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Author : Wulfinghoff, Stephan
Publisher : KIT Scientific Publishing
Page : 290 pages
File Size : 47,8 Mb
Release : 2014-12-10
Category : Electronic
ISBN : 9783731502456
Author : Stephan Wulfinghoff
Publisher : Unknown
Page : 282 pages
File Size : 41,5 Mb
Release : 2020-10-09
Category : Science
ISBN : 1013280350
This book is a contribution to the further development of gradient plasticity. Several open questions are addressed, where the efficient numerical implementation is particularly focused on. Thebook inspects an equivalent plastic strain gradient plasticity theory and a grain boundary yield model. Experiments can successfully be reproduced. The hardening model is based on dislocation densities evolving according to partial differential equations taking into account dislocation transport. 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 : Eric Bayerschen
Publisher : KIT Scientific Publishing
Page : 278 pages
File Size : 48,5 Mb
Release : 2016-12-29
Category : Electronic
ISBN : 9783731506065
Author : Prahs, Andreas
Publisher : KIT Scientific Publishing
Page : 182 pages
File Size : 51,8 Mb
Release : 2020-09-15
Category : Technology & Engineering
ISBN : 9783731510253
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 : Gajek, Sebastian
Publisher : KIT Scientific Publishing
Page : 326 pages
File Size : 51,7 Mb
Release : 2023-08-25
Category : Electronic
ISBN : 9783731512783
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 : Neumann, Rudolf
Publisher : KIT Scientific Publishing
Page : 270 pages
File Size : 55,6 Mb
Release : 2017-10-27
Category : Electronic
ISBN : 9783731507147
Author : Lang, Juliane
Publisher : KIT Scientific Publishing
Page : 250 pages
File Size : 45,7 Mb
Release : 2023-06-28
Category : Electronic
ISBN : 9783731512325
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 : Ernesti, Felix
Publisher : KIT Scientific Publishing
Page : 264 pages
File Size : 45,8 Mb
Release : 2023-04-17
Category : Technology & Engineering
ISBN : 9783731512851
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 : Schemmann, Malte
Publisher : KIT Scientific Publishing
Page : 194 pages
File Size : 41,7 Mb
Release : 2018-11-09
Category : Electronic
ISBN : 9783731508182
Author : Erdle, Hannes
Publisher : KIT Scientific Publishing
Page : 184 pages
File Size : 48,6 Mb
Release : 2022-07-12
Category : Technology & Engineering
ISBN : 9783731511960
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 : Mueller, Viktor
Publisher : KIT Scientific Publishing
Page : 168 pages
File Size : 52,9 Mb
Release : 2016-06-16
Category : Electronic
ISBN : 9783731504542
Author : Kehrer, Maria Loredana
Publisher : KIT Scientific Publishing
Page : 204 pages
File Size : 54,9 Mb
Release : 2019-06-13
Category : Technology & Engineering
ISBN : 9783731509240
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 : Albiez, Jürgen
Publisher : KIT Scientific Publishing
Page : 222 pages
File Size : 49,5 Mb
Release : 2019-05-22
Category : Technology & Engineering
ISBN : 9783731509189
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 : Rieger, Florian
Publisher : KIT Scientific Publishing
Page : 202 pages
File Size : 44,5 Mb
Release : 2016-07-01
Category : Electronic
ISBN : 9783731505136
Author : Ruck, Johannes
Publisher : KIT Scientific Publishing
Page : 220 pages
File Size : 44,5 Mb
Release : 2021-05-07
Category : Technology & Engineering
ISBN : 9783731510727
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.
