NDTnet 1998 Aug, Vol.3 No.8

Abstract

CSM Materialteknik is a Swedish subsidiary to Saab and Celsius. CSM is specialised in materials technology with special focus on aerospace. CSM's NDT department has during the last years participated in and ran some interesting national and international research projects. This poster /paper will summarise the most important results. A quick look at ongoing projects will also be given.The participation in a now finished Brite-Euram project has primarily resulted in the development of a fieldable scanning system. Vital requirements on components both for the mechanical scanner, the hardware and the software were identified and satisfied. In fact, two scanners resulted, onemechanical controlled by stepper motors in two orthogonal axes which can be mounted on the object with vacuum cups and a miniaturised scanner (for inspections of areas with limited access)which has to be moved over the object by the operator. The hardware and software are adapted tomake the system compatible with a large number of NDT methods and instruments. The applicability of the scanning system will be further developed in an on-going Brite-Euram project, CANDIA.

An application example of the scanning system is "KREP", a Swedish development project. The purpose of KREP is to develop techniques to repair damaged aeroplane structures of polymer composites. Essential for the quality assurance of the repair is the ability to perform damage survey of high quality and to be able to check the final quality of the repaired volume. Good NDT results have been obtained for both cases. Noticeable is that the scanning system has showed excellent results in field environment, i.e. outdoors and in various positions including heavily curved surfaces and up sidedown.

A project where focus has been on developing the used NDT methods is concerned with developing methods to detect damage on stressed polymer composites. Acoustic emission and high resolution ultrasonic testing have been used and compared. A good correlation between AE and UT was found except for very small damages. During the project the used methods have been refined, especially with respect to more accurate UT measurements. The knowledge gained in this project is a better understanding of the damage mechanisms in composites and of the interpretation of AE signals. Thiswill be used and further developed in an ongoing follow up project.

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:

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