Author : Albiez, Jürgen
Publisher : KIT Scientific Publishing
Page : 222 pages
File Size : 13,76 MB
Release : 2019-05-22
Category : Technology & Engineering
ISBN : 3731509180
A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced.
Author : Jürgen Albiez
Publisher :
Page : 214 pages
File Size : 15,9 MB
Release : 2020-10-09
Category : Technology & Engineering
ISBN : 9781013282959
A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced. 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.
Author : Erdle, Hannes
Publisher : KIT Scientific Publishing
Page : 184 pages
File Size : 36,10 MB
Release : 2022-07-12
Category : 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 : Prahs, Andreas
Publisher : KIT Scientific Publishing
Page : 182 pages
File Size : 32,1 MB
Release : 2020-09-15
Category : 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
Page : 224 pages
File Size : 41,47 MB
Release : 2023-04-04
Category : 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 : Hölz, Peter
Publisher : KIT Scientific Publishing
Page : 294 pages
File Size : 48,28 MB
Release : 2020-07-08
Category : Technology & Engineering
ISBN : 3731509881
Author : Ruck, Johannes
Publisher : KIT Scientific Publishing
Page : 220 pages
File Size : 35,30 MB
Release : 2021-05-07
Category : 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 : Gajek, Sebastian
Publisher : KIT Scientific Publishing
Page : 326 pages
File Size : 28,17 MB
Release : 2023-08-25
Category :
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
Page : 264 pages
File Size : 42,92 MB
Release : 2023-04-17
Category : 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 : Wicht, Daniel
Publisher : KIT Scientific Publishing
Page : 336 pages
File Size : 46,76 MB
Release : 2022-10-11
Category : 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.
