Modeling Martensitic Phase Transformation In Dual Phase Steels Based On A Sharp Interface Theory
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| Author | : Ruck, Johannes |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 220 |
| Release | : 2021-05-07 |
| Genre | : Technology & Engineering |
| ISBN | : 3731510723 |
artensite forms under rapid cooling of austenitic grains accompanied by a change of the crystal lattice. Large deformations are induced which lead to plastic dislocations. In this work a transformation model based on the sharp interface theory, set in a finite strain context is developed. Crystal plasticity effects, the kinetic of the singular surface as well as a simple model of the inheritance from austenite dislocations into martensite are accounted for.
| Author | : Erdle, Hannes |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 184 |
| Release | : 2022-07-12 |
| Genre | : Technology & Engineering |
| ISBN | : 3731511967 |
A physically-based dislocation theory of plasticity is derived within an extended continuum mechanical context. Thermodynamically consistent flow rules at the grain boundaries are derived. With an analytical solution of a three-phase periodic laminate, dislocation pile-up at grain boundaries and dislocation transmission through the grain boundaries are investigated. For the finite element implementations, numerically efficient approaches are introduced based on accumulated field variables.
| Author | : Lang, Juliane |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 250 |
| Release | : 2023-06-28 |
| Genre | : |
| ISBN | : 3731512327 |
The aim of this work is to model and experimentally characterize the anisotropic material behavior of SMC composites on the macroscale with consideration of the microstructure. Temperature-dependent thermoelastic behavior and failure behavior are modeled and the corresponding material properties are determined experimentally. Additionally, experimental biaxial damage investigations are performed. A parameter identification merges modeling and experiments and validates the models.
| Author | : Kuhn, Jannick |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 224 |
| Release | : 2023-04-04 |
| Genre | : Technology & Engineering |
| ISBN | : 3731512726 |
Computational homogenization permits to capture the influence of the microstructure on the cyclic mechanical behavior of polycrystalline metals. In this work we investigate methods to compute Laguerre tessellations as computational cells of polycrystalline microstructures, propose a new method to assign crystallographic orientations to the Laguerre cells and use Bayesian optimization to find suitable parameters for the underlying micromechanical model from macroscopic experiments.
| Author | : Görthofer, Johannes |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 258 |
| Release | : 2022-09-13 |
| Genre | : Technology & Engineering |
| ISBN | : 373151205X |
Wir präsentieren einen Algorithmus zur schnellen Erzeugung von SMC Mikrostrukturen hoher Güte, durch Verwendung einer exakten Schließung und eines quasi-zufälligen Samplings. Darüber hinaus stellen wir ein modulares Framework zur Modellierung anisotroper Schädigung vor. Unser Konzept der Extraktionstensoren und Schädigungsfunktionen ermöglicht die Beschreibung komplexer Vorgänge. Darüber hinaus schlagen wir einen ganzheitlichen Multiskalenansatz zur Bestimmung anisotroper Versagenskriterien vor. - We introduce an algorithm that allows for a fast generation of SMC composite microstructures. An exact closure approximation and a quasi-random orientation sampling ensure high fidelity. Furthermore, we present a modular framework for anisotropic damage evolution. Our concept of extraction tensors and damage-hardening functions enables the description of complex damage-degradation. In addition, we propose a holistic multiscale approach for constructing anisotropic failure criteria.
| Author | : Wicht, Daniel |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 336 |
| Release | : 2022-10-11 |
| Genre | : Science |
| ISBN | : 3731512203 |
The mechanical behavior of many applied materials arises from their microstructure. Thus, to aid the design, development and industrialization of new materials, robust computational homogenization methods are indispensable. The present thesis is devoted to investigating and developing FFT-based micromechanics solvers for efficiently computing the (thermo)mechanical response of nonlinear composite materials with complex microstructures.
| Author | : Gajek, Sebastian |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 326 |
| Release | : 2023-08-25 |
| Genre | : |
| ISBN | : 3731512785 |
We investigate deep material networks (DMN). We lay the mathematical foundation of DMNs and present a novel DMN formulation, which is characterized by a reduced number of degrees of freedom. We present a efficient solution technique for nonlinear DMNs to accelerate complex two-scale simulations with minimal computational effort. A new interpolation technique is presented enabling the consideration of fluctuating microstructure characteristics in macroscopic simulations.
| Author | : Ernesti, Felix |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 264 |
| Release | : 2023-04-17 |
| Genre | : Technology & Engineering |
| ISBN | : 3731512858 |
Materials of industrial interest often show a complex microstructure which directly influences their macroscopic material behavior. For simulations on the component scale, multi-scale methods may exploit this microstructural information. This work is devoted to a multi-scale approach for brittle materials. Based on a homogenization result for free discontinuity problems, we present FFT-based methods to compute the effective crack energy of heterogeneous materials with complex microstructures.
| Author | : Bauer, Julian Karl |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 252 |
| Release | : 2023-02-27 |
| Genre | : Technology & Engineering |
| ISBN | : 3731512629 |
Effective mechanical properties of fiber-reinforced composites strongly depend on the microstructure, including the fibers' orientation. Studying this dependency, we identify the variety of fiber orientation tensors up to fourth-order using irreducible tensors and material symmetry. The case of planar fiber orientation tensors, relevant for sheet molding compound, is presented completely. Consequences for the reconstruction of fiber distributions and mean field homogenization are presented.
| Author | : Robert William Kerr Honeycombe |
| Publisher | : John Wiley & Sons |
| Total Pages | : 340 |
| Release | : 1996-02-12 |
| Genre | : Technology & Engineering |
| ISBN | : |
The properties of steels depend critically on their microstructure. By examining the mechanical properties of steels in conjunction with microstructure, the first edition gave a clear description of the development and behavior of these materials - the very foundation of their widespread use. This new edition more explicitly links this theory with applications while retaining the style and purpose of its predecessor.
