SMC Somaloy 700 3P can be classified into four different types according to the complexity of their layers. Tests on both micro- and macroscale showed that the particle-boundary interface is critical in terms of failure.
Characterisation and Modelling of Continuous-Discontinuous Sheet Moulding Compound Composites for Structural Applications
| Author | : Trauth, Anna |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 468 |
| Release | : 2020-12-11 |
| Genre | : Technology & Engineering |
| ISBN | : 3731509504 |
The main objective of this work is to significantly deepen the understanding of the material and the structural behaviour of continuous-discontinuous SMC composites, following a holistic approach to investigate microscopic aspects, macroscopic mechanical behaviour as well as failure evolution at the coupon, structure and component level. In addition, criteria to evaluate the effect of hybridisation are introduced and modelling approaches are presented and discussed.
The Impact of Recycling on the Fibre and the Composite Properties of Carbon Fibre Reinforced Plastics
| Author | : Hüther, Jonas Johannes |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 360 |
| Release | : 2020-06-19 |
| Genre | : Technology & Engineering |
| ISBN | : 3731509830 |
Influence of strain on the functionality of ink-jet printed thin films and devices on flexible substrates
| Author | : Mishra, Nilesha |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 156 |
| Release | : 2019-02-15 |
| Genre | : Capacitors |
| ISBN | : 3731508532 |
Ink-jet printed devices on the flexible substrate are inexpensive and large area compatible as compared to rigid substrates. However, during fabrication and service they are subjected to complex strains, resulting in crack formation or delamination within the layers, affecting the device performance. Therefore, it is necessary to understand their failure mechanisms by correlating their electrical or structural properties with applied strain, supported by detailed microstructural investigations.
Structure evolution in tribological interfaces studied by multilayer model alloys
| Author | : Cihan, Ebru |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 194 |
| Release | : 2020-10-21 |
| Genre | : 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.
On the Electro-Chemo-Mechanical Coupling in Solid State Batteries and its Impact on Morphological Interface Stability
| Author | : Ganser, Markus |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 272 |
| Release | : 2021-03-09 |
| Genre | : Technology & Engineering |
| ISBN | : 3731510472 |
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.
Phase-field Modeling of Phase Changes and Mechanical Stresses in Electrode Particles of Secondary Batteries
| Author | : Zhang, Tao |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 224 |
| Release | : 2021-09-27 |
| Genre | : 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.
Application of Data Mining and Machine Learning Methods to Industrial Heat Treatment Processes for Hardness Prediction
| Author | : Lingelbach, Yannick |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 278 |
| Release | : 2024-07-24 |
| Genre | : |
| ISBN | : 3731513528 |
This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework. - This work presents a data mining framework applied to industrial heattreatment (bainitization and case hardening) aiming to optimize processes and reduce costs. The framework analyses factors such as material, production line, and quality assessment for preprocessing, feature extraction, and drift corrections. Machine learning is employed to devise robust prediction strategies for hardness. Its implementation in an industry pilot demonstrates the economic benefits of the framework.
Consequences of hydroxyl generation by the silica/water reaction - Part I: Diffusion and Swelling
| Author | : Fett, Theo |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 226 |
| Release | : 2022-07-11 |
| Genre | : Science |
| ISBN | : 3731511487 |
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.
