Microstructural Modeling And Computational Homogenization Of The Physically Linear And Nonlinear Constitutive Behavior Of Micro Heterogeneous Materials
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Author |
: Felix Fritzen |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 190 |
Release |
: 2014-08-22 |
ISBN-10 |
: 9783866446991 |
ISBN-13 |
: 3866446993 |
Rating |
: 4/5 (91 Downloads) |
Synopsis Microstructural Modeling and Computational Homogenization of the Physically Linear and Nonlinear Constitutive Behavior of Micro-heterogeneous Materials by : Felix Fritzen
Engineering materials show a pronounced heterogeneity on a smaller scale that influences the macroscopic constitutive behavior. Algorithms for the periodic discretization of microstructures are presented. These are used within the Nonuniform Transformation Field Analysis (NTFA) which is an order reduction based nonlinear homogenization method with micro-mechanical background. Theoretical and numerical aspects of the method are discussed and its computational efficiency is validated.
Author |
: Felix Fritzen |
Publisher |
: |
Total Pages |
: 0 |
Release |
: 2011 |
ISBN-10 |
: OCLC:1189902677 |
ISBN-13 |
: |
Rating |
: 4/5 (77 Downloads) |
Synopsis Microstructural Modeling and Computational Homogenization of the Physically Linear and Nonlinear Constitutive Behavior of Micro-heterogeneous Materials by : Felix Fritzen
Author |
: Görthofer, Johannes |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 258 |
Release |
: 2022-09-13 |
ISBN-10 |
: 9783731512059 |
ISBN-13 |
: 373151205X |
Rating |
: 4/5 (59 Downloads) |
Synopsis Microstructure generation and micromechanical modeling of sheet molding compound composites by : Görthofer, Johannes
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 |
ISBN-10 |
: 9783731512202 |
ISBN-13 |
: 3731512203 |
Rating |
: 4/5 (02 Downloads) |
Synopsis Efficient fast Fourier transform-based solvers for computing the thermomechanical behavior of applied materials by : Wicht, Daniel
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 |
: Hölz, Peter |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 294 |
Release |
: 2020-07-08 |
ISBN-10 |
: 9783731509882 |
ISBN-13 |
: 3731509881 |
Rating |
: 4/5 (82 Downloads) |
Synopsis A dynamic and statistical analysis of the temperature- and fatigue behavior of a race power unit – The effect of different thermodynamic states by : Hölz, Peter
Author |
: Kehrer, Maria Loredana |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 204 |
Release |
: 2019-06-13 |
ISBN-10 |
: 9783731509240 |
ISBN-13 |
: 3731509245 |
Rating |
: 4/5 (40 Downloads) |
Synopsis Thermomechanical Mean-Field Modeling and Experimental Characterization of Long Fiber-Reinforced Sheet Molding Compound Composites by : Kehrer, Maria Loredana
A discontinuous fiber-reinforced thermoset material produced by the Sheet Molding Compound process is investigated. Due to the process-related fiber orientation distribution, a composite with an anisotropic microstructure is created which crucially affects the mechanical properties. The central objectives are the modeling of the thermoelastic behavior of the composite accounting for the underlying microstructure, and the experimental characterization of the pure resin and the composite material.
Author |
: Erdle, Hannes |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 184 |
Release |
: 2022-07-12 |
ISBN-10 |
: 9783731511960 |
ISBN-13 |
: 3731511967 |
Rating |
: 4/5 (60 Downloads) |
Synopsis Modeling of Dislocation - Grain Boundary Interactions in Gradient Crystal Plasticity Theories by : Erdle, Hannes
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 |
: Ruck, Johannes |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 220 |
Release |
: 2021-05-07 |
ISBN-10 |
: 9783731510727 |
ISBN-13 |
: 3731510723 |
Rating |
: 4/5 (27 Downloads) |
Synopsis Modeling martensitic phase transformation in dual phase steels based on a sharp interface theory by : Ruck, Johannes
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 |
: Neumann, Rudolf |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 270 |
Release |
: 2017-10-27 |
ISBN-10 |
: 9783731507147 |
ISBN-13 |
: 3731507145 |
Rating |
: 4/5 (47 Downloads) |
Synopsis Two-Scale Thermomechanical Simulation of Hot Stamping by : Neumann, Rudolf
Hot stamping is a hot drawing process which takes advantage of the polymorphic steel behavior to produce parts with a good strength-to-weight ratio. For the simulation of the hot stamping process, a nonlinear two-scale thermomechanical model is suggested and implemented into the FE tool ABAQUS. Phase transformation and transformation induced plasticity effects are taken into account. The simulation results regarding the final shape and residual stresses are compared to experimental findings.
Author |
: Prahs, Andreas |
Publisher |
: KIT Scientific Publishing |
Total Pages |
: 182 |
Release |
: 2020-09-15 |
ISBN-10 |
: 9783731510253 |
ISBN-13 |
: 3731510251 |
Rating |
: 4/5 (53 Downloads) |
Synopsis A Gradient Crystal Plasticity Theory Based on an Extended Energy Balance by : Prahs, Andreas
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.