Ingenieurwissenschaften und zugeordnete Tätigkeiten
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Erscheinungsjahr
- 2018 (2) (entfernen)
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- Englisch (2)
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- ja (2)
Schlagworte
- Computed tomography (1)
- Effective properties (1)
- Fiber-reinforced composite (1)
- GMR sensors (1)
- Low carbon steel (1)
- Magnetic stray field (1)
- Microstructure (1)
- Neutron diffraction (1)
- Orientation distribution (1)
- Residual stress (1)
Organisationseinheit der BAM
- 7.1 Baustoffe (2) (entfernen)
This paper focuses on the experimental evaluation of one of the key microstructural Parameters of a short-fiber reinforced composite – the orientation distribution of fibers. It is shown that computed tomography (CT) produces results suitable for reconstruction of the orientation distribution function. This function is used for calculation of the effective elastic properties of polymer-fiber reinforced concrete. Explicit formulas are derived for overall elastic moduli accounting for orientation distribution in the frameworks of the noninteraction approximation, the Mori–Tanaka–Benveniste scheme, and the Maxwell scheme.
The approach illustrated can be applied to any kind of composite material.
This study examines the relationship between the magnetic mesostructure with the microstructure of low carbon steel tungsten inert gas welds. Optical microscopy revealed variation in the microstructure of the parent material, in the heat affected and fusion zones, correlating with distinctive changes in the local magnetic stray fields measured with high spatial resolution giant magneto resistance sensors. In the vicinity of the heat affected zone high residual stresses were found using neutron diffraction.
Notably, the gradients of von Mises stress and triaxial magnetic stray field modulus follow the same tendency transverse to the weld. In contrast, micro-X-ray fluorescence characterization indicated that local changes in element composition had no independent effect on magnetic stray fields.