Microstructure Modeling And Crystal Plasticity Parameter Identification For Predicting The Cyclic Mechanical Behavior Of Polycrystalline Metals
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Microstructure modeling and crystal plasticity parameter identification for predicting the cyclic mechanical behavior of polycrystalline metals
Author: Kuhn, Jannick
language: en
Publisher: KIT Scientific Publishing
Release Date: 2023-04-04
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.
On multi-scale modeling of fatigue in short glass fiber reinforced thermoplastics
Author: Hessman, Patrick Arthur
language: en
Publisher: KIT Scientific Publishing
Release Date: 2025-03-31
This work covers the topic of micromechanical modeling of the elastic and fatigue behavior of short glass fiber reinforced thermoplastic composites (SFRTs). A novel algorithm extracts microstructural data from x-ray micro-computed tomography scans. Analytical homogenization schemes are studied and used to predict elastic properties, while a high cycle fatigue model using the Two-Step scheme incorporates damage variables for fibers and matrix, predicting fatigue limits.
A computational multi-scale approach for brittle materials
Author: Ernesti, Felix
language: en
Publisher: KIT Scientific Publishing
Release Date: 2023-04-17
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.