Bundesanstalt für Materialforschung und -prüfung

International Symposium (NDT-CE 2003)

Non-Destructive Testing in Civil Engineering 2003
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Non-destructive testing methods for metal foams

H. Stanzick
Fraunhofer-Institute Advanced Materials, Bremen
T. Wenzel, R. Hanke
Fraunhofer-Institute Integrated Circuits - Entwicklungszentrum Röntgentechnik, Fürth
M. Maisl
Fraunhofer-Institute Non Destructive Testing - Entwicklungszentrum Röntgentechnik, Saarbrücken

Abstract:

Metal foams form a new materials class. Despite the promising characteristics of them an introduction to industrial series production is still missing. One of the important reasons for this is the lack of reliable tools for proper inline quality control during the production process. The acceptance of serial production of metal foam components could be increased significantly in case of availability of industrial applicable characterizing methods, i.e. methods that provide all the necessary quality information of foams within a reasonable time scale during series production.

This paper presents first results of an attempt to improve and adapt the method of fast inline computed tomography (CT) to the special field of evaluation of metallic foams.

A short overview of present activities in this research area is given to demonstrate the state of the art in production as well as the existing and unsolved problems, based on still missing reliable and significant inspection tools.

Secondly the approach of volume CT with limited angle projection, fast reconstruction algorithms and integration of specific a priori knowledge is presented as well as methods for subsequent volume data evaluation.

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