Influence of strain on the functionality of ink-jet printed thin films and devices on flexible substrates
Influence of strain on the functionality of ink-jet printed thin films and devices on flexible substrates

Author: Mishra, Nilesha

Publisher: KIT Scientific Publishing

Published: 2019-02-15

Total Pages: 156

ISBN-13: 3731508532

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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.

Influence of Strain on the Functionality of Ink-jet Printed Thin Films and Devices on Flexible Substrates
Influence of Strain on the Functionality of Ink-jet Printed Thin Films and Devices on Flexible Substrates

Author: Nilesha Mishra

Publisher:

Published: 2020-10-09

Total Pages: 142

ISBN-13: 9781013282157

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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. 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.

Development of NbN based Kinetic Inductance Detectors on sapphire and diamond substrates for fusion plasma polarimetric diagnostics
Development of NbN based Kinetic Inductance Detectors on sapphire and diamond substrates for fusion plasma polarimetric diagnostics

Author: Mazzocchi, Francesco

Publisher: KIT Scientific Publishing

Published: 2022-07-01

Total Pages: 212

ISBN-13: 3731511819

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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.

On the Electro-Chemo-Mechanical Coupling in Solid State Batteries and its Impact on Morphological Interface Stability
On the Electro-Chemo-Mechanical Coupling in Solid State Batteries and its Impact on Morphological Interface Stability

Author: Ganser, Markus

Publisher: KIT Scientific Publishing

Published: 2021-03-09

Total Pages: 272

ISBN-13: 3731510472

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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.

Consequences of hydroxyl generation by the silica/water reaction - Part I: Diffusion and Swelling
Consequences of hydroxyl generation by the silica/water reaction - Part I: Diffusion and Swelling

Author: Fett, Theo

Publisher: KIT Scientific Publishing

Published: 2022-07-11

Total Pages: 226

ISBN-13: 3731511487

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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.

Consequences of hydroxyl generation by the silica/water reaction - Part II: Global and local Swelling - Part III: Damage and Young's Modulus
Consequences of hydroxyl generation by the silica/water reaction - Part II: Global and local Swelling - Part III: Damage and Young's Modulus

Author: Fett, Theo

Publisher: KIT Scientific Publishing

Published: 2022-07-11

Total Pages: 226

ISBN-13: 3731511592

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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.

Multiscale Modeling of Curing and Crack Propagation in Fiber-Reinforced Thermosets
Multiscale Modeling of Curing and Crack Propagation in Fiber-Reinforced Thermosets

Author: Schöller, Lukas

Publisher: KIT Scientific Publishing

Published: 2024-03-15

Total Pages: 230

ISBN-13: 3731513404

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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.

Characterisation and Modelling of Continuous-Discontinuous Sheet Moulding Compound Composites for Structural Applications
Characterisation and Modelling of Continuous-Discontinuous Sheet Moulding Compound Composites for Structural Applications

Author: Trauth, Anna

Publisher: KIT Scientific Publishing

Published: 2020-12-11

Total Pages: 468

ISBN-13: 3731509504

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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.

Modeling transport properties and electrochemical performance of hierarchically structured lithium-ion battery cathodes using resistor networks and mathematical half-cell models
Modeling transport properties and electrochemical performance of hierarchically structured lithium-ion battery cathodes using resistor networks and mathematical half-cell models

Author: Birkholz, Oleg

Publisher: KIT Scientific Publishing

Published: 2022-10-05

Total Pages: 246

ISBN-13: 373151172X

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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.