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This Month's Introduction

Most of this month's issue focuses on the full-text papers of the ECNDT '98 Aerospace Session. One such article is "Characterization of Defects in Composite Materials Using Rapidly Acquired Leaky Lamb Wave Dispersion Data, " co-authored by Y. Bar-Cohen et. al. Jet Propulsion Lab. In conjunction with this article, we are pleased to introduce Dr. Yoseph Bar-Cohen, who will serve as the coordinator for the questions and comments on NDE of Aircraft Structures for the September 1998 Forum of NDT.net. He is now our Virtual Session Chairman.

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This Month's Articles

Aero- space

Aeronautical industry can be divided into two general fields: engines and aircraft structure. Materials and processes differ essentially in both areas, so that both products are manufactured in separate companies or divisions. But both areas have to cope with highest safety in operation as well as economic efficiency. It is the aim of modern design philosophy, to combine these contrasts in highest perfection giving safety the highest priority. The transformation of these aims requires extreme lightweight construction with optimised dimensioning and maximum use of the material. Currently the 'damage tolerance concept' meets best the requirements. A 'damage tolerant structure' must withstand all expected stresses in case of damage until the flaw is detected at a regular scheduled inspection or until a non safety critical malfunction makes the flaw noticeable and requires a repair. All defects exceeding this threshold must be detected securely by NDT. This demonstrates the tight coherence of aircraft design, maintenance concepts and NDT. Experience has shown, that the high safety requirements in aircraft manufacturing and operation can be guaranteed only by integrated solutions. This requires besides a careful analysis of the manufacturing process and the possibly deriving flaws also detailed knowledge about the behaviour of the flaws under the usual and unusual stress when the aircraft is in operation and also knowledge about the resulting in service inspections. Only with NDT methods giving highly reproducible test results this concept can be guaranteed. It is necessary to have detailed inspection procedures with qualified calibration blocks and adequate interpretation rules for the indications as well as highly trained inspection personal familiar with the specific aeronautic materials and designs. Only this ensures the definition of the term 'secure detectable flaw size' within the tension field of economy and safety. (Session Chairman: Gustav Tober, Daimler Benz, Aerospace Airbus) _______________ 3 -Applications of Laser Based Ultrasonics for Aerospace Industry. O. Petillon, J.P. Dupuis - Aerospatiale. H. Voillaume, H. Tretout - Dassault Aviation, France. _______________ 5 -Detection of Deep Lying Cracks by Eddy Current SQUID NDE. M.v. Kreutzbruck, U. Baby, M. Mück, C. Heiden - Uni. of Giessen, Germany. _______________ 7 -Automatic Detection of Defects in Riveted Lapjoints using Eddy Current. F. Lingvall, T. Stepinski - Uppsala Uni., Sweden. _______________ 8 -Determination of the POD for High Resolution Eddy Current Inspection on Turbine Disks. W.D. Feist - Daimler-Benz Aerospace. G.-R. Tillack - BAM. Germany. _______________ 13 -Characterization of Defects in Composite Materials Using Rapidly Acquired Leaky Lamb Wave Dispersion Data. Y. Bar-Cohen - Jet Propulsion Lab. A.K. Mal, Zensheu Chang - UCLA. USA.* _______________ 15 -Ultrasonic Inspection of Adaptive CFRP-Structures. J. Pohl - Uni. of Magdeburg, Germany. _______________ 18 -Lockin-Thermography for Non-destructive Evaluation of Aerospace Structures. D. Wu, A. Salerno, G. Busse - Uni. of Stuttgart, Germany. _______________ 22 -Automated Inspection of Helicopter Rotor Blades using Shearography. M. Honlet - Honlet Optical Systems. A. Ettemeyer - Dr. Ettemeyer. Germany. C. Bouju - EUROCOPTER France. _______________ 24 -New Developments of Pulsed Holography for Industrial Applications. O. Petillon - Aerospatiale, France. _______________ 27 -Quantifying the Damage State of a Quasi-Isotropic CFRP with Embedded Optical Fibres During Fatigue Testing Using Acoustic Emission and Microfocus Radiography. M. Surgeon, M. Wevers - Dept. of Metallurgy and Materials Eng. (Kuleuven), Belgium. _______________ 28 -Developments and Applications of NDT Techniques for the Aeronautical Industry through EC Founded Research Projects. H. Tretout - Dassault Aviation, France. _______________ 38 -Non-destructive Evaluation of Adaptive Material Systems. G. Mook, J. Pohl, P. Veit - Uni. of Magdeburg, Germany. _______________ 41 -Detection of Thermal Damage in Steel Components After Grinding Using the Magnetic Barkhausen Noise Method.* A.S. Wojtas - Stresstech, The Netherlands. L. Suominen, B.A. Shaw - Uni. of Newcastle, UK. J.T. Evans - Stresstech, Finland. _______________ 43 -Aircraft Wheel and Fuselage Testing with Eddy Current and SQUID. H.-J. Krause, R. Hohmann, M. Grüneklee, M. Maus a.o. - Forschungszentrum Jülich, Germany. _______________ 46 -Review of Advanced Ultrasonic Techniques for Aerospace Structures. H. Tretout - Dassault Aviation, France. _______________ 51 -Automatic Detecting Disbonds in Layered Structures using Ultrasonic Pulse-echo Inspection. T. Stepinski - Uppsala Uni.. B. Vagnhammar - IAR Systems. Sweden _______________ 55 -CS-Pulsed Eddy Current Inspection for Cracks in Multi-Layered Joint A1-Alloy Aircraft. W. Bischoff, H.-A. Crostack, M. Maass - Uni. of Dortmund. Th. Meier, G. Tober - Daimler-Benz Aerospace Airbus.* _______________ 56 -Qualification and Certification of Inspection Personnel in the European Aerospace Industry. R. Henrich, G. Tober - Daimler-Benz Aerospace Airbus, Germany. > If we'll receive more Articles of this session, we'll updated those on the frontpage of future NDT.net issues. > Miss the NDT of Aircraft issue 09/97? You may discuss these Articles NDT.net Forum

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NDTnet News - Market - Technology News Archive '98 - '97 - '96

Airborne Ultrasonic Flaw Detector Makes The Un-Inspectable...Inspectable. Huntington Beach, CA-NDT Systems 3.8.98 Phased Array Technique Helps to Inspect a Water Friction Brake for 220 MW Turbines . The control of the probes and the data evaluation was carried out with the Mini-SAPHIR Phased Array Inspection System. This high performance digital instrument, recently designed at the Federal Institute for Materials Research and Testing (BAM)/Berlin and now manufactured by Siemens AG/Erlangen as a licensee, offers the possibility of driving four phased array transducers simultaneously. A Complete UT Instrument on a Single PCI-Board. Quality Network Inc., the authorized affiliate of the Fraunhofer-Institute Nondestructive Testing in Saarbrücken, Germany, has introduced PCUS 11, a new Pulser/Receiver and Digitizer board for comprehensive PC-controlled ultrasonic testing. NDT.net Updated Mission Statement Our main goal is to serve the NDT community with free access NDT publications. NDTnet offers all NDT Publishers of Conferences and Journals a free Internet publishing service for abstracts and full-text articles. ANDSCAN® . . . Can be used to check aircraft fuselage panels for corrosion; carbon-fiber composite structures for impact damage and delamination; pipeline welds for subsurface defects; and pipeline tube walls for remaining thickness. Discover Magazine Breakthrough technologies: "electroactive polymers" Bar-Cohen, a physicist at Caltech's Jet Propulsion Laboratory, has made two different types of artificial muscles. New Approaches to Non-Destructive Testing "Is this plane safe to fly?" Headlines like those above are becoming more common with the ever-growing age of the nation's commercial and military aircraft fleets. Finding Structural Fatigue Before It's Too Late! Ultra Optec Homepage: Reference and Press See also the LUIS 747. The Laser-Ultrasonic Inspection System LUIS 747 is the product of years of development in effort to apply laser-ultrasonics to the inspection of polymer-matrix composite materials. RAPIDUS is a new CORDIS Database Service Registered CORDIS users can now save search profiles and receive automatic updates by Email of search results that match search criteria. You can register free for this service. CORDIS is the European Community R&D Information Service.