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Ultrasound lockin thermography - feasibilities and limitations
Viewed 309 times since Thu, Apr 26, 2012
Conventional thermal wave imaging methods based on optical excitation are sensitive to all thermal boundaries and structures.  However, if ultrasound is used for energy deposition, areas of enhanced mechanical loss angle are heated up sele... Read More
Ultrasonic signal processing methods for detection of defects in composite materials
Viewed 311 times since Thu, Apr 26, 2012
Ultrasonic technique is one of widely used techniques for nondestructive testing (NDT) of materials [1, 2]. In ultrasonic testing useful information about integrity or geometry of the object under a test is obtained. Measurement configuration often... Read More
Ultrasonic Air-Coupled Non-Destructive Testing of Aerospace Components
Viewed 280 times since Sat, Feb 11, 2012
In the paper two different single-side air-coupled ultrasonic techniques for detection and visualization of the defects in aerospace composite materials are presented. The first technique is based on the pitch-catch arrangement of the transducers... Read More
Standard Practice for Infrared Flash Thermography of Composite Panels and Repair Patches Used in Aerospace Applications
Viewed 395 times since Sun, Oct 28, 2012
This practice describes a procedure for detecting subsurface flaws in composite panels and repair patches using Flash Thermography (FT), in which an infrared (IR) camera is used to detect anomalous cooling behavior of a sample surface after it has... Read More
REVIEW OF NONDESTRUCTIVE EVALUATION TECHNIQUES FOR FRP COMPOSITE STRUCTURAL COMPONENTS
Viewed 422 times since Mon, Dec 10, 2012
This report presents a comprehensive literature review on NDE techniques that could be used for evaluating damage and assessing the structural integrity of retrofitted FRP composite systems. The structural integrity of FRP bonded systems is dependent... Read More
NDT - A Continueing Responsibility in the Future of Aerospace
Viewed 253 times since Sun, Mar 3, 2013
As the aerospace industry soars into the 21st century, the NDT community that supports it faces a variety of exciting challenges. These challenges include the manufacturing evaluation of the newest aerospace structures and materials and the in... Read More
NDE DETECTION OF MANUFACTURING DEFECTS IN COMPOSITE BONDED JOINTS USING CFBG SENSORS
Viewed 238 times since Sun, Mar 3, 2013
The increasing use of bonded joints for structural application has created a need for reliable post-bonding joint inspection techniques. Ultrasonic C-scan [1] and pulse thermography [2] have both been used successfully to detect bond defects. At... Read More
MEASUREMENT AND MODELING OF INTERNAL STRESSES AT MICROSCOPIC AND MESOSCOPIC LEVELS USING MICRO RAMAN SPECTROSCOPY AND X-RAY DIFFRACTION
Viewed 233 times since Sun, Mar 3, 2013
In this study, we use x-ray diffraction (XRD) and micro Raman spectroscopy (MRS) to measure internal strains in sensors embedded in polymer matrix composites. Two types of strain sensors embedded in either chopped graphite fiber/epoxy matrix... Read More
EDDY CURRENT SENSOR ARRAY. APPLICATION TO NONDESTRUCTIVE EVALUATION OF CARBON-EPOXY COMPOSITES
Viewed 319 times since Wed, Aug 24, 2011
This paper presents the functioning of an eddy current sensors array, made from a rectangular emission coil inside whom reception sensors are disposed under the shape of a rectangular lattice. The signals delivered by the sensors from array... Read More
EDDY CURRENT INSPECTION OF GRAPHITE FIBER COMPONENTS
Viewed 417 times since Wed, Aug 24, 2011
Nondestructive testing of aerospace components provides a challenging research activity for the evaluation of new technologies. Graphite-based composites are becoming more accepted in critical structures which require a high strength-to... Read More
Composite Material Defects Characterization Using Leaky Lamb Wave Dispersion Data
Viewed 331 times since Fri, Nov 11, 2011
Leaky Lamb waves (LLW) propagation in composite materials has been studied extensively since it was first observed in 1982. The wave is induced using a pitch-catch arrangement and the plate wave modes are detected by identifying minima in ... Read More
APPLICATION OF RAMAN SPECTROSCOPY FOR NONDESTRUCTIVE EVALUATION OF COMPOSITE MATERIALS
Viewed 349 times since Sat, Oct 8, 2011
This paper will present an overview of efforts to investigate the application of Raman spectroscopy for the characterization of Kevlar materials. Raman spectroscopy is a laser technique that is sensitive to molecular interactions in... Read More
Air-Coupled Ultrasound Inspection as a New Non-destructive testing tool for Quality Assurance
Viewed 386 times since Sat, Sep 24, 2011
Conventional ultrasound inspection has been a standard non-destructive testing method for a long time.  Read More
Aerospace NDT with Advanced Laser Shearography
Viewed 485 times since Sat, Sep 24, 2011
Shearography nondestructive testing has evolved considerably since first used on a production aircraft program in the USA in 1986. Shearography laser interferometric imaging methods measure test structure deformation due to an applied... Read More