A5059326112- Cellular and Composite Structures
- Advanced ceramic materials synthesis
- Composite Material Mechanics
- Elasticity and Material Modeling
- Metallurgy and Material Forming
- Fatigue and fracture mechanics
- Metal Forming Simulation Techniques
- Innovations in Concrete and Construction Materials
- Additive Manufacturing and 3D Printing Technologies
- Polymer Foaming and Composites
- Numerical methods in engineering
- High Temperature Alloys and Creep
- Aluminum Alloys Composites Properties
- High-Velocity Impact and Material Behavior
- High-Temperature Coating Behaviors
- Advanced materials and composites
- Material Properties and Applications
- Tunneling and Rock Mechanics
- Nuclear Materials and Properties
- Materials Engineering and Processing
- Electronic Packaging and Soldering Technologies
- Nonlocal and gradient elasticity in micro/nano structures
- Composite Structure Analysis and Optimization
- Polymer composites and self-healing
- Recycling and utilization of industrial and municipal waste in materials production
TU Bergakademie Freiberg
2015-2024
Forschungsinstitut für Leder und Kunststoffbahnen
2024
Helmholtz-Zentrum Dresden-Rossendorf
2005-2007
This paper describes a modification of Ehlers' model for the inelastic behavior geomaterials. The newly developed modified is intended to describe highly porous media such as open-cell foams. key feature subtle change yield potential, which allows correct orientation triangularly-shaped surface cross sections that depend on hydrostatic stress state. incorporated into general framework isotropic plasticity. An elastic predictor/plastic corrector algorithm employed solve constitutive...
Herein, a general methodology to describe the complex inelastic macroscale behavior of cellular media is presented. It an important contribution toward establishing predictive computational tools study structure−property−performance relations in such materials. A particular challenge given by possible complexity macroscopic response, which makes it difficult capture with classical phenomenological approaches. Numerical micro−macro transitions schemes, as FE 2 method, have recently been used...
Raman spectroscopy was applied to investigate the residual thermal strain in thick GaN layers grown epitaxially on sapphire substrates by hydride vapour phase epitaxy. The thickness of varied from 20 300 µm. distribution as a function distance GaN/sapphire interface determined non-destructively applying confocal technique. were found be exposed compressive stress whereas relaxation top each film could observed.
In this article, a numerical study on the sensitivity, related to performance of open‐cell foams used for depth filtration liquid metals, two characteristic morphological properties is presented. Therefore, simulations fluid flow and particle transport inside an artificial foam structure are carried out, whose porosity strut shape varied within certain expected range. For comparison purposes, however, also performed three typical ceramic filters (CFF) with pore densities 20 30 PPI,...
Dealing with foam structures, some kinds of computer simulations require accurate volumetric models for high quality results. Those a large computational effort. For simplification often less complex like beam are used. The present work analyses the differences effective elastic properties between and corresponding Kelvin cell. Furthermore, influence certain geometry details on beside relative density is shown.
This article demonstrates an approach for the numerical modeling of open cell ceramic foams, in order to investigate thermo‐mechanical behavior during metal melt filtration processes. The described methods include creation geometric models, fluid‐dynamic simulations flow using lattice boltzmann method, and finite element foam under general loads. paper mainly focuses on representative geometry generation process, such that modeled replicates real as far possible, since high quality models...
To widen the understanding of tensile failure reticulated ceramic foams and expand available mechanical method, a cylindrical splitting test is developed in present study based on alumina open-cell three different pore densities. The biaxial method validated by characterization parameters in-situ fracture process digital image correlation, followed formula correction for effective strength with consideration discrete crack paths. For experimental setup curved loading platens, compliant pad...
This paper compares two different methods for the identification of ductile properties materials using small punch test to measure material response under loading. The finite element method is used calculate load displacement curve depending on parameters a hardening law. Via systematical variation data base built up, which train neural networks. second allows indentification by conjugate directions algorithm, minimizes error between an experimental and one calculated network function.
In recent years the small punch test method has become an attractive alternative compared to traditional material testing procedures, especially in cases where only amounts of are available. contrast standard methods, relevant parameters can not be as simply obtained from experimental measurements SPTs because its non-uniform stress and deformation state. However this achieved by comparing SPT results with those finite element simulations using advanced models. Then task is determine models...