Modeling Of Dislocation Grain Boundary Interactions In Gradient Crystal Plasticity Theories
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| 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 | : Franz Roters |
| Publisher | : John Wiley & Sons |
| Total Pages | : 188 |
| Release | : 2011-08-04 |
| Genre | : Technology & Engineering |
| ISBN | : 3527642099 |
Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
| Author | : Eric Bayerschen |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 278 |
| Release | : 2016 |
| Genre | : Technology (General) |
| ISBN | : 3731506068 |
In experiments on metallic microwires, size effects occur as a result of the interaction of dislocations with, e.g., grain boundaries. In continuum theories this behavior can be approximated using gradient plasticity. A numerically efficient geometrically linear gradient plasticity theory is developed considering the grain boundaries and implemented with finite elements. Simulations are performed for several metals in comparison to experiments and discrete dislocation dynamics simulations.
| Author | : Prahs, Andreas |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 182 |
| Release | : 2020-09-15 |
| Genre | : Technology & Engineering |
| ISBN | : 3731510251 |
An overview of different methods for the derivation of extended continuum models is given. A gradient plasticity theory is established in the context of small deformations and single slip by considering the invariance of an extended energy balance with respect to Euclidean transformations, where the plastic slip is considered as an additional degree of freedom. Thermodynamically consistent flow rules at the grain boundary are derived. The theory is applied to a two- and a three-phase laminate.
| 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 | : Dierk Raabe |
| Publisher | : Wiley-VCH |
| Total Pages | : 408 |
| Release | : 1998-10-27 |
| Genre | : Computers |
| ISBN | : |
Modeling and simulation play an ever increasing role in the development and optimization of materials. Computational Materials Science presents the most important approaches in this new interdisciplinary field of materials science and engineering. The reader will learn to assess which numerical method is appropriate for performing simulations at the various microstructural levels and how they can be coupled. This book addresses graduate students and professionals in materials science and engineering as well as materials-oriented physicists and mechanical engineers.
| 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 | : 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 | : Holm Altenbach |
| Publisher | : Springer Nature |
| Total Pages | : 530 |
| Release | : 2019-10-23 |
| Genre | : Technology & Engineering |
| ISBN | : 3030303551 |
This special anniversary book celebrates the success of this Springer book series highlighting materials modeling as the key to developing new engineering products and applications. In this 100th volume of “Advanced Structured Materials”, international experts showcase the current state of the art and future trends in materials modeling, which is essential in order to fulfill the demanding requirements of next-generation engineering tasks.
| 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.
