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Review of Progress in Quantitative Nondestructive Evaluation

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Compton Imaging Tomography For Nondestructive Evaluation Of Spacecraft Thermal Protection Systems, Volodymyr Romanov, Eric Burke, Victor Grubsky Jan 2016

Compton Imaging Tomography For Nondestructive Evaluation Of Spacecraft Thermal Protection Systems, Volodymyr Romanov, Eric Burke, Victor Grubsky

Review of Progress in Quantitative Nondestructive Evaluation

Novel nondestructive evaluation (NDE) systems based on a recently pioneered Compton Imaging Tomography (CIT) technique [1-4] are currently being developed by Physical Optics Corporation (POC). CIT provides high-resolution, three-dimensional, Compton scattered X-ray imaging of the internal structure of evaluated objects, using a set of acquired two-dimensional, Compton scattered X-ray images of consecutive cross sections of these objects. Unlike conventional computerized tomography, CIT requires only one-sided access to objects, has no limitation on the dimensions and geometry of such objects, and can be applied to large, multilayer, nonuniform objects. Also, CIT does not require any contact with objects during its application ...


Hybrid Ray-Fdtd Model For The Simulation Of The Ultrasonic Inspection Of Cfrp Parts, Pierre Calmon, Karim Jezzine, Damien Segur, Romain Ecault, Nicolas Dominguez Jan 2016

Hybrid Ray-Fdtd Model For The Simulation Of The Ultrasonic Inspection Of Cfrp Parts, Pierre Calmon, Karim Jezzine, Damien Segur, Romain Ecault, Nicolas Dominguez

Review of Progress in Quantitative Nondestructive Evaluation

Carbon Fiber Reinforced Polymers (CFRP) are commonly used in structural parts in the aeronautic industry, to reduce the weight of aircraft while maintaining high mechanical performances. Simulation of the ultrasonic inspections of these parts has to face the highly heterogeneous and anisotropic characteristics of these materials. To model the propagation of ultrasound in these composite structures, we propose two complementary approaches. The first one is based on a ray model predicting the propagation of the ultrasound in an anisotropic effective medium obtained from a homogenization of the material. The ray model is designed to deal with possibly curved parts and ...


Wearable Knee Health Rehabilitation Assessment Using Acoustical Emissions, Caitlin N. Teague, Sinan Hersek, Jordan Conant, Scott Gilliland, Omer T. Inan Jan 2016

Wearable Knee Health Rehabilitation Assessment Using Acoustical Emissions, Caitlin N. Teague, Sinan Hersek, Jordan Conant, Scott Gilliland, Omer T. Inan

Review of Progress in Quantitative Nondestructive Evaluation

Each year, approximately 200,000 Americans endure anterior cruciate ligament (ACL) tears, and 100,000 reconstructive procedures are conducted to repair the injured knees (1). The injury itself, and the long rehabilitation process that follows, can majorly disrupt the quality of life for these Americans through missed workdays, reduction of overall physical activity, and increased risk of re-injury in future activities. Wearable technologies for quantifying the state of rehabilitation, and providing feedback to the user regarding which activities or intensities of activities are safe to perform at any given time, could potentially help accelerate the rehabilitation process as well as ...


Model-Based Software For Simulating Ultrasonic Pulse/Echo Inspections Of Metal Components, C.P. Thomas Chiou, Frank J. Margetan, Daniel J. Barnard, Ronald A. Roberts, Matthew R. Mckillip, Jared L. Taylor Jan 2016

Model-Based Software For Simulating Ultrasonic Pulse/Echo Inspections Of Metal Components, C.P. Thomas Chiou, Frank J. Margetan, Daniel J. Barnard, Ronald A. Roberts, Matthew R. Mckillip, Jared L. Taylor

Review of Progress in Quantitative Nondestructive Evaluation

The use of models to simulate inspections has played a key role in UT NDE R&D efforts. Over the years, a series of wave propagation models, flaw response models, and microstructural backscatter models have been developed at CNDE to address inspection problems of interest. One use of the combined models is the estimation of signal-to-noise ratios (S/N) in circumstances where backscattered echoes from the microstructure (grain noise) act to mask sonic echoes from internal defects. Such S/N models have been used to address questions of inspection reliability, such as how to optimize the choices of transducer properties ...


Fatigue Crack Monitoring Under High-Cycle Fatigue Loading Using Large-Area Soft Elastomeric Capacitive Sensor, Jian Li, Xiangxiong Kong, William Collins, Caroline Bennett, Simon Laflamme Jan 2016

Fatigue Crack Monitoring Under High-Cycle Fatigue Loading Using Large-Area Soft Elastomeric Capacitive Sensor, Jian Li, Xiangxiong Kong, William Collins, Caroline Bennett, Simon Laflamme

Review of Progress in Quantitative Nondestructive Evaluation

Fatigue cracks under high-cycle fatigue loading due to normal traffic are one of the major damage modes of steel bridges. Monitoring these cracks is of great importance especially for fracture-critical bridges in order to ensure safe operation by preventing catastrophic failure due to excessive damage. A newly developed soft elastomeric capacitive (SEC) sensor [1] is able to monitor strain changes over a large area of structural surface and resist large deformation due to cracking without being damaged. To examine the feasibility of monitoring fatigue cracks under high-cycle fatigue loading using the SEC sensor, a compact tension specimen is tested under ...


Ultrasonic Wavefield Imaging: Research Tool Or Emerging Nde Method?, Jennifer E. Michaels Jan 2016

Ultrasonic Wavefield Imaging: Research Tool Or Emerging Nde Method?, Jennifer E. Michaels

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic wavefield imaging refers to acquiring full waveform data over a region of interest for waves generated by a stationary source. Although various implementations of wavefield imaging have existed for many years, the widespread availability of laser Doppler vibrometers that can acquire signals in the high kHz and low MHz range has resulted in a rapid expansion of fundamental research utilizing full wavefield data. In addition, inspection methods based upon wavefield imaging have been proposed for standalone NDE with most of these methods coming from the SHM community and based upon guided waves. If transducers are already embedded in or ...


Multi-Scale X-Ray Tomography Of Solder Interconnects In Microelectronics, Ehrenfried Zschech, Markus Loeffler, Peter Krueger, Juergen Gluch, K. Kutukova, M. J. Wolf Jan 2016

Multi-Scale X-Ray Tomography Of Solder Interconnects In Microelectronics, Ehrenfried Zschech, Markus Loeffler, Peter Krueger, Juergen Gluch, K. Kutukova, M. J. Wolf

Review of Progress in Quantitative Nondestructive Evaluation

Advanced packaging, including 3D IC integration, is one of the main drivers in packaging and system integration to meet the requirements for miniaturized smart systems with high functionality and high performance. For 3D stacking of wafers or dies, interconnections like micro solder bumps and Cu pillars are used. Figure 1 (left) shows a stack with a TSV interposer structure [1]. 3D-stacked products and advanced packaging challenge materials and process characterization. The control of the micro-bump quality is a particular issue. Special tasks are the characterization of the geometry of the solder bumps to estimate the stress enhancement risks, the nondestructive ...


Frequency Domain Reflectometry Nde For Aging Cables In Nuclear Power Plants, S. W. Glass, A. M. Jones, L. S. Fifield, T. S. Hartman Jan 2016

Frequency Domain Reflectometry Nde For Aging Cables In Nuclear Power Plants, S. W. Glass, A. M. Jones, L. S. Fifield, T. S. Hartman

Review of Progress in Quantitative Nondestructive Evaluation

Degradation of the cable jacket, electrical insulation, and other cable components of installed cables within nuclear power plants (NPPs) is known to occur as a function of age, temperature, radiation, and other environmental factors. System tests verify cable function under normal loads; however, demonstration of some cable’s ability to perform under exceptional loads associated with design-basis events is essential to assuring plant integrity. The cable’s ability to perform safely over the initial 40-year planned and licensed life has generally been demonstrated and there have been very few age-related cable failures.With greater than 1000 km of power, control ...


Advanced Terahertz Data Processing For Nde Applications, C.P. Thomas Chiou, John R. Nagel, Jared L. Taylor, Donald Palmer Jr, Nathan R. Smith Jan 2016

Advanced Terahertz Data Processing For Nde Applications, C.P. Thomas Chiou, John R. Nagel, Jared L. Taylor, Donald Palmer Jr, Nathan R. Smith

Review of Progress in Quantitative Nondestructive Evaluation

Recently terahertz technology (THz) has emerged as a very powerful NDE tool for inspecting and characterizing dielectric materials. Due to its exceptional longitudinal and lateral resolutions, time-domain pulsed THz scan is particularly effective for inspecting thin layered dielectric media. This pulsed scanning produces multi-dimensional data for which advanced processing techniques are needed to extract and analyze the ample information within. In this presentation we conduct a comparable study of several renowned data processing techniques to determine their applicability and performance in processing THz data. These data processing techniques include an outlier detection algorithm based on minimum covariance determinant estimator, the ...


Characterization Of Multi-Layered Impact Damage In Organic Matrix Composites Using Thermography, Travis Whitlow, Satamachary Sathish, Sarah Wallentine Jan 2016

Characterization Of Multi-Layered Impact Damage In Organic Matrix Composites Using Thermography, Travis Whitlow, Satamachary Sathish, Sarah Wallentine

Review of Progress in Quantitative Nondestructive Evaluation

Organic matrix composites (OMCs) are increasingly being integrated into aircraft structures. However, these components are susceptible to impact related delamination, which, on aircrafts, can occur due to a number of reasons during aircraft use and maintenance. Quantifying impact damage is an important aspect for life-management of aircraft and requires in-depth knowledge of the damage zone on a ply-by-ply level. Traditionally, immersion ultrasound has provided relative high resolution images of impact damage. Ultrasonic time-of-flight data can be used to determine the front surface delamination depth and an approximation of the delaminated area. However, such inspections require the material to be immersed ...


Full-Field Imaging Vibrometry For Rapid Non-Destructive Evaluation, James Kilpatrick, Adela Apostol, Vladimir Markov Jan 2016

Full-Field Imaging Vibrometry For Rapid Non-Destructive Evaluation, James Kilpatrick, Adela Apostol, Vladimir Markov

Review of Progress in Quantitative Nondestructive Evaluation

NDE methods calling for spatially extended measurement of surface structural dynamics may be of limited practical application because measurement times are prohibitively slow for use under environmentally variable conditions. However, scanning single beam ultrasound and scanned single beam laser Doppler vibrometry (SLDV), remain as the foremost viable NDE sensor technologies developed over the past several decades.

This paper discusses new developments in sensor technology for Full-field Imaging Vibrometry at AS&T Inc. These sensors are capable of extended field measurement of structural dynamics at bandwidths extending from near DC to ultrasonic [1]. As compared to manual deployment of spatially distributed ...


Assessment Of Reflective Tapes On The Accuracy Of Displacement Measurement In Laser Doppler-Vibrometry, Mostafa Hasanian, Cliff J. Lissenden Jan 2016

Assessment Of Reflective Tapes On The Accuracy Of Displacement Measurement In Laser Doppler-Vibrometry, Mostafa Hasanian, Cliff J. Lissenden

Review of Progress in Quantitative Nondestructive Evaluation

Laser Doppler Vibrometry, LDV, is known to be a useful tool for measuring vibration and wave propagation for Non-destructive testing (NDT). Although LDV systems have many advantages, most notably they provide non-contact measurements, they often require surface enhancement [1, 2]. In order to improve the signal-to-noise ratio, reflective tapes are commonly used as a surface enhancement method in LDV applications. While accurate for low frequencies, measured displacements are not reliable once the frequency exceeds a threshold value. In this study, different tapes are mounted on the surface of an aluminum block, and out-of-plane displacements are recorded for frequencies from 0 ...


Characterization Of Delayed Ettringite Formation Using Nonlinear Impact Resonance Spectroscopy Method, Mehdi Rashidi, Alvaro Paul, Jin-Yeon Kim, Laurence J. Jacobs, Kimberly E. Kurtis Jan 2016

Characterization Of Delayed Ettringite Formation Using Nonlinear Impact Resonance Spectroscopy Method, Mehdi Rashidi, Alvaro Paul, Jin-Yeon Kim, Laurence J. Jacobs, Kimberly E. Kurtis

Review of Progress in Quantitative Nondestructive Evaluation

A nondestructive acoustic approach for the detection and quantification of damage in mortars affected by delayed ettringite formation (DEF) is used to study the degradation mechanism at micro- and macro-scales. The presentation considers a linear acoustic technique, dynamic elastic modulus, which measures the macro-scale damage, and a nonlinear acoustic technique, Nonlinear Impact ResonanceAcoustic Spectroscopy (NIRAS), which assesses the damage at the micro-scale. Both methods successfully differentiate the degree of DEF-damage in mortars experiencing various expansion levels. Variable Pressure Scanning Electron Microscopy (VP-SEM) images and Energy Dispersive X-Ray Spectroscopy (EDS) microanalysis are used to confirm the microstructural distress caused by DEF ...


Spray-On Transducers For High-Temperature Applications, Kenneth R. Ledford, Leland Tien, Janet L. Xu, Bernhard R. Tittmann Jan 2016

Spray-On Transducers For High-Temperature Applications, Kenneth R. Ledford, Leland Tien, Janet L. Xu, Bernhard R. Tittmann

Review of Progress in Quantitative Nondestructive Evaluation

Monitoring the structural health of large valve bodies in high-temperature environments such as power plants faces several limitations: commercial transducers are not rated for such high-temperatures, gel couplants will evaporate, and measurements cannot be made in-situ. To solve this, we have furthered the work of Barrow and Kobayashi in applying a transducer in liquid form by making it more field-deployable; the sintering step is removed, the fabrication time is reduced, and the signal-to-noise ratio is improved using post-processing techniques. Bismuth Titanate (BiT) was used as the piezoelectric material for its high Curie temperature, and three separate chemical binders were demonstrated ...


Dual-Wavelength Interdigital Capacitive Sensor For Dielectric Material Detection, Yunzhi Huang, Zheng Zhan Jan 2016

Dual-Wavelength Interdigital Capacitive Sensor For Dielectric Material Detection, Yunzhi Huang, Zheng Zhan

Review of Progress in Quantitative Nondestructive Evaluation

Interdigital capacitive sensors are widely used for non-destructive measurement of dielectric material properties in industry, with the advantages of one-sided inspection, adjustable signal strength and tomography capability. The dual-wavelength interdigital capacitive sensor has dual penetration depth, can be used for inspection material properties at different depths from the surface (Figure 1). In order to improve the imaging quality of capacitive sensor systems and enhance the inspection accuracy, the structure parameters optimization of the sensor and the edge-detection algorithm is studied. An analysis of how the sensor unit parameters affect the performances, such as the sensitive field distribution, sensitivity, and signal ...


Particle Filtering Based Structural Assessment With Acoustic Emission Sensing, Wuzhao Yan, Marwa Abdelrahman, Bin Zhang, Paul Ziehl Jan 2016

Particle Filtering Based Structural Assessment With Acoustic Emission Sensing, Wuzhao Yan, Marwa Abdelrahman, Bin Zhang, Paul Ziehl

Review of Progress in Quantitative Nondestructive Evaluation

Nuclear structures are designed to withstand severe loading events under various stresses. Over time, aging of structural systems constructed with concrete and steel will occur due to corrosion of reinforcement [1], alkali-silica reaction [2], and other mechanisms. This deterioration of structural integrity, if not detected in time, may reduce service life of nuclear facilities and/or lead to unnecessary or untimely repairs. For this reason, online monitoring of structures in nuclear power plants and waste storage has drawn significant attention in recent years [3]. Of many existing non-destructive evaluation (NDE) approaches, acoustic emission is promising for assessment of structural damage ...


Focused Ultrasonic Beam Behavior At A Stress-Free Boundary And Applicability For Measuring Nonlinearity Parameter In A Reflection Mode, Hyunjo Jeong, Shuzeng Zhang, Jongboem Kim, Xiongbing Li Jan 2016

Focused Ultrasonic Beam Behavior At A Stress-Free Boundary And Applicability For Measuring Nonlinearity Parameter In A Reflection Mode, Hyunjo Jeong, Shuzeng Zhang, Jongboem Kim, Xiongbing Li

Review of Progress in Quantitative Nondestructive Evaluation

Measurements of the acoustic nonlinearity parameter β are frequently made for early detection of damage in various materials. The practical implementation of the measurement technique has been limited to the through-transmission setup for determining the nonlinearity parameter of the second harmonic wave. For the purpose of practical applications, a pulse-echo measurement technique is more desirable which enables the single-side access of test components. The issue with using the second harmonic wave reflected from the stress-free interface is that such a boundary destructively alters the nonlinear generation process and consequently makes it difficult to obtain the reliable results of β.

In ...


Measurement Method Of Absolute Ultrasonic Nonlinearity Excluding System Nonlinearity Of Pulser, Jongbeom Kim, Dong-Gi Song, Hong-Pil Ha, Kyung-Young Jhang Jan 2016

Measurement Method Of Absolute Ultrasonic Nonlinearity Excluding System Nonlinearity Of Pulser, Jongbeom Kim, Dong-Gi Song, Hong-Pil Ha, Kyung-Young Jhang

Review of Progress in Quantitative Nondestructive Evaluation

The ultrasonic nonlinear parameter 𝛽𝛽 is used to quantify nonlinearity, which is measured from the displacement amplitudes of the fundamental and second-order harmonic frequency components. A few techniques have been designed to measure the ultrasonic nonlinear parameter 𝛽𝛽 such as capacitive detection method, laser interferometer method, and piezo-electric method. Among them, the piezo-electric method developed by G.E. Dace [1] is more commonly used than the other methods, because this method has advantages that equipment of conventional ultrasonic nondestructive testing (NDT) can be used, the signal-to-noise ratio is relatively high, and the measurement result is less affected by surface roughness ...


Further Development Of Image Processing Algorithms To Improve Detectability Of Defects In Sonic Ir Nde, Omar Obeidat, Qiuye Yu, Xiaoyan Han Jan 2016

Further Development Of Image Processing Algorithms To Improve Detectability Of Defects In Sonic Ir Nde, Omar Obeidat, Qiuye Yu, Xiaoyan Han

Review of Progress in Quantitative Nondestructive Evaluation

Sonic Infrared Imaging (SIR) technology is a relatively new NDE technique that has received significant acceptance in the NDE community. SIR NDE is a super-fast, wide range NDE method. The technology uses short pulses of ultrasonic excitation together with infrared imaging to detect defects in the structures under inspection. Defects become visible to the IR camera when the temperature in the crack vicinity increases due to various heating mechanisms in the specimen. Defect detection is highly affected by noise levels as well as mode patterns in the image. Mode patterns result from the superposition of sonic waves interfering within the ...


The Application Of Water Coupled Nonlinear Ultrasonics To Quantify The Dislocation Density In Aluminum 1100, A. Mostavi, N. Tehrani, N. Kamali, S. W. Chi, E. Indacochea, D. Ozevin Jan 2016

The Application Of Water Coupled Nonlinear Ultrasonics To Quantify The Dislocation Density In Aluminum 1100, A. Mostavi, N. Tehrani, N. Kamali, S. W. Chi, E. Indacochea, D. Ozevin

Review of Progress in Quantitative Nondestructive Evaluation

This article investigates water coupled nonlinear ultrasonic testing to characterize dislocation density in Aluminum 1100 specimens. The different levels of dislocation densities are introduced to the samples by applying different levels of plastic strain at tensile loading. The ultrasonic testing includes 2.25 MHz transducer as transmitter and 5.0 MHz transducer as receiver in an immersion tank. In order to reduce the error introduced by Fourier Transform to obtain the amplitudes of the first and second harmonics, Wavelet Transform is applied to the transient data, and the wave amplitudes are identified after the wave is decomposed into its harmonics ...


Limited View Guided Wave Tomography Based On Full Waveform Inversion, Jing Rao, Madis Ratassepp, Zheng Fan Jan 2016

Limited View Guided Wave Tomography Based On Full Waveform Inversion, Jing Rao, Madis Ratassepp, Zheng Fan

Review of Progress in Quantitative Nondestructive Evaluation

Guided wave tomography offers good potential to estimate the remnant thicknesses of corrosion patches without scanning an ultrasonic transducer along the surface. It uses the dispersion characteristics of guided waves, and reconstructs the thickness map by the inversion of ultrasonic signals captured by a transducer array around the inspection area. A guided wave tomography method based on full waveform inversion (FWI) was developed for the corrosion mapping, which uses a numerical forward model to predict the scattering of guided wave through corrosion defects, and an iterative inverse model to reconstruct the corrosion profile.

In this study, the FWI method is ...


Feasibility And Reliability Of Grain Noise Suppression In Monitoring Highly Scattering Materials Using Baseline Subtraction, Yuan Liu, Chang Liu, Peter Cawley Jan 2016

Feasibility And Reliability Of Grain Noise Suppression In Monitoring Highly Scattering Materials Using Baseline Subtraction, Yuan Liu, Chang Liu, Peter Cawley

Review of Progress in Quantitative Nondestructive Evaluation

This paper studies the feasibility and reliability of using the baseline subtraction method [1] to suppress grain noise in monitoring highly scattering materials. Monitoring is usually done with permanently installed sensors but this is not always possible and here we investigate the feasibility of subtracting A-scans extracted from repeat C-scans. It is important that the transducer standoff and angle relative to the testpiece are set consistently in the repeat scans and the influence of errors in these settings has been investigated. The successive C-scans can be registered by cross correlation and the effect of errors in the registration is illustrated ...


Magnetostrictive Transducers (Mst) Utilizing Reversed Wiedemann Effect, S. Vinogradov, A. Cobb, G. Light Jan 2016

Magnetostrictive Transducers (Mst) Utilizing Reversed Wiedemann Effect, S. Vinogradov, A. Cobb, G. Light

Review of Progress in Quantitative Nondestructive Evaluation

Magnetostrictive transduction has been widely utilized in NDE applications and, specifically, for generation and reception of guided waves for long-range inspection of components such as pipes, vessels, and small tubes. Transverse-motion guided wave modes (e.g., torsional vibrations in pipes) are the most typical choice for long-range inspection applications because the wave motion is in the plane of the structure. Magnetostrictive-based sensors have been available for the last several years for these wave modes based on the Wiedemann effect. For these sensors, a permanent magnetic bias is applied that is perpendicular to the direction of the propagated guided wave. This ...


Characterization Of Complex Defects Using Eddy Currents With Uniform Field Probes And Giant Magneto-Resistor (Gmr) Detectors, Dario Pasadas, A. Lopes Ribeiro, H. G. Ramos, T. Rocha Jan 2016

Characterization Of Complex Defects Using Eddy Currents With Uniform Field Probes And Giant Magneto-Resistor (Gmr) Detectors, Dario Pasadas, A. Lopes Ribeiro, H. G. Ramos, T. Rocha

Review of Progress in Quantitative Nondestructive Evaluation

Some defects in metallic plates present complex forms that difficult their geometric characterization. This is the case of defects with ramifications where the eddy currents cannot penetrate some concavity areas. The illumination of the material under test with a coherent excitation field presents some advantages, such as the possibility of applying the excitation into different directions, thus obtaining different patterns that may be correlated to increase the definition of the acquired signals. The generation of the coherent excitation is obtained by using a planar coil that produces a uniform excitation field inside a given area.

It is not easy to ...


Detection Of Manufacturing Defects Via Wavefield Image Processing Techniques: An Experimental Study, Peter D. Juarez, Cara A. C. Leckey Jan 2016

Detection Of Manufacturing Defects Via Wavefield Image Processing Techniques: An Experimental Study, Peter D. Juarez, Cara A. C. Leckey

Review of Progress in Quantitative Nondestructive Evaluation

Defects that occur during the manufacturing of a composite can have drastic effects on the intended strength or durability of composite structures. These defects include gaps and overlaps in the prepreg tow-tape that can occur during Automated Fiber Placement (AFP) system operations, as well as unintended fiber waviness caused by differential thermal loading during curing cycles. Wavefield imaging offers a non-contact method of detecting various anomalies in composites, and emerging technologies can enable rapid wavefield acquisition. In this work, composite samples were created with intentional and analogous manufacturing defects such as the ones mentioned, and full guided wavefield data was ...


Integration Of Structural Health Monitoring (Shm) Solutions Onto Commercial Aircraft Via The Faa Shm Research Program, Paul Swindell, Jonathon Doyle, Dennis Roach Jan 2016

Integration Of Structural Health Monitoring (Shm) Solutions Onto Commercial Aircraft Via The Faa Shm Research Program, Paul Swindell, Jonathon Doyle, Dennis Roach

Review of Progress in Quantitative Nondestructive Evaluation

The Federal Aviation Administration (FAA) started a research program in structural health monitoring (SHM) in 2011. The program’s goal was to understand the technical gaps of implementing SHM on commercial aircraft and the potential effects on FAA regulations and guidance. The program evolved into a demonstration program consisting of a team from Sandia National Labs Airworthiness Assurance NDI Center (AANC), the Boeing Corporation, Delta Air Lines, Structural Monitoring Systems (SMS), Anodyne Electronics Manufacturing Corp (AEM) and the FAA. This paper will discuss the program from the selection of the inspection problem, the SHM system (Comparative Vacuum Monitoring-CVM) that was ...


Results Of The 2016 Ut Modeling Benchmark Obtained With Models Implemented In Civa, Gwénaël Toullelan, Raphaële Raillon, Steve Mahaut, Sylvain Chatillon, Sébastien Lonne Jan 2016

Results Of The 2016 Ut Modeling Benchmark Obtained With Models Implemented In Civa, Gwénaël Toullelan, Raphaële Raillon, Steve Mahaut, Sylvain Chatillon, Sébastien Lonne

Review of Progress in Quantitative Nondestructive Evaluation

For several years, the World Federation of NDE Centers, WFNDEC, proposes benchmark studies in which simulated results (in either ultrasonic, X-rays or eddy current NDT configurations) obtained with various models are compared to experiments. This year the proposed UT benchmark concerns inspection configurations with multi-skips echoes. This technique is commonly used to inspect thin specimen and/or in case of limited access inspection. This technique relies on the use of T45° mode in order to avoid mode conversion and to facilitate the interpretation of the echoes. To evaluate the influence of the beam divergence on the detectability after several skips ...


Non-Destructive Testing Of 3d-Hybrid Components Using Air-Coupled Ultrasound, Wolfgang Adebahr, Marc Kreutzbruck Jan 2016

Non-Destructive Testing Of 3d-Hybrid Components Using Air-Coupled Ultrasound, Wolfgang Adebahr, Marc Kreutzbruck

Review of Progress in Quantitative Nondestructive Evaluation

The increasing use of hybrid lightweight structures in the automotive industry brings new challenges in the area of multi-material boundaries. Insufficient bonding quality between two kinds of materials, especially in highly loaded structures, affects the component’s performance. Hence, it is very important to monitor the bonding quality in multi-material structures. Flat specimen, consisting of sheet steel and organic sheet layers were examined using air- coupled ultrasound transducers in reflection setup. By slanted incidence of the ultrasound on the profile’s surface, guided waves were excited in the specimen and delaminated areas could be visualized due to changed phase values ...


Thermal Diffusivity Measurements On Porous Carbon Fiber Reinforced Polymer Tubes, Juergen Gruber, Guenther Mayr, Karl Heinz Gresslehner, Harald Katzinger Jan 2016

Thermal Diffusivity Measurements On Porous Carbon Fiber Reinforced Polymer Tubes, Juergen Gruber, Guenther Mayr, Karl Heinz Gresslehner, Harald Katzinger

Review of Progress in Quantitative Nondestructive Evaluation

Porosity in carbon fiber reinforced polymers (CFRP) degrades the mechanical resilience especially the interlaminar shear strength of structural components. Hence, a porosity level lower than 2.5% has to be ensured in a majority of the cases.

Former studies have shown the capability of Active Thermography for the determination of porosity in CFRP [1]. Especially, thermal diffusivity imaging shows a great potential for the detection of material inhomogeneities like porosity. For a model-based prediction of the porosity the quantitative evaluation of the effective thermal diffusivity is crucial [2]. To determine the thermal diffusivity common evaluation methods like the Thermographic Signal ...


Finite Element Representation Of Focused Angle Beam Ultrasonic Wave Field In 3d Space, Shaun Freed, Robert Banks, James L. Blackshire Jan 2016

Finite Element Representation Of Focused Angle Beam Ultrasonic Wave Field In 3d Space, Shaun Freed, Robert Banks, James L. Blackshire

Review of Progress in Quantitative Nondestructive Evaluation

Modeling ultrasonic wave interactions within complex material structures often requires finite element methods. There is increasing interest and available resources for modeling three dimensional problems when the out of plane motion and influences are significant. Often the primary goal is to investigate wave interactions within a material structure or part definition, and wave excitation details are only of secondary importance. However, immersion ultrasound is often conducted with focused probes and at non-normal incident angles. This provides a challenge for modeling efforts due to non-planar wave fronts and complex mode conversion characteristics along the interface. Adding the full probe and water ...