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Technical Paper

Nondestructive Testing of Beryllium

1968-02-01
680652
Beryllium, the new miracle material of the aerospace industry, has presented problems for nondestructive testing. Eddy current and penetrant encounter no particle difficulties, except those inherent in the tests themselves. ...Eddy current and penetrant encounter no particle difficulties, except those inherent in the tests themselves. But, radiography and ultrasonics have encountered problems because beryllium is nearly transparent to X-ray, and the velocity of sound in beryllium is extremely high. ...The new improved nondestructive techniques and equipment are all capable of meeting the standards of production.
Technical Paper

Ultrasonic Holography in Nondestructive Testing

1970-02-01
700599
The results of typical nondestructive test applications in metals, plastics, ceramics and composites are presented....The instrument permits real-time imaging of test objects as they are moved through the ultrasonic field of view. Advantages of the instrument are discussed.
Technical Paper

Nondestructive Testing of Graphite Fiber Composite Structures

1970-02-01
700750
This paper discusses nondestructive testing (NDT) methods and techniques for detection of material and manufacturing anomalies in state-of-the-art graphite composites. ...Reference standards are fabricated with built-in discontinuities, commensurate with each structural article fabricated. The test specimens and parts were tested by various methods in order to determine optimum discontinuity detection. ...The test specimens and parts were tested by various methods in order to determine optimum discontinuity detection. Tests were conducted on research and development graphite composite aircraft structures consisting of (1) molded graphite flap ribs, (2) graphite composite flap assembly, and (3) graphite composite horizontal stabilizer assembly.
Technical Paper

Extended Non-Destructive Testing of Composite Bonds

2011-10-18
2011-01-2514
Therefore, a set of advanced non-destructive testing techniques is applied and adapted to the characterization of CFRP bonded structures as well as the state of adherend surfaces before bonding within the ENCOMB-project. ...As a medium-scale European Consortium funded within the 7th Framework Programme, ENCOMB (Extended Non-Destructive Testing of Composite Bonds) brings together leading experts in aeronautics research and development providing advanced non-destructive testing methods for reliable quality assurance of adhesive bonds of CFRP structural components. ...As a medium-scale European Consortium funded within the 7th Framework Programme, ENCOMB (Extended Non-Destructive Testing of Composite Bonds) brings together leading experts in aeronautics research and development providing advanced non-destructive testing methods for reliable quality assurance of adhesive bonds of CFRP structural components.
Technical Paper

Development of a vibroacoustic system for non-destructive test in aerospace structures

2008-03-30
2008-36-0557
The present work describes an alternative way (to ultrasound) to check the existence of superficial flaws in sandwich panels used in the aerospace industry, based in a technique inspired in the well known "tap test". In this case, however, a non-impulsive excitation is provided by a especial transducer and the acoustic response is captured with a microphone.
Technical Paper

In-Process Non-Destructive Microweld Inspection Techniques

1968-02-01
680798
Degradation of weld strength beyond that which is unacceptable in the end product can always be detected non-destructively. This detection is best made during the weld cycle by monitoring a combination of three parameters: voltage pulse, infrared radiation, and setdown.
Technical Paper

Health Management and Non-destructive Evaluation for Reusable Launch Vehicles

1994-10-01
942153
Martin Marietta is developing the methodology to determine the health of reusable launch vehicle systems and demonstrating this methodology on a composite cryogenic tank. Non-destructive evaluation and health management techniques combine to provide an operationally efficient, autonomous inspection/monitoring system. ...Non-destructive evaluation and health management techniques combine to provide an operationally efficient, autonomous inspection/monitoring system. Non-destructive evaluation techniques will initially perform inspections and determine structural integrity. ...Health management systems will automatically collect and analyze system data during operations to determine system status. Non-destructive evaluation methodologies will be directed by the health management system to reduce the amount of required post-flight inspection for recertification of reusable cryogenic tanks.
Technical Paper

Fast Accurate Non-Destructive Measurement of Absorber Impedance and Absorption

2019-06-05
2019-01-1584
Measurements of absorbing interior trim are traditionally performed using either sample holder tests in a static impedance tube (impedance and absorption), or through tests in reverberation rooms (absorption only). ...This paper describes fast non-destructive tests using a portable flanged impedance tube, and how they be used to quantify and optimise the absorption of interior trims. ...Finally, while non-destructive methods using hand-held probes also measure absorption, they are not able to measure impedance accurately.
Journal Article

A Non-Destructive Method to Classify the Correct Installation of Blind Bolts

2013-09-17
2013-01-2184
In this research work a nondestructive method for blind bolt installation is developed. Several potential inspection techniques (shearography, thermography, frequency response methods and ultrasonic methods) are tested for blind bolting inspection suitability assessment. ...Several potential inspection techniques (shearography, thermography, frequency response methods and ultrasonic methods) are tested for blind bolting inspection suitability assessment. An ultrasonic measurement technique is identified as partially capable of classifying bolt installation. ...A further development, combining ultrasonic methods and process monitoring data, has led to a bind bolt installation classification method with a hit rate >95% on tested samples.
Technical Paper

Nondestructive Characterization of Pitting Corrosion Damage and Fatigue Life

1998-11-09
983127
Microradiographical and ultrasonic methods for the determination of pitting corrosion depth is discussed. Fatigue crack initiation and growth from artificial pits of different depths is studied experimentally. The experime-ntal results were analyzed using fracture mechanics models including those for small cracks. The model shows very good agreement with experiment in describ-ing the initiation and growth of a crack emanating from a pit and in predicting the dependence of the reduction of fatigue life on pit size. Using this analysis, a relation between the depth of the corrosion pit and the fatigue life is established, and thus the prediction of fatigue life of the sample with corrosion pit is related to the radio-graphic and ultrasonic measurements.
Technical Paper

On-Line Non-Destructive Measurement for Interference-Fit Riveting Based on Force-Deformation Data Analysis

2017-09-19
2017-01-2072
Conventional interference-fit level measurement methods can be divided into direct measurement (destructive test on test-piece) and indirect measurement (off-line dimensional measurement of upset rivet head). ...In this paper, an on-line non-destructive measurement method is developed to measure the interference-fit level. By taking full advantage of servo-driving riveting integrated with force measurement, the force-deformation data of the deformed rivet can be obtained in real time.
Technical Paper

Nondestructive Damage Detection and Life Cycle Predictions for Advanced Composite Components

2004-09-21
2004-01-2818
Advanced materials including metal matrix, ceramic metal matrix and other composites/metals are critical to numerous applications associated with the development of next-generation aircraft architectures whose goal is to produce aerospace platforms that are more cost efficient, safe and reliable. The wide variety of advanced materials used in aerospace construction creates significant challenges for existing material characterization technologies. Photon Induced Positron Annihilation and related technologies are currently being used to assess fatigue, thermal degradation, creep, and embrittlement in aircraft components composed of advanced composite and metal alloy materials from initial manufacture through failure, thereby providing a new reliability assessment tool for pre- and post-mission component evaluations and likelihood-of-failure assessments.
Technical Paper

Nondestructive Evaluation of Surface Treatments Including Thermal Barrier Coating Damage and Effectiveness

2004-09-21
2004-01-2841
Ceramic thermal barrier coatings (TBC) and surface treatments are being developed for advanced turbine engine applications to provide critical insulation that results in lower component temperatures and extended fatigue life. This translates into improved reliability and efficiency with reduced life cycle costs. However, the durability of these coating systems remains a crucial issue at the higher operating temperatures and extended exposure times associated with current and next generation turbine engine designs. Standard inspection techniques are unable to detect pending TBC failure or other surface treatment failures until they have already occurred and with possibly, catastrophic effects. Distributed Source Positron Annihilation technology is a portable, near-surface inspection tool that has demonstrated the capability to quantify microstructural changes in surface treatments and TBCs.
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