Ingenieurwissenschaften und zugeordnete Tätigkeiten
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Erscheinungsjahr
- 2017 (22) (entfernen)
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- Zeitschriftenartikel (8)
- Vortrag (7)
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- Posterpräsentation (1)
Schlagworte
- Neutron diffraction (6)
- Composites (5)
- Residual stress (5)
- Additive manufacturing (4)
- X-ray refraction (4)
- Additive Fertigung (3)
- Computed tomography (3)
- Eigenspannungen (3)
- Additive Manufacturing (2)
- Ceramics (2)
Eingeladener Vortrag
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3D imaging techniques are very fashionable nowadays, and allow enormous progress in understanding ceramic microstructure, its evolution, and its link to mechanical, thermal, and transport properties. In this feature article, we report the use of a powerful, yet not so wide-spread, set of X-ray techniques based on refraction effects. X-ray refraction allows determining internal specific surface (surface per unit volume) in a non-destructive fashion, position and orientation sensitive, and with a nanometric detectability. While the techniques are limited by the X-ray absorption of the material under investigation, we demonstrate showcases of ceramics and composite materials, where understanding of process parameter influence or simply of microstructural parameters could be achieved in a way unrivalled even by high-resolution techniques such as electron microscopy or computed tomography.
The residual stress distribution of tungsten inert gas welded S235JRC+C plates was determined by means of neutron diffraction(ND). Large longitudinal residual stresses with maxima around 600 MPa were found. With these results as reference, the evaluation of residual stress with high spatial resolution GMR (giant magneto resistance) sensors was discussed. The experiments performed indicate a correlation between changes in residual stresses (ND) and the normal component of local residual magnetic stray fields (GMR). Spatial variations in the magnetic field strength perpendicular to the welds are in the order of the magnetic field of the earth.