## 5 Werkstofftechnik

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#### Erscheinungsjahr

- 2015 (41) (entfernen)

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#### Sprache

- Englisch (41) (entfernen)

#### Referierte Publikation

- nein (41) (entfernen)

#### Schlagworte

- Simulation (5)
- EBSD (4)
- Fatigue (4)
- Glass (4)
- LTCC (4)
- CCS (3)
- Corrosion (3)
- Microstructure (3)
- Sintering (3)
- Transmission electron microscopy (3)
- Aquifer (2)
- Bioactive (2)
- CFRP (2)
- Carbon storage (2)
- Crack propagation (2)
- Crystallization (2)
- Damage evolution (2)
- Degradation (2)
- Electron backscatter diffraction (2)
- Fractography (2)
- Fracture mechanics (2)
- Hybrid components (2)
- Microelectronic packaging (2)
- Microfluidics (2)
- Orientation mapping (2)
- Pultruded fibre rods (2)
- Sensor (2)
- Spar cap design (2)
- X-ray diffraction (2)
- X-ray-refraction (2)
- Aluminium alloy (1)
- Aluminium alloy 2618A (1)
- Aluminium alloys (1)
- Austenitizing (1)
- BST (1)
- Band detection (1)
- Barium and calcium silicate plass powders (1)
- Buried thick film resistors (1)
- Carbon capture (1)
- Carbon dioxide (1)
- Coarsening (1)
- Commercially pure iron (1)
- Creep (1)
- Cross-correlation (1)
- Crystal lattice (1)
- Crystal orientation (1)
- Degassing (1)
- Ductility (1)
- EBSD pattern (1)
- Electron Rutherford backscattering (1)
- Electron diffraction (1)
- European TENSTAND project (1)
- Ferroelectric (1)
- Foaming (1)
- Force controlled TMF testing (1)
- Four point bending test (1)
- Fully printed component (1)
- Glass-like carbon (1)
- High pressure (1)
- High temperature (1)
- High-purity iron (1)
- ISO 6892-1 (1)
- Image processing (1)
- Kikuchi diffraction (1)
- Kikuchi pattern (1)
- LTCC Multilayer (1)
- Lattice parameter determination (1)
- Microscopy (1)
- Misindexing (1)
- Nano characterization (1)
- Nanoanalytic (1)
- Nanomaterial (1)
- Nanoparticle (1)
- Non-centrosymmetry (1)
- Orientation noise (1)
- Orientation precision (1)
- Oxidation (1)
- PA-GF30 (1)
- Pattern indexing (1)
- Pattern matching (1)
- Phase analysis (1)
- Phase shifter (1)
- Powder diffraction (1)
- Precipitation (1)
- Pressure-assisted sintering (1)
- Pseudo symmerty (1)
- Pure iron (1)
- Purity level (1)
- Pyrite (1)
- Round-Robin (1)
- Short-Fibre-Reinforced Polymadide (1)
- Silicate glass powders (1)
- Spinel (1)
- Sponsorship programme (1)
- Strain controlled tensile testing (1)
- Strain rate (1)
- Stress rate (1)
- Structure viewer (1)
- Subgroup relationship (1)
- Subgroup relationships (1)
- TKD (1)
- Tensile properties (1)
- Tensile strength (1)
- TiO2 (1)
- Topotactic transformation (1)
- Ultra-high-purity iron (1)
- Yield strength (1)
- composites (1)
- debonding (1)
- energy release rate (1)
- failure process (1)
- fracture mechanics (1)
- glass-like carbon (1)
- hot-embossing (1)
- low temperature co-fired ceramics (1)
- pressure-assisted sintering (1)

#### Organisationseinheit der BAM

- 5 Werkstofftechnik (41) (entfernen)

For the design of laminates the knowledge of the failure behaviour of plies under multiaxial stresses is a necessary precondition. The strength of plies under multiaxial stresses commonly is determined by standard off-axis tests using fixed clamps. By varying the off axis angle the ratio of shear to normal stresses can be prescribed. However, by preventing the rotation a complex stress field develops which strongly varies with the off axis angle as well. While these effects are not crucial when determining the elastic material parameters since the stress state in the center of the specimen is not far from the ideal uniaxial stress state they have a great influence on the failure behaviour.

Components in the Aerospace, Power and Automotive engineering sectors are frequently subjected to cyclic stresses induced by thermal fluctuations and mechanical loads. For the design of such components, reliable material property data are required which need to be acquired using well accepted and reproducible test procedures for thermo-mechanical fatigue (TMF) loading. Available materials TMF property data are limited so that there is a need for further TMF data generated by TMF testing. The TMF behaviour of materials is often desired to be simulated in models which describe the cyclic stress-strain behaviour, the fatigue life and the cyclic crack growth behaviour. There is a continuous need for the development and amendment of such models. Models can be validated by using materials in industrial applications which are subjected to TMF loading.

Combining CO2 Streams from Different Emitters – A Challenge For Transport And Storage Infrastructure
(2015)

The European Directive 2009/31/EC on the geological storage of CO2 envisages an open access of CO2 streams from different emitters to a nation- or even EUwide CO2 pipeline network if CO2 stream compositions meet “reasonable minimum composition thresholds”. As of today it is not known how such “composition thresholds” may be defined and which impurity levels may be viable in practical application.
To set up recommendations for criteria and respective threshold values for CO2 stream compositions, the project “CLUSTER” will investigate how a dynamic interplay – both in terms of mass fluxes and compositions – of CO2 streams from regionally clustered CO2 sources sharing a transport and storage infrastructure will impact corrosion, e.g., of pipelines and plant components, and geochemical alteration of cap rocks and reservoir rocks. In addition, the behaviour of such a highly dynamic CCS system will be considered for an overall optimization of system design including CO2 stream mixing schemes and facilities or interim CO2 storage.

The damage process of short glass fibre (30% weight) reinforced polyamide caused by mechanical loading was investigated from the beginning on micro cracking level to the incipient crack of mm-dimension. Based on high resolution computer tomography and the X-ray-refraction technique the inner surface due to micro-cracking at the short fibre ends and the fibre matrix debonding of the skin surface of the filament was determined quantitatively. With the knowledge of the fatigue crack propagation rate and fracture toughness of the material from former research projects, it was derived that the total inner surface due to micro cracks measured by X-ray refraction is much higher than the specimen could have withstand the load, supposed the surface is in a localized crack. Hence, the damage process could be described from micro to macro level. Accompanying fractographic investigations endorse the modelling based on the NDT-techniques.

In November 2007, OECD’s Working Party on Manufactured Nanomaterials (WPMN) launched the Sponsorship Programme for the Testing of Manufactured Nanomaterials (hereafter the Testing Programme). The objective was to conduct specific tests, relevant to human health and environmental safety endpoints, on a variety of manufactured nanomaterials (MN). The outcomes of the Testing Programme were intended to assess the applicability of the existing test guidelines1 to nanomaterials, as well as to provide useful information on any intrinsic properties of MNs, which are different from the same bulk material with greater external dimensions. Understanding the properties of NMs is crucial to choose appropriate strategies for hazard identification, risk assessment or risk management measures. The Testing Programme involved delegations from OECD member countries, some non-member economies and other stakeholders. The broad international representation, from a range of delegations enabled the programme to pool expertise and resources without which this programme would not have been possible.

The kinetic energy of keV electrons backscattered from a rutile (TiO2) surface depends measurably on the mass of the scattering atom. This makes it possible to determine separately the angular distribution of electrons backscattered elastically from either Ti or O. Diffraction effects of these backscattered electrons inside the rutile crystal lead to the formation of Kikuchi patterns. The element-resolved Kikuchi patterns of Ti and O differ characteristically, but each can be described fairly well in terms of the dynamical theory of diffraction. Qualitatively, much of the differences can be understood by considering the relative arrangement of the Ti and O atoms with respect to planes defined by the crystal lattice.

For the description of (single) crystal orientations, e.g. as measured by electron backscatter diffraction (EBSD) & X-ray diffraction (XRD), Euler angles are still generally used to import and export data. However, because of the lack of standard definitions for the unit cell reference settings and specimen axes, several transformation descriptions exist which produce different sets of Euler angles for the same orientation. There is also no recommended region within the minimal Euler orientation space into which orientations should be placed. This is the reason why different sets of Euler angles for the same orientation are generated by the available software packages for indexing EBSD patterns. These issues are reviewed and addressed.
The influence of crystal symmetry in form of chiral (enantiomorphic) groups is discussed, as well as how multiple, but symmetry-equivalent sets of Euler angles can be reduced in order to deliver a unique orientation description. The Euler coloring algorithms applied to EBSD map data is critically discussed. The specific case of cubic symmetry, especially the effect of the three-fold rotation on the Euler space is investigated in more detail for the highest-symmetric chiral group 432. Recommendations for standard settings of the unit cell to orthogonal coordinate system transformation are given which exploit inherent symmetry.