Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 31: Polymer physics: special techniques
CPP 31.2: Talk
Wednesday, March 9, 2005, 10:00–10:15, TU C130
THE USE OF MICROFOCUS SYNCHROTRON X-RAY RADIATION AS A NOVEL TECHNIQUE TO STUDY THE INTERFACE IN COMPOSITES — •Konrad Schneider1, Nikolaos Zafeiropoulos1, Richard Davies2, Manfred Burghammer2, and Manfred Stamm1 — 1Institut fuer Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden — 2European Synchrotron Radiation Facility (ESRF) ID13 Beamline, BP 220, F-38043, Grenoble, France
It has been well established that the strength and toughness of fibre-reinforced materials are determined to a great extent by the interface between the reinforcing fibres and the matrix. In the present study we present a novel and very powerful technique based on small angle x-ray scattering (SAXS) to study the interfacial mechanisms of failure in the range of nm. The scattering of x-rays is caused by the difference in the electron density of domains inside the material. In the case of interfacial failure of composites there is an increased number of micro cracks, voids, and debonded areas in which the density is much lower than it is in the undamaged regions. The ID 13 beamline at ESRF, Grenoble enables experiments with a brilliant beam and a spot of about 5 microns. In a multi-fibre epoxy/glass model composite, subjected to the fragmentation test, as well as in a single fibre composite the method is presented in static as well as online mode. The composites were scanned around the optically visible fibre fragments. One may clearly see the areas with a high density of voids, through the higher intensity of the scattered x-rays. The actual state of quantifying this series of patterns to extract the geometrical dimensions and shape of these voids is presented.