·Table of Contents ·Materials Characterization and testing |
Inspection of Fibre Based Technical Composites by Radioscopy and Computed TomographyC. Sauerwein, M. SimonHans Wälischmiller GmbH, Schießstattweg 16, D- 88677 Markdorf J. T. Rheinländer Risø National Laboratory, Materials Research Department, PO Box 49, DK-4000 Roskilde FIBRINS Project No BE97-5129, funded by the European Community consortium |
Industrial x-ray sources with focus sizes of 0.2 mm and microfocus tubes
have been applied in combination with different x-ray detector types.
Radioscopic images taken by means of scanning the fibre reinforced samples
with a 200 mm linear diode array with 2048 pixels have been compared to those
taken directly by a high quality radioscopic system with image intensifier
type (GAMMASCOPE GS300) as well as to those taken with a flat panel detector.
The flat panel detector is based on amorphous silicon with 1024 x 1024 pixels
and a pixel size of 400 µm.
Due to the combination with the microfocus
x-ray source with a focal spot size of about 10 microns all detectors could
have been used to visualise not only the fibre bundles but also the individual
fibres of the samples.
As examples microfocus radioscopies of a glass fibre reinforcement taken with the amorphous silicon detector are shown in figures 1 and 2. The fibre bundles are orientated as unidirectional woven roving, which is normally used for the so called hand-lay-up process. Figure 1 shows the fibre bundles. The x-ray voltage has been chosen in order to visualise only the glass fibres, but not the thread, which is orientated perpendicular to the fibre bundles. Figure 2 shows a radioscopy of the same sample, but with a higher magnification by means of a lower source to object distance. Therefore the individual glass fibres inside the bundles are visible
Fig 1: Radioscopy of a glass fibre reinforcement. The unidirectional orientated fibre bundles are visible. | Fig 2: Enlarged segment of the sample of figure1. Individual fibres of the fibre bundles are visible. |
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