NDTnet 1998 Aug, Vol.3 No.8

Full-Text - Abstract

The reliability of nondestructive methods depends on a lot of parameters in a mostly complex form so that general validations of the methods will be relatively difficult and cannot give so much adequate informations on the very wide range of different applications of the methods. Nevertheless, informations on the influence of the parameter variations on the result are well known or can be determined (experiment, modelling), so that the reliability for many special applications may be determined.

In magnetic particle inspection, experimental investigations on the correlations between the recognition of the indications and the inspection parameters where carried out. For standardized testing procedures and realistic parameter variations the probability of detection will be determined in dependance on the dimensions of natural and artificial defects (length, depth). The recognition of the indications may be realized by automated image-processing systems. But in most cases the indications are recognized visually by the inspection personell, resulting in a special uncertainty known as the "human factor".

Special investigations where carried out to determine the quality of the detection media on reference blocks following the proposal for the european standard prEN 9934-2. The results indicate that an objective valuation of the detection media will be possible which correlates to the practical demands. Other influences on the visibility are variations resulting from the application of the detection medium, magnetization, inclination of the test surface, surface conditions and viewing conditions.

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

Publication Contact:
7th ECNDT, Park Alle 345, DK-2605 Broendby, Denmark, Fax: +45 46 26 70 11, Email: 101373.3414@compuserve.com